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Review

Effects of Exercise on the Resting Heart Rate: A Systematic Review and Meta-Analysis of Interventional Studies

by
Anne Kerstin Reimers
1,*,
Guido Knapp
2 and
Carl-Detlev Reimers
3
1
Faculty of Behavioral and Social Sciences, Institute of Human Movement Science and Health, Technical University of Chemnitz, Straße der Nationen 62, D-09111 Chemnitz, Germany
2
Department of Statistics, TU Dortmund University, Vogelpothsweg 87, D-44227 Dortmund, Germany
3
Paracelsus-Klinik Bremen, In der Vahr 65, D-28329 Bremen, Germany
*
Author to whom correspondence should be addressed.
J. Clin. Med. 2018, 7(12), 503; https://doi.org/10.3390/jcm7120503
Submission received: 8 November 2018 / Revised: 23 November 2018 / Accepted: 27 November 2018 / Published: 1 December 2018
(This article belongs to the Section Epidemiology & Public Health)
Browse Figure
Versions Notes

Abstract

:
Resting heart rate (RHR) is positively related with mortality. Regular exercise causes a reduction in RHR. The aim of the systematic review was to assess whether regular exercise or sports have an impact on the RHR in healthy subjects by taking different types of sports into account. A systematic literature research was conducted in six databases for the identification of controlled trials dealing with the effects of exercise or sports on the RHR in healthy subjects was performed. The studies were summarized by meta-analyses. The literature search analyzed 191 studies presenting 215 samples fitting the eligibility criteria. 121 trials examined the effects of endurance training, 43 strength training, 15 combined endurance and strength training, 5 additional school sport programs. 21 yoga, 5 tai chi, 3 qigong, and 2 unspecified types of sports. All types of sports decreased the RHR. However, only endurance training and yoga significantly decreased the RHR in both sexes. The exercise-induced decreases of RHR were positively related with the pre-interventional RHR and negatively with the average age of the participants. From this, we can conclude that exercise—especially endurance training and yoga—decreases RHR. This effect may contribute to a reduction in all-cause mortality due to regular exercise or sports.

1. Introduction

A major goal in healthcare is to increase life expectancy and eminently improve healthy and happy aging by compressing morbidity into a shorter period in a later stage of the lifespan [1]. Life expectancy has increased rapidly during the last century and disability-adjusted life expectancy has been extending as well. Regular exercise and physical activity throughout a lifespan can improve life expectancy [2,3] and disability-adjusted life expectancy, as shown in many studies [4,5].
One possible mechanism explaining increases in life expectancy through exercise and physical activity might be the mediating effect of resting heart rate (RHR): possibly, regular exercise and/or physical activity cause a reduction in RHR [6,7,8], and RHR seems to be inversely related with life expectancy [9] and positively related with cardiovascular and all-cause mortality [10]. The relationship between RHR and life expectancy has been studied in mammals by Levine [11], who found a semi-logarithmic relationship in mammals and concluded that the total number of heartbeats per lifetime is remarkably constant. Furthermore, he calculated that the inverse relationship of RHR and life expectancy in mammalians could be expressed mathematically with on average 7.3 ± 5.6 × 108 heart beats per lifetime. Only humans fall out of the alignment and have reached a life expectancy of about 80 years [11]. This might be due to advances in science, medicine, and sociology. However, in humans, RHR also seems to be an indicator of mortality, which has been analyzed in some studies [9,12,13].
Thus, the examination of effects regular exercise and physical activity on RHR is of particular interest, and has been studied in previous systematic reviews: Cramer, Lauche, Haller, Steckhan, Michalsen, and Dobos [8] found a significant reduction in heart rate through yoga interventions in their systematic review of randomized controlled trials on effects of yoga on diverse cardiovascular risk factors. Their meta-analysis revealed a reduction in heart rate of 6.59 bpm in studies that compared yoga with no-treatment usual care, or any active treatment in healthy participants. In another meta-analysis encompassing 13 studies, Huang, Shi, Davis-Brezette, and Osness [6] concluded that endurance training causes RHR reductions of 8.4% in older individuals which were even higher in controlled clinical trials with a training length of more than 30 weeks. Furthermore, a decrease in heart rate at quiet condition was found after tai chi exercise in healthy adults as shown in the meta-analysis of Zheng, Li, Huang, Liu, Tao and Chen [7]. However, to the best of our knowledge, a comprehensive review and meta-analysis of the effects of regular physical exercise on the RHR in various sports and exercise and a comparison of the effects of different exercise and sports is still missing.
Thus, the aim of this systematic literature review was to calculate the effects of any regular sports and/or exercise on RHR of healthy subjects through meta-analysis by considering different types of sports and exercise and by considering differences between men and women.

2. Materials and Methods

The review was performed adopting the recommendations of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines [14].

2.1. Search Strategy

Six electronic databases were searched on 13 May 2018: Google Scholar (the first 500 citations ordered by relevance), LIVIVO (the search engine of the German Central Library of Medicine), PubMed, Scopus, Springer Link, and Web of Science. If available, the search term has been applied in the search field “all fields”, and the “in humans” filter has been used (if available). The search term applied was: “(resting heart rate or resting pulse rate or resting heart frequency or resting pulse frequency) and (sport or training or exercise or yoga or tai chi or qigong) and control*”.

2.2. Study Selection

Only three relevant journal articles presented titles including the search term “resting heart rate” (or synonyms of this term). Moreover, in many of the relevant articles, RHR was presented as a less important outcome instead of the primary outcome and has not been mentioned in the abstract or even as a keyword. Nevertheless, to ensure identification of relevant primary studies through the study selection process, both the title and the abstract—and additionally, if available, the keywords—were considered in the first step of the screening process. All relevant references that could not be conclusively excluded were kept for further screening.
Next, the abstracts of all articles (if available) were checked regarding the characteristics of the participants, study design, and the intervention program. If the abstract indicated that the study potentially fulfilled the eligibility criteria or did not provide sufficient information for decision-making, the full text of the article was screened in a third step. Afterwards, articles presenting (nearly) the same content regarding the participants and results have been judged as double publications.
Finally, the references cited in the former systematic reviews and meta-analysis on the topic at hand [6,7,8,15] as well as cited by two own meta-analyses focussing on the effects of sports interventions on the arterial blood pressure and/or lipids [16,17] were screened and considered for inclusion (additional records identified through these sources: n = 130; cf. Figure 1). The screening process has been conducted by one reviewer. If necessary, a second reviewer was consulted for deciding on eligibility of the reference.

2.3. Eligibility Criteria

The following eligibility criteria have been defined a priori to the study selection process. Only primary studies that fulfilled all of the eligibility criteria were included in the present systematic review.

2.3.1. Types of Studies

Only controlled trials (randomized or non-randomized) were considered, and the study had to be published as a peer-reviewed journal article written in English, German, French, Spanish, or Portuguese language. Additionally, if an English language abstract and RHR data presented in English in the full text article were available, the translation of the article was considered. Thus, one Japanese article [18] has been translated and could be included in the present review.

2.3.2. Types of Participants

Studies with individuals being pregnant or having diseases like diabetes mellitus, metabolic syndrome, or a limited physical mobility due to diseases (e.g., cardiac and musculoskeletal disorders) were excluded whereas studies with participants that were overweight, obese, or had arterial hypertension or dyslipidaemia were included. If the individuals in the study were regularly exercising at the beginning of the study, the study was not excluded due to this fact.

2.3.3. Types of Interventions

The intervention should have comprised any type of sports and/or exercise including aerobic and anaerobic (e.g., high intensity interval training), endurance (including ball and team sports) or strength training, school sports, yoga, qigong, or tai chi.

2.3.4. Types of Outcome Measures

For inclusion in the meta-analyses, the trials had to report the RHR before and after the intervention (pre/post-measurements), presenting the mean values plus scale parameters (standard deviation or standard error or the 95% confidence interval).

2.4. Data Management and Data Extraction

After checking the potentially relevant primary studies according to the eligibility criteria mentioned above, the articles were additionally checked for double publication. The following data was extracted from each primary study included in this systematic review: author(s); year of publication; number, gender, and age of the participants; type of sports/exercise; duration of the intervention; frequency of exercise sessions; method of RHR measurement; randomisation; blinding; RHR at the beginning and end of the interventional period in the intervention and control groups, resp.
In case of studies with more than two arms (one control group and more than one exercise group), those comparisons with the higher exercise intensity, duration or frequency, continuous (versus interval) and concentric (versus eccentric) strength training, land-based (versus aquatic) training, and jogging/running (versus soccer) were considered for the meta-analyses. Additionally, if both pre and post-menstrual or pre and post-menopausal RHR results were presented, the first ones were included in the meta-analyses.

2.5. Risk of Bias Assessment

The methodological quality of the studies included was evaluated by one reviewer by considering three aspects: (1) the mode of randomization of the study participants to the intervention and control groups, (2) possible blinding of the examiners, and (3) the mode of assessing RHR have been registered (Table 1).

2.6. Statistical Analyses

2.6.1. Statistical Methods for the Meta-Analyses

The meta-analysis was carried out using the meta and metafor packages in the freely-available statistical R software, version 3.4.4 [19]. Most studies reported mean and standard deviation or standard error of RHR before and after the intervention separately for intervention and control group. When confidence intervals for the mean or the mean difference were reported, we calculated the relevant standard errors. We chose the standardized mean difference (SMD) as the primary effect size. For both groups we firstly calculated the difference between the mean RHR after and before the intervention, and then calculated the difference of these differences between intervention and control group divided by an appropriate standard deviation—either the common standard deviation of the two groups or a suitable combination of both individual standard deviations. Consequently, negative values are in favor of the intervention group for reducing the mean RHR. The random-effects meta-analysis was used for combining the study-specific results. We report the classical meta-analysis confidence interval as well as the modified confidence interval proposed by Hartung and Knapp [20]. Two-sided p-values < 0.05 are considered as significant. We judge the heterogeneity with the homogeneity test statistics denoted by Cochran’s Q and Higgins–Thompson I2, a measure which judges the impact of heterogeneity.
Additionally, we calculated the meta-analytical mean values of the RHR before and after intervention, separately for both groups using random-effects meta-analysis approach. Finally, relative changes defined as (mean after intervention minus mean before intervention)/(mean before intervention) were combined in the random-effects meta-analysis model for both groups.

2.6.2. Additional Statistical Methods

The Bravais–Pearson correlation coefficients r between the age of the participants, number, and frequency of the sportive interventions, and the pre-interventional RHR of the training group have been calculated on the one hand and the extent of the change of the RHR due to physical activity on the other. Two-sided p-values of <0.05 were considered as significant.

3. Results

3.1. Studies, Participants, and Exercise

Initially based on database queries and through screening of additional sources 15,992 articles have been identified and included in the screening process. After exclusion of 660 duplicates, 15,332 articles have been screened. Finally, the literature search yielded 191 studies meeting the eligibility criteria. Ten of these articles presented the same data as presented in another article and therefore were excluded. Thus, finally the data of 181 articles encompassing 215 samples were included in the meta-analytical synthesis. The selection process of the articles included in this systematic review is presented in Figure 1 and detailed descriptions of the 215 samples included in the meta-analysis are presented in Table 1.
All studies included have been published between 1971 and 2018. Altogether, 12,952 individuals were incorporated in the intervention (nI = 6763) and control groups (nC = 6189). The sample sizes of these groups ranged from 5 to 1456 within the studies with a median sample size of 17 participants (interquartile range, 12 to 26.5 participants). Of the 215 comparisons 92 included both female and male participants, whereas 65 only included females and 58 only males. Wiley et al. [21] did not report the gender of their participants (denoted as ‘human subjects’ only). This study was considered in the group of studies including both sexes.
Of the 191 studies presenting 215 samples, 121 looked into the effects of endurance training, 43 strength training, 15 combined endurance and strength training, and 5 additional school sports. The interventions included the following sports types: 21 yoga, 5 tai chi, 3 qigong, and 2 unspecified sport types. The exercise interventions lasted between 2 weeks and 2 years (median value, 12 weeks, interquartile range, 8 to 16.75 weeks). The participants exercised 0.8 to 7 times per week (median value, 3 times, interquartile range, 3 to 3.6 times per week). Altogether, they completed between 7 and 312 exercise sessions (median value, 36 sessions, interquartile range, 24 to 54 sessions) during their participation in the intervention studies.

3.2. Effects of Exercise on RHR by Considering Different Types of Sports/Exercise

The mean baseline and post-interventional RHR according to the different forms of sports and/or exercise are presented in Table 2. Under consideration of all comparisons, the RHR significantly decreased more in the exercising groups (intervention groups) compared to the control groups (all studies: −4.7% and −3.3 bpm resp., females only: −4.8% and −3.4 bpm, resp., males only: −6.4% and −4.3 bpm, resp., studies including both females and males: −3.6% and −2.6 bpm, resp.). The meta-analyses on specific types of sports and exercise also revealed significant higher decreases in RHR in the intervention compared to the corresponding control groups for endurance training (all groups), yoga (females and males only), strength training (females only), and combined endurance and strength training (females only, not Hartung-Knapp CI).

3.3. Additional Analyses

The extents of decrease of the RHR due to the interventions were significantly associated with the initial RHR (all studies: r = 0.30, n = 215, p < 0.001; women: r = 0.28, n = 65, p = 0.024; men: r = 0.22, n = 59, p = 0.09; both sexes: r = 0.39, n = 91, p < 0.001). The average age of the study participants was not related with the baseline RHR of the participants (r = −0.14, n = 194, p = 0.052; 21 trials did not mention the mean age of the participants), but with the sport/exercise-induced decrease of the RHR (r = 0.15, n = 194, p = 0.037). The higher the average age the smaller was the decrease of the RHR. The average age of the exercising participants was not significantly associated with the number of training sessions throughout the intervention (r = 0.133, n = 194, p = 0.064). The number of exercise sessions throughout the interventions did not significantly influence the changes in the RHR (r = 0.088, n = 215, p = 0.20).

3.4. Risk of Bias in Individual Studies

The characteristics of the samples and the results of the risk of bias assessment included in the present review are shown in Table 1. In 178 (82.8%) samples, the participants were randomly assigned to the exercising and control groups with 10 articles presenting detailed information about the mode of randomization. Nine (4.2%) samples were based on non-randomized collectives. In the remaining 27 (12.6%) samples, no information about randomization was given.
In only two studies [86,161], the researchers were blinded regarding the assignment of the participants to the intervention and control group.
In 153 (71.2%) samples, the method used for measuring the RHR was described: conventional or long-term electrocardiography or sport tester heart rate monitors (n = 111), automatic sphygmomanometer (n = 25), auscultation (n = 8), pulse monitor (n = 4), palpation (n = 3), oscillometer (n = 1), and oximeter (n = 1). 62 studies gave no information regarding the measurement methods of the RHR.

4. Discussion

4.1. General Discussion of Findings

The present meta-analysis is the first determining the effects of any regular physical activity, exercise, or sports on RHR of healthy people by considering different types of sports and exercise as well as differences between males and females. The literature search in six data bases and additional sources revealed a total of 191 primary studies suitable for inclusion that overall encompassed 215 samples, resulting in a comprehensive evaluation of existing studies on the effects of sports and exercise on RHR in males and females.

4.2. Effects of Different Types of Sports on RHR

In the meta-analysis of 16 trials by Huang et al. [6], the magnitude of net change of RHR due to endurance training in older adults averaged 6.16 ± 0.97 bpm, representing a mean reduction of 8.4%. The mean effect of yoga identified in the meta-analysis of nine trials by Cramer et al. [8] was very similar (M: −6.59 bpm, 95%-CI: −12.89 to −0.28 bmp). This meta-analysis included both healthy and diseased participants. Zou et al. [15] combined four trials and described a significant decrease of the RHR due to qigong (SMD: −0.87, no absolute difference of RHR presented). Tai chi exercise reduced the RHR by 0.72 (SMD: Cl = −1.27 to −0.18, n = 6 trials) [7].
Our meta-analyses indicate that endurance training as well as yoga decrease the RHR. After endurance training, the mean decrease of RHR of the exercising participants as compared to the non-exercising was depending on the sexes of the participants (4.5% to 9.0% and 2.7 to 5.8 bpm, resp.). These results are a little bit smaller than those found by Huang et al. [6] who meta-analytically combined 13 studies with a total of 410 exercising individuals. Their overall net change in RHR amounted to −6.16 ± 0.97 bpm (M ± SE, 95%-CI: −8.15 to −4.18, p < 0.001). Our results on effects occurring after a yoga program indicate a mean decrease of the RHR due to the exercise (4.1% to 5.5% and −5.2 to −5.5 bpm, resp.). However, the reduction found in our study was slightly smaller than that found by Cramer et al. [8] in controlled clinical trials (M = −6.59 bpm, 95%-CI: −12.89 to −0.28 bpm). The results of Zheng et al. [7], indicating a significant decrease of RHR due to tai chi could not be confirmed in the present meta-analysis. However, in contrast to our approach, the authors included only two randomized controlled trials, eight non-randomized controlled trials, three self-controlled trials, and seven cohort studies. Thus, the basis of their meta-analysis differed considerably with the present one.
The meta-analysis of the five RCTs on strength training included in our review did not yield significant effects: our results indicate that strength training has no significant impact on the RHR. Nevertheless, by stratification of sexes strength training (−5.0% and −2.2 bpm) and a combined endurance and strength training (−4.5% and −3.8 bpm) significantly decreased the RHR in females, but not in males.
All other sports types also resulted in a decrease of the RHR. However, the effects did not reach significance, due possibly to insufficient statistical power caused by too small sample sizes and/or only few available trials. The higher the initial RHR, the more the RHR decreased due to exercise. The effect occurs after only a few months—on average, three months with three training sessions per week. Furthermore, the participants´ age was negatively associated with the exercise-induced decrease of the RHR, although the elderly participants did not exercise less than their younger counterparts.

4.3. Possible Mechanisms of the Heart Rate-Decreasing Effect of Sports and Physical Activity

Bahrainy et al. [211] suggest that neither an increase in resting parasympathetic tone nor a decrease in response to beta-adrenergic stimulation contribute to the decrease in RHR after regular exercise or physical activity in humans. The effect may be due to a decrease in the intrinsic heart rate via mechanisms which have not yet been fully understood. In the case of yoga, lower RHR may also be caused by an enhanced parasympathetic output [212].

4.4. Possible Relevance of Exercise-Induced Reductions of the RHR for Mortality

Recently, Aune et al. [10] calculated that an increase of the RHR by 10 bpm increases all-cause mortality by 17%. The evidence regarding negative influence of elevated RHR on cardiovascular and thus all-cause death is constantly increasing. The mechanisms of this relationship are still not completely known. Possible mechanisms may be endothelial dysfunction, reduced artery compliance and distensibility, and consequently increased arterial wall stress and elevated pulsed wave velocity, which is further associated with increased after load and ultimately systemic hypertension [213]. However, the RHR does not fulfil all criteria for being an independent risk factor, as scientific evidence proving that treating an elevated RHR reduces mortality is still lacking [214]. Thus, it cannot be excluded that the relationship between the RHR and mortality may be non-causative. If there is a causative relationship assuming a persistently reduced RHR due to lifelong endurance—according to the results of our meta-analysis—exercise and yoga could reduce mortality by about 4.4% to 8.9% and about 6.0% to 8.7%, respectively, depending on the sex of the athlete.

4.5. Risk of Bias

The majority of studies randomly assigned the participants to the intervention and controls groups. It is possible that the percentage may be even considerably higher, since only nine studies have been declared as non-randomized, whereas the remaining 27 studies did not report on randomization. However, including non-randomized interventional studies in the analysis probably does not affect the results, since the RHR as an autonomic function is unlikely to be influenced by the participants wills.
In only two studies, the researcher was blinded regarding the assignment of the participants to the intervention or control group. Double blinded exercise and sport studies are difficult to perform. However, this could substantially influence the measurements of the RHR. Additionally, the accuracy of the RHR measurements might be lower for physical assessments (like palpation or auscultation) than for electrocardiography. Thus, the accuracy of measuring the RHR differs between the studies that used different methods. However, a systematic error due to different measurement methods applied in the included studies is rather unlikely, given that within each study the method did not change. Furthermore, the RHR is not a stable construct and may vary within short time periods. Consequently, the point in time the measurements were conducted could have influenced the identified values. Nevertheless, it is hardly imaginable that any systematic errors occurred which influenced only the training or only the control group.
In the excluded studies, outcome reporting bias and publication bias may exist: for example, several studies examining the relationship between physical activity and/or sport and health-related outcomes probably involved and measured RHR but did not report the results. However, as in the studies included in the present meta-analysis, only in one study was RHR the primary outcome [204]—hence we assume that non-reporting of RHR does not distort our results for RHR.
Only studies presenting complete outcome parameters (RHR before and after the intervention as well as scattering data) were included in the meta-analysis. Several studies do not present the mean or median age of their participants as well as the corresponding scattering data. Lacking detailed information on the participants´ ages and gender as in the study of Wiley et al. [21] also do not affect the effect of training on the RHR.

4.6. Strength and Limitations

A strength of this systematic review and meta-analysis is the systematic search of primary studies employing six search engines and encompasses more than 200 samples. Additionally, types of sports and exercise performed in the intervention were considered to enable the identification of sport-specific effects on RHR. However, this meta-analysis also consists of several limitations. First, the duration and frequency of the sports and exercise conducted during the intervention programs varied considerably—even when summarizing interventions of the same types of sports. Second, the effects of the different types of sport and exercise (endurance or strength training, Asian sports activities) cannot be compared to each other due to different physiological effects. Thus, the results of our analysis only showed if the different types of sports and exercise had an impact on the RHR or not. Third, the number of studies examining school sports, tai chi, and qigong was too low to draw final conclusions, resulting in the impossibility of calculating the effects associated with these activities.

5. Conclusions

Our meta-analyses indicate that both endurance sports as well as yoga decrease the RHR. These types of sports activities—after exclusion of otherwise treatable disease such as anemia, cardiac or endocrine disorders (e.g., hyperthyroidism)—could be used as a treatment in case of unfavorable high RHRs. The positive correlation between the RHR-decreasing effect and the initial RHR indicates that this therapeutic approach could be especially interesting in case of tachycardia. However, further studies are needed focusing on effects of Tai Chi and Qigong which have only been considered in a few studies. Furthermore, future studies could use shorter time intervals between measurements of RHR to get insights into the underlying processes, contributing to the reductions in RHR.
In summary, exercise-related decrease of RHR may contribute to—or at least indicate—increasing life expectancy. However, this has not been investigated in the current meta-analysis and should therefore be a topic of further studies.

Author Contributions

A.K.R. contributed to the design of the study and drafted the manuscript. G.K. performed the meta-analyses and provided edits to the manuscript. C.-D.R. performed the database searches, screening process, data extraction, and provided edits to the manuscript. All authors approved the final version of the manuscript.

Funding

This research was funded by Chemnitz University of Technology in cooperation with the German Research Foundation/DFG grant number 392676956.

Acknowledgments

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

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Jcm 07 00503 g001 550
Figure 1. Flow chart of the screening and selection process for the identification of studies for inclusion in the present systematic review according to PRISMA (Moher et al. [14]).
Figure 1. Flow chart of the screening and selection process for the identification of studies for inclusion in the present systematic review according to PRISMA (Moher et al. [14]).
Jcm 07 00503 g001
Table
Table 1. Descriptive characteristics of the samples included in the meta-analyses.
Table 1. Descriptive characteristics of the samples included in the meta-analyses.
Author(s)SexN (IG)Age * (yr)Exercise in the IGMeasurement of RHRRandomizationBlindingIGCGRel. RHR Change IG/CG (%)
Duration (/wk)FreQuency (/wk)Overall Number of UnitsBaseline RHR (/min)Final RHR (/min)Baseline RHR (/min)Final RHR (/min)
Endurance training
Abadi et al. [22]♀ + ♂2522.612336ECGrandomn.p.73.9672.4473.8873.72−1.8
Akinpelu [23]♂1055.710440n.p.n.p.n.p.7372.881.878.63.8
Akwa et al. [24]♀861.258324ASPrandomn.p.76.5728378.5−0.5
Andersen et al. [25]♂1346.717234ASPrandomn.p.79677273−16.4
Anek & Bunyaratavej [26]♀2650.674312n.p.randomn.p.79.2675.8579.3379.53−4.5
Anek et al. [27]♀1539.8616348ASPrandomn.p.78.2676.879.1379.56−2.4
Apekey et al. [28]♀ + ♂1218–388216ECGrandomn.p.857883760.2
Aweto et al. [29]♀ + ♂2344.1428auscultationrandomn.p.77.270.975.473.1−5.3
Baker et al. [30,31]♀ + ♂3947.312336ASPIVRSn.p.68.669.567.968.9−0.2
Beck et al. [32,33]♀ + ♂920.18324n.p.randomn.p.64566058−9.5
Blum et al. [34]♀2132.812448n.p.not randomn.p.80.171.469.372.4−14.7
Blumenthal et al. [35,36]♀ + ♂336717351ECGrandomn.p.74727069−1.3
Bocalini et al. [37]♀256412560ECGrandomn.p.90859089−4.5
Braith et al. [38]♀ + ♂146526378n.p.randomn.p.69636566−10.1
Boutcher & Stein [39]♂2546.28324ECGrandomn.p.71.367.973.177.3−10.0
Broman et al. [40]♀15698216ECGrandomn.p.78.772.269.471.1−10.5
Carroll et al. [41]♀ + ♂2968.426378ECGrandomn.p.63.461.86160.3−1.4
Ciolac et al. [42]♀1124.416348n.p.randomn.p.80777979−3.7
Connolly et al. [43]♀133916232ASPrandomn.p.77737774−1.4
Connolly et al. [44]♀154412336n.p.randomn.p.70656869−8.5
Cononie et al. [45]♀ + ♂11728324ECGn.p.n.p.66616867−6.2
Cononie et al. [45]♀ + ♂6728324ECGn.p.n.p.66626665−4.6
Davies & Daggett [46]♀829.28324n.p.n.p.n.p.64.964.879.376.43.6
Delecluse et al. [47]♂2064.5202.550ECGrandomn.p.78.268.973.373.9−12.6
Dowdy et al. [48]♀1831.510330n.p.non randomn.p.67.161.771.873.3−9.9
Duey et al. [49]♀1623.66318ECGn.p.n.p.80.777.17878−4.5
Duncan et al. [50]♂4430.416348ECGrandomn.p.73.765.274.373.8−10.9
Ewart et al. [51]♀44Adol.18n.p.n. c.ECGrandomn.p.79.779.283.883.8−0.6
Finucane et al. [52]♀ + ♂4871.412336ECGrandomn.p.6662.165.264.4−4.7
Geenen et al. [53]♀ + ♂386.88432ECGrandomn.p.848985847.2
Goldberg et al. [54]♂1520.54312ECGrandomn.p.69.46163.659.2−5.6
Gormley et al. [55]♀ + ♂13216318ECGrandomn.p.646567671.6
Gossard et al. [56]♂234912560ECGrandomn.p.68667474−2.9
Gutin et al. [57]♀ + ♂179.617585ECGrandomn.p.8177.58586.8−6.3
Hagberg et al. [58]♀ + ♂1164372.592.5n.p.randomn.p.73657576−12.1
Halbert et al. [59]♀ + ♂14967.3523156n.p.randomn.p.70.971.171.371.6−0.1
Hamdorf & Penhall [60]♀1882.426252ECGrandomn.p.74.471.872.775.4−7.0
Hamdorf et al. [61]♀2764.826252n.p.randomn.p.767476740.0
O’Hartaigh et al. [62]♀ + ♂21376.8523106n.p.randomn.p.69666866−1.4
Hespel et al. [63]♂1339.216348ECGrandomn.p.6558.26664.8−8.8
Hewitt et al. [64]♀ + ♂12418432ECGrandomn.p.6663.86765.3−0.8
Heydari et al. [65,66]♂2524.712336ECGrandomn.p.62.257.962.763.7−8.4
Heydari et al. [67]♂1724.412336ECGrandomn.p.67616970−10.3
Higashi et al. [68]♀ + ♂205312672n.p.randomn.p.71.868.873.169.21.2
Hill et al. [69]♀ + ♂876410.5442ECGn.p.n.p.85.0376.9479.1578.89−9.2
Hiruntrakul et al. [70,71]♂192112112n.p.randomn.p.88789093−14.2
Hornstrup et al. [72]♀1423.9121.720.4ASPrandomn.p.59576162−4.9
Jahromi et al. [73]♀3010–118324pulse monitorn.p.n.p.81.1272.3180.0580.26−11.1
Jurca et al. [74]♀49PMP83.528ECGrandomn.p.68.1656665.8−4.3
Karavirta et al. [75]♂2355.6717ECGrandomn.p.61575453−4.8
Karavirta et al. [76]♀2652717ECGrandomn.p.63606562−0.2
Kiens et al. [77]♂244012336ECGrandomn.p.69.459.364.960.7−8.6
Kim et al. [78]♂14176530n.p.randomn.p.75.170.476.376.2−6.1
Knoepfli-Lenzin et al. [79]♂1536122.530n.p.randomn.p.70617468−5.2
Kokkinos et al. [80]♂235716348n.p.randomn.p.73717375−5.3
Korshoj et al. [81,82]♀ + ♂5744.9522104ECGc.r.n.p.71.769.9870.570.3−2.1
Krustrup et al. [83]♂1220–43122.530ECGrandomn.p.59536061−11.6
Krustrup et al. [84]♀2137161.828ECGrandomn.p.62576363−8.1
Krustrup et al. [85]♀ + ♂469.4102.121ECGrandomn.p.70.469.970.671.2−1.5
Lamina [86]♂11258.638324ASPrandomdouble blind82.2570.7882.680.5−11.7
Linder et al. [87]♂2111–178432n.p.randomn.p.7274.869.775.7−4.3
Loimaala et al. [88]♂2646.8225110ECGrandomn.p.68646769−8.6
Mahdiabadi [89]♂1018.58324auscultationrandomn.p.68.266.271.368.31.3
Melanson & Freedson [90]♂1136.616348ECGnon randomn.p.64.959.86160.5−7.1
Menezes-Cabral et al. [91]♀5364.817468ECGn.p.n.p.75.271.677.678.7−6.1
Menezes-Cabral et al. [91]♂5164.517468ECGn.p.n.p.77.172.88787.9−6.5
Meucci et al. [92]♀ + ♂69.94520ECGrandomn.p.978010499−13.4
Miyai et al. [93]♂1746.612336ECGrandomn.p.68.55766.763−1.9
Mogharnesi et al. [94]♂1214.328324n.p.randomn.p.76.469.7574.675.6−9.9
Mohr et al. [95]♀2144152.943.5ASPrandomn.p.78737774−2.6
Molmen-Hansen et al. [96]♀ + ♂3152.512336oscillometerrandomn.p.7369.573.473.7−5.2
Moreau et al. [97]♀1553246144n.p.randomn.p.77757776−1.3
Morgan et al. [98]♀ + ♂1457.4157105ECGrandomn.p.75.6471.2171.672.13−6.5
Nakamura et al. [18]♀ + ♂822.68324ECGrandomn.p.78.773.47170−5.4
Nemoto et al. [99]♀316422488ECGrandomn.p.81787977−1.2
Nemoto et al. [99]♂116722488ECGrandomn.p.757480772.5
Norris et al. [100]♀ + ♂1416.710220n.p.n.p.n.p.78.8663.7175.3777.62−21.6
Nualnim et al. [101]♀ + ♂245812784ECGrandomn.p.62586359−0.1
Nybo et al. [102]♂83712224ECGn.p.n.p.55526061−7.0
Ortega et al. [103]♀ + ♂724.825.511ECGrandomn.p.69606260−10.1
Palmer [104]♀1637.48n.p.n.c.ASPrandomn.p.7472.27172.7−4.7
Patterson et al. [105]♀1434.98324ECGrandomn.p.74667272−10.8
Pollock et al. [106]♂1548.920480ECGn.p.n.p.6561.773.372.4−3.9
Pollock et al. [107]♂93820360ECGrandomn.p.67.3606865.9−8.0
Pollock et al. [108]♂225520360ECGn.p.n.p.62.956.167.665.6−8.1
Racil et al. [109]♀14.201712336ECGrandomn.p.70677070−4.3
Ray und Carter [110]♀ + ♂14258432ECGrandomn.p.66647675−1.7
Richter et al. [111]♂10459327ECGrandomn.p.7776.484821.6
Ruoti et al. [112]♀ + ♂126512336ECGrandomn.p.72.2167.1271.3272.32−8.3
Sakai et al. [113]♀ + ♂19564312ASPrandomn.p.74747576−1.3
Sakuragi u. Sugiama [114]♀819.44624ECGrandomn.p.65.561.26463.9−6.4
Schmidt et al. [115]♂96881.512ASPrandomn.p.64566159−9.5
Seals et al. [116]♀ + ♂106230.33.61098ECGn.p.n.p.68676266−7.4
Seals u. Reiling [117]♀ + ♂96363.621.6n.p.n.p.n.p.83827679−5.0
Serwe et al. [118]♀2037.18540n.p.randomn.p.68.468.672.772.90.0
Shiotani et al. [119]♀ + ♂16young adults9327ECGrandomn.p.73.769.57574.7−5.3
Silie et al. [120]♀1719.812560ECGrandomn.p.82.378.78281.8−4.1
Spalding et al. [121]♀ + ♂1522.26424ECGrandomn.p.72.771.575.575.5−1.7
Stefanick et al. [122]♀ + ♂4330–64523156n.p.randomn.p.6766.26768.1−2.8
Stefanick et al. [122]♀ + ♂4330–64523156n.p.randomn.p.6763.26765.4−3.4
Sugawara et al. [123]♀115984.536ECGrandomn.p.59.558.565.564.6
Suter et al. [124]♂3938.817468ECGrandomn.p.64.761.260.759.4−3.3
Tanabe et al. [125]♀ + ♂2150.910330n.p.n. an.p.75.773.269.170.6−5.4
Tanaka et al. [126]♀ + ♂116210330n.p.n. an.p.70686666−2.9
Tanaka et al. [127,128,129]♀ + ♂124710330palpationn. an.p.81717675−11.2
Tsai et al. [130,131]♀ + ♂1249.612336n.p.n.p.n.p.83.879.280.479.7−4.7
Tsai et al. [130,131]♀ + ♂2245.512336n.p.n.p.n.p.7982.884.891−2.3
Tsai et al. [132]♀ + ♂3748.810330n.p.randomn.p.76.874.676.678.8−5.6
Tully et al. [133]♀ + ♂4246.3712336ASPrandomn.p.7269.057573.9−2.7
Turner et al. [134]♀ + ♂1165.2304120n.p.n.p.n.p.63.457.86863−1.6
Urata et al. [135]♀ + ♂1051.410330n.p.randomn.p.7472.173.371.2.3
Vance et al. [136]♂19n.p.16n.p.n. c.n.p.n.p.n.p.76.7167.673.1876.05−5.2
Wanderley et al. [137]♀ + ♂2069.9343102ECGrandomn.p.67.564.168.465.5−0.8
Whitehurst & Menendez [138]♀18698324ECGn.p.n.p.72.968.372.973.3−6.8
Winter et al. [139]♀ + ♂243110330ECGENVn.p.75707977−4.2
Wolfe et al. [140]♀1219–2211444n.p.n.p.n.p.68686771−5.6
Wood et al. [141]♂4845.3524208ECGrandomn.p.66.657.471.168.7−10.8
Wood et al. [142]♀ + ♂1169.112336ECGn.p.n.p.67.862.264.164.8−9.3
Wynne et al. [143]♀1323.210330n.p.n.p.n.p.76687067−6.5
Yamamoto et al. [144]♂7216424ECGn.p.n.p.68.153.267.566.2−20.3
Yoshizawa et al. [145]♀124712224n.p.randomn.p.67596162−13.4
Combined endurance and strength training
Anek et al. [27]♀1540.2616348ECGrandomn.p.79.475.279.1379.56−5.8
Byrne u. Wilmore [146]♀1035.920360ECGrandomn.p.66.559.36362.2−9.7
Cortez-Cooper et al. [147]♀ + ♂125113226n.p.randomn.p.62596565−4.8
Delecluse et al. [47]♂1863.8202.550ECGrandomn.p.76.271.473.373.9−7.1
Deley et al. [148]♀ + ♂2477.2523156ECGrandomn.p.7375.574.370.19.6
Figueroa et al. [149]♀125412336ECGrandomn.p.66626867−4.7
Frye et al. [150]♀ + ♂2869.212336n.p.randomn.p.66.87068.767.96.0
Karavirta et al. [75]♂2955.621242ECGrandomn.p.585754530.1
Karavirta et al. [76]♀214921242ECGrandomn.p.626265624.8
Masroor et al. [151]♀1539.674520ECGrandomn.p.75.571.280.383.2−9.0
Ohkubo et al. [152]♀ + ♂2260–8125250ASPrandomn.p.62.660.266.264−0.5
Stewart et al. [153,154]♀ + ♂516326378ASPrandomn.p.69.865.971.969.7−2.6
Svendsen et al. [155]♀4853.812336n.p.randomn.p.73647469−6.0
Tsuda et al. [156]♂846.26212ECGrandomn.p.696872701.4
Wood et al. [142]♀ + ♂966.112336ECGn.p.n.p.79.873.764.164.8−8.6
Strength training
Badrov et al. [157]♀11278540ECGrandomn.p.646466651.5
Baross et al. [158]♂10558324ECGrandomn.p.71666968.2−6.0
Beck et al. [32,33]♀ + ♂1521.18324n.p.randomn.p.636160580.2
Byrne u. Wilmore [146]♀939.120480ECGrandomn.p.63.460.56362.2−3.3
Carter et al. [159]♀ + ♂12218324ECGnon randomn.p.65636167−11.8
Cononie et al. [45]♀ + ♂127226378ECGrandomn.p.616568678.1
Cononie et al. [45]♀ + ♂67226378ECGrandomn.p.656966657.8
Cortez-Cooper et al. [147]♀ + ♂135213339n.p.randomn.p.606165651.7
Fripp et al. [160]♂1415.29327n.p.n.p.n.p.767879792.6
Gelecek et al. [161]♀2454.3312336palpationrandomsingle blinded80.0878.4177.7680.47−5.4
Gerage et al. [162]♀1565.512336ECGrandomn.p.73.8671.8978.3781.14−6.0
Giannaki et al. [163]♂20168216ECGrandomn.p.78.877.676.878.5−3.7
Gorjao et al. [164]♀10668324ECGrandomn.p.75.777.476.674.74.8
Harris und Holly [165]♂1032.79327ECGrandomn.p.75.776.573.972.33.3
Ibrahim et al. [166]♂122112336ASPrandomn.p.71.771.272.972.6−0.3
Ibrahim et al. [166]♂102212336ASPrandomn.p.72.468.372.268.5−0.6
Kanegusuku et al. [167]♀ + ♂136316232ECGrandomn.p.838781788.9
Karavirta et al. [75]♂2555.621242ECGrandomn.p.595954531.9
Karavirta et al. [76]♀265221242ECGrandomn.p.626165623.1
Lovell et al. [168]♂1271.416348n.p.randomn.p.696868661.5
Marinda et al. [169]♀2566.128324n.p.randomn.p.68.873.262.4874.92−1.3
Menezes-Cabral et al. [91]♀5164.817468n.p.n.p.n.p.75.77277.678.7−6.2
Menezes-Cabral et al. [91]♂5364.517468n.p.n.p.n.p.82.677.18787.9−7.6
Millar et al. [170]♀ + ♂13658324ECGnon randomn.p.58566263−5.0
Miyachi et al. [171]♂142217351n.p.randomn.p.55545756−0.1
Mogharnesi et al. [94]♂1213.718324auscultationrandomn.p.76.570.3374.675.6−9.3
Nybo et al. [102]♂83612224ASPn.p.n.p.57566061−3.4
Okamoto et al. [172]♀1019.18324n.p.randomn.p.68.467.167.662.46.3
Okamoto et al. [173]♀ + ♂1318.510220n.p.randomn.p.666663621.6
Schmidt et al. [115]♂969.1121.922.8ASPrandomn.p.636161590.1
Shaw et al. [174]♀1960.446212auscultationrandomn.p.69.0563.871.2671−7.3
Spalding et al. [121]♀ + ♂1522.26424pulse monitorrandomn.p.72.97375.575.50.1
Stiller-Moldovan et al. [175]♀ + ♂11608324pulse monitorrandomn.p.71.37166.264.42.4
Taylor et al. [176]♀ + ♂969.310330ECGrandomn.p.70687076−10.5
Terra et al. [177]♀2066.812336ASPnon randomn.p.72.272.774.1740.8
Thomas et al. [178]♀ + ♂6569.112336ASPrandomn.p.676567650.0
Vinvent et al. [179]♀ + ♂2466.624372auscultationrandomn.p.82807784−10.6
Wanderley et al. [137]♀ + ♂1167.3343102ECGrandomn.p.62.260.368.465.51.2
Wiley et al. [21]n.p.1020–358324ECGrandomn.p.78767782−8.5
Wilmore et al. [180]♀12n.p.10330ECGrandomn.p.65.459.461.559.6−6.3
Wilmore et al. [180]♂16n.p.10330ECGrandomn.p.63.658.461.855.32.6
Wood et al. [142]♀ + ♂1069.812336ECGn.p.n.p.67.363.564.164.8−6.7
Yoshizawa et al. [145]♀114712224n.p.randomn.p.67636162−7.5
Unspecified sports activities
Edwards et al. [181]♀ + ♂2546.512560ECGrandomn.p.77.273.375.478.5−8.8
García-Ortiz et al. [182]♀ + ♂145651.47524208n.p.randomn.p.75.875.4275.2774.890.0
Additional school sports
Hansen et al. [183]♀179–118324ECGrandomn.p.91.885.996882.1
Nogueira et al. [184]♀7110.6353105auscultationrandomn.p.71.866.667.266−5.6
Rautela et al. [185]♀30n.p.6636ECGrandomn.p.80.980.7381.181−0.1
Walther et al. [186]♀ + ♂141111043312n.p.ENVn.p.10398.310298−0.7
Wong et al. [187]♂1213.7512224ECGrandomn.p.78717676−9.0
Qigong
Lee et al. [188]♀ + ♂2955.810330ASPrandomn.p.73.8272.2773.5576.2−5.5
Li et al. [189]♀ + ♂10120.6312560n.p.PLANn.p.83.6182.6180.4982.22−3.3
Sousa et al. [190]♀811.57749n.p.non randomn.p.107968186−15.5
Tai chi
Frye et al. [150]♀ + ♂2369.212336n.p.randomn.p.70.9570.7768.767.90.9
Logghe et al. [191]♀ + ♂13877.513226n.p.randomn.p.7168.370.667.80.2
Nguyen und Kruse [192]♀ + ♂4869.2326252n.p.randomn.p.84.4876.7283.0882.86−8.9
Thomas et al. [178]♀ + ♂6468.9523156ASPrandomn.p.70676765−1.3
Tsai et al. [193]♀ + ♂3751.612336ECGrandomn.p.77.875.878.276.6−0.5
Yoga
Bezerra et al. [194]♀1863.112336oximeterrandomn.p.76.3974.6177.2879.78−5.4
Blumenthal et al. [35,36]♀ + ♂326717234ECGrandomn.p.75707069−5.3
Cheema et al. [195]♀ + ♂183710330ECGrandomn.p.626568676.4
Cohen et al. [196]♀ + ♂4648.26318n.p.randomn.p.706869670.0
Hewett et al. [197]♀ + ♂2938.216464ECGrandomn.p.64.162.965.462.23.2
Kanojia et al. [198]♀2518.613678ECGrandomn.p.79.8472.9675.7281.92−15.5
Kim et al. [199]♀1645.76530pulse monitorrandomn.p.65.965.965.866.1−0.5
Krishna et al. [200]♀ + ♂4449.3412112ECGrandomn.p.96.3681.4896.3392.04−11.5
Lau et al. [201]♀5351.6412336ECGnon randomn.p.69.1166.8170.6171.39−4.4
Lau et al. [201]♂3453.6812336ECGnon randomn.p.67.5366.3266.7768.73−4.6
Madanmohan et al. [202]♀ + ♂2317–206636ASPn.p.n.p.70677573−1.7
McCaffrey et al. [203]♀ + ♂2756.78324n.p.randomn.p.85.5973.7480.8585.07−18.1
Mehrotra et al. [204]♀3618–2113791ECGnon randomn.p.86.8472.9781.6882.35−16.7
Mehrotra et al. [204]♂3618–2113791ECGnon randomn.p.77.0870.1480.5979.76−8.1
Murugesan et al. [205]♀ + ♂1135–6511666palpationrandomn.p.92.6164.6290.5388.25−28.4
Ray et al. [206]♀522.622366auscultationrandomn.p.77.670.280.273.2−0.9
Ray et al. [206]♂2323.622366auscultationrandomn.p.74.9173.6174.8575.45−2.5
Sieverdes et al. [207]♀ + ♂1412.1132.532.5ASPrandomn.p.74.872.878.582.64−7.5
Tew et al. [208]♀2573.8120.89.6n.p.randomn.p.79748080−6.3
Thiyagarajan et al. [209]♀ + ♂5144.0812336n.p.c.r.n.p.75727774−0.1
Udupa et al. [210]♂3114.513565ASPrandomn.p.73.5867.4276.1574.64−6.5
Notes: ♀ + ♂ = males and females; ♀ = females only; ♂ = males only; adol. = adolescents; ASP = automatic sphygmanometer; CG = control group; c.r. = cluster randomization; ECG = electrocardiography; ENV = choosing an envelope which contained the allocation towards the treatment or control group; IG = intervention group; min = minute(s); IVRS = interactive voice response system; N = number of participants; n.c. = not calculable; n.p. = not presented; PLAN = PLAN sentences of the statistical software SAS9.1; PMP = postmenopausal; rel. = relative; RHR = resting heart rate; wk = week(s); y = year(s); * mean, median, or range.
Table
Table 2. Effects of regular exercise/sports on RHR according to type of sports/exercise.
Table 2. Effects of regular exercise/sports on RHR according to type of sports/exercise.
Types of Sports/Exercise Participants’ Sex, Number of Comparisons (c), Participants in the Intervention (NIG), and Control Groups (NCG)Meta-Analytic SMD +95%-CI +95%-HK-CIHeterogeneityIGCGCorrelation between Baseline RHR and Change of RHR After Intervention *
Baseline RHR (M(SE))Final RHR: rel. Change (M(SE))Baseline RHR (M(SE))Final RHR: rel. Change (M(SE))
All types of sports
all
c =215, NIG = 6763, NCG = 6189		SMD = −0.29
(95%-CI: −0.35–−0.24, p < 0.001)
(95%-HK-CI: −0.35–−0.24, p < 0.001)		Q = 381.06, p < 0.001, I2 = 43.8%72.4 (0.5)68.7 (0.5)
−5.2 (0.4)%		72.3 (0.6)71.9 (0.6)
−0.5 (0.2)%		−0.36
(95%-CI: −0.47–−0.24, p < 0.001)
females only
c = 65, NIG = 1366, NCG = 1268		SMD = −0.35
(95%-CI: −0.43–−0.26, p < 0.001)
(95%-HK-CI: −0.43–−0.26, p < 0.001)		Q = 67.17, p = 0.305, I2 = 7.7%73.2 (0.8)69.5 (0.9)
−5.1 (0.6)%		73.2 (1.0)72.9 (0.9)
−0.3 (0.2)%		−0.32
(95%-CI: −0.52–−0.08, p = 0.009)
males only
c = 58, NIG = 1208, NCG = 1036		SMD = −0.40
(95%-CI: −0.51–−0.29, p < 0.001)
(95%-HK-CI: −0.52–−0.28, p < 0.001)		Q = 79.35, p = 0.018, I2 = 30.7%70.3 (1.2)65.4 (1.1)
−7.0 (0.6)%		70.5 (1.6)69.9 (1.6)
−0.6 (0.4)%		−0.22
(95%-CI: −0.46–0.04, p = 0.094)
females and males
c = 92, NIG = 4189, NCG = 3885		SMD = −0.21
(95%-CI: −0.29–−0.13, p < 0.001)
(95%-HK-CI: −0.30–−0.12, p < 0.001)		Q = 185.24, p < 0.001, I2 = 50.3%73.1 (0.7)70.0 (0.7)
−4.3 (0.6)%		72.7 (0.9)72.3 (0.9)
−0.6 (0.4)%		−0.49
(95%-CI: −0.63–−0.32, p < 0.001)
Endurance training
all
c = 121, NIG = 2924, NCG = 2533		SMD = −0.33
(95%-CI: −0.40–−0.26, p < 0.001)
(95%-HK-CI: −0.40–−0.26, p < 0.001)		Q = 157.16, p = 0.013, I2 = 23.6%72.4 (0.6)68.0 (0.7)
−6.0 (0.4)%		72.3 (0.8)71.9 (0.8)
−0.1 (0.3)%		−0.19
(95%-CI: −0.36–−0.01, p = 0.042)
females only
c = 35,
NIG = 698, NCG = 620		SMD = −0.38
(95%-CI: −0.49–−0.26, p < 0.001)
(95%-HK-CI: −0.50–−0.26, p < 0.001)		Q = 37.06, p = 0.330, I2 = 8.3%73.6 (1.2)69.8 (1.1)
−5.2 (0.6)%		73.4 (1.5)73.3 (1.3)
−0.2 (0.4)%		−0.26
(95%-CI: −0.55–0.08, p = 0.132)
males only
c = 36, NIG = 792, NCG = 656		SMD = −0.49
(95%-CI: −0.63–−0.35, p < 0.001)
(95%-HK-CI: −0.64–−0.34, p < 0.001)		Q = 45.18, p = 0.077, I2 = 27.0%70.3 (1.6)64.0 (1.6)
−9.0 (0.7)%		70.8 (2.1)70.3 (2.2)
0.0 (0.6)%		−0.18
(95%-CI: −0.49–0.17, p = 0.320)
females and males
c = 50, NIG = 1434, NCG = 1277		SMD = −0.19
(95%-CI: −0.28–−0.11, p < 0.001)
(95%-HK-CI: −0.28–−0.10, p < 0.001)		Q = 53.85, p = 0.294, I2 = 9.0%72.8 (0.7)69.4 (0.8)
−4.6 (0.7) %		72.4 (0.8)71.9 (0.9)
−0.0 (0.5)%		−0.33
(95%-CI: −0.56–−0.05, p = 0.022)
Strength training
all
c = 43, NIG = 720, NCG = 689		SMD = −0.18
(95%-CI: −0.32–−0.04, p = 0.011)
(95%-HK-CI: −0.32–−0.04, p = 0.014)		Q = 64.98, p = 0.013, I2 = 35.4%69.1 (1.2)67.8 (1.2)
−2.5 (0.7)%		68.9 (1.3)69.0 (1.4)
0.1 (0.8)%		−0.04
(95%-CI: −0.34–0.27, p = 0.817)
females only
c = 13, NIG = 243, NCG = 229		SMD = −0.26
(95%-CI: −0.44–−0.08, p = 0.005)
(95%-HK-CI: −0.44–−0.09, p = 0.007)		Q = 9.07, p = 0.697, I2 = 0%69.7 (1.6)68.1 (1.8)
−3.7 (1.0)%		69.4 (1.9)70.0 (2.1)
1.3 (1.6)%		0.19
(95%-CI: −0.43–0.69, p = 0.565)
males only
c = 14, NIG = 225, NCG = 214		SMD = −0.23
(95%-CI: −0.48–0.03, p = 0.081)
(95%-HK-CI: −0.48–0.03, p = 0.075)		Q = 21.39, p = 0.066, I2 = 39.2%69.4 (2.6)67.3 (2.4)
−4.2 (0.9)%		69.1 (3.1)68.1 (3.4)
−1.7 (1.0)%		−0.21
(95%-CI: −0.67–0.36, p = 0.465)
females and males
c = 16, NIG = 252, NCG = 246		SMD = −0.06
(95%-CI: −0.34–0.23, p = 0.704)
(95%-HK-CI: −0.40–0.29, p = 0.737)		Q = 28.95, p = 0.011, I2 = 51.6%67.6 (1.9)67.4 (2.1)
−0.1 (1.0)%		67.6 (1.5)68.0 (1.8)
0.5 (1.9)%		0.15
(95%-CI: −0.39–0.61, p = 0.597)
Combined endurance and strength training
all
c = 15, NIG = 322, NCG = 279		SMD = −0.18
(95%-CI: −0.35–−0.01, p = 0.041)
(95%-HK-CI: −0.37–0.01, p = 0.061)		Q = 15.30, p = 0.358, I2 = 8.5%69.1 (1.5)66.3 (1.8)
−4.8 (0.8)%		69.2 (2.0)68.1 (2.4)
−1.5 (0.8)%		−0.35
(95%-CI: −0.73–0.19, p = 0.195)
females only
c = 6, NIG = 121, NCG = 117		SMD = −0.38
(95%-CI: −0.72–−0.03, p = 0.031)
(95%-HK-CI: −0.83–0.08, p = 0.086)		Q = 7.70, p = 0.174, I2 = 35.1%70.5 (3.4)65.7 (3.2)
−5.9 (1.5)%		71.6 (3.4)70.6 (3.8)
−1.4 (1.5)%		−0.37
(95%-CI: −0.91–0.63, p = 0.475)
males only
c = 3, NIG = 55, NCG = 37		SMD = −0.10
(95%-CI: −0.52–0.32, p = 0.654)
(95%-HK-CI: −0.61–0.41, p = 0.503)		Q = 0.61, p = 0.736, I2 = 0.0%67.5 (6.0)65.3 (4.7)
−2.7 (2.5)%		66.1 (7.5)65.5 (6.9)
−1.4 (2.7)%
females and males
c = 6, NIG = 146, NCG = 125		SMD = −0.06
(95%-CI: −0.29–0.19, p = 0.679)
(95%-HK-CI: −0.32–0.22, p = 0.653)		Q = 3.76,
p = 0.584, I2 = 0%		68.4 (2.0)67.3 (2.5)
−4.3 (1.3)%		68.4 (1.8)67.4 (1.2)
−1.5%		−0.18
(95%-CI: −0.86–0.74, p = 0.738)
Additional school sports
all
c = 5, NIG = 271, NCG = 216		SMD = −0.26
(95%-CI: −0.63–0.10, p = 0.154)
(95%-HK-CI: −0.92–0.39, p = 0.328)		Q = 12.19,
p = 0.016,
I2 = 67.2%		84.8 (3.9)80.4 (4.1)
−5.2 (2.3)%		84.3 (4.8)81.6 (4.4)
−1.4 (1.0)%		−0.09
(95%-CI: −0.90–0.86, p = 0.883)
Unspecified sports activities
all
c = 2, NIG = 1481, NCG = 1414		SMD = −0.13
(95%-CI: −0.52–0.26, p = 0.523)		Q = 2.3, p = 0.130, I2 = 56.4%75.8 (0.3)75.1 (0.7)
−0.9 (1.0)%		75.4 (0.3)76.3 (1.8)
0.7 (2.2)%
Yoga
all
c = 21, NIG = 597, NCG = 589		SMD = −0.37
(95%-CI: −0.58–−0.16, p < 0.001)
(95%-HK-CI: −0.60–−0.14, p = 0.003)		Q = 59.32, p < 0.001, I2 = 66.3%76.1 (2.5)70.4 (1.3)
−7.2 (1.6)%		76.7 (2.4)75.9 (2.1)
−2.0 (0.7)%		−0.87
(95%-CI: −0.94–−0.69, p < 0.001)
females only
c = 7, NIG = 178, NCG = 181		SMD = −0.44
(95%-CI: −0.76–−0.13, p = 0.006)
(95%-HK-CI: −0.84–−0.04, p = 0.036)		Q = 8.36, p = 0.138, I2 = 40.2%76.9 (3.6)71.4 (2.6)
−7.2 (2.3)%		77.1 (3.4)76.2 (3.2)
−1.7 (1.6)%		−0.89
(95%-CI: −0.99–−0.28, p = 0.018)
males only
c = 4, NIG = 124, NCG = 117		SMD = −0.24
(95%-CI: −0.50–0.01, p = 0.063)
(95% HCI: −0.38–−0.10, p = 0.013)		Q = 0.36, p = 0.949, I2 = 0%73.2 (2.3)69.6 (1.7)
−4.8 (2.1)%		74.4 (3.0)74.5 (2.7)
0.7 (2.0)%
females and males
c = 10, NIG = 295, NCG = 291		SMD = −0.41
(95%-CI: −0.77–−0.05, p = 0.028)
(95%-HK-CI: −0.86–0.04, p = 0.069)		Q = 49.28, p < 0.001, I2 = 79.7%76.8 (4.4)70.2 (2.1)
−7.9 (2.7)%		77.3 (4.0)76.3 (3.7)
−2.6 (1.0)%		−0.87
(95%-CI: −0.97–−0.58, p < 0.001)
Tai chi
all
c = 5, NIG = 310, NCG = 317		SMD = −0.26
(95%-CI: −0.68–0.16, p = 0.228)
(95% HCI: −0.89–0.38, p = 0.327)		Q = 24.03, p < 0.001, I2 = 83.4%74.9 (3.2)71.9 (2.1)
−4.7 (1.8)%		73.6 (3.5)72.1 (4.2)
−1.1 (0.8)%		−0.78
(95%-CI: −0.99–0.31, p = 0.115)
Qigong
all
c = 3, NIG = 138, NCG = 142		SMD = −0.23
(95%-CI: −0.47–0.00, p = 0.054)		Q = 1.66, p = 0.437, I2 = 0%84.6 (5.1) 81.6 (4.9)
−1.9 (1.5)%		78.1 (2.7)81.2 (2.6)
3.0 (1.7)%
All Asian sports
all
c = 29, NIG = 1045, NCG = 1038		SMD = −0.34
(95%-CI: −0.50–−0.18, p < 0.001)
(95%-HK-CI: −0.52–−0.16, p < 0.001)		Q = 87.81, p < 0.001, I2 = 68.1%76.8 (1.8)71.6 (1.0)
−6.2 (1.2)%		76.3 (1.7)75.8 (1.6)
−1.3 (0.6)%		−0.75
(95%-CI: −0.88–−0.54, p < 0.001)
females and males
c = 17, NIG = 735, NCG = 732		SMD = −0.35
(95%-CI: −0.57–−0.12, p = 0.002)
(95%-HK-CI: −0.61–−0.08, p = 0.013)		Q = 76.90, p < 0.001, I2 = 76.6%77.5 (2.4)72.1 (1.3)
−6.2 (1.6)%		76.5 (2.3)76.0 (2.1)
−1.3 (0.7)%		−0.74
(95%-CI: −0.89–−0.43, p < 0.001)
* At least 5 trials; c = number of comparisons; CI = confidence interval; HK-CI = Hartung–Knapp confidence interval; I2 = Higgins–Thompson I2; M = mean; NCG = participants in the control groups; NIG = participants in the intervention groups (exercising participants); Q = Cochran’s Q; rel. change = relative change as compared to baseline; RHR = resting heart rate; s = studies (publications); SE = standard error; SMD = standardized mean difference.

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Reimers, A.K.; Knapp, G.; Reimers, C.-D. Effects of Exercise on the Resting Heart Rate: A Systematic Review and Meta-Analysis of Interventional Studies. J. Clin. Med. 2018, 7, 503. https://doi.org/10.3390/jcm7120503

AMA Style

Reimers AK, Knapp G, Reimers C-D. Effects of Exercise on the Resting Heart Rate: A Systematic Review and Meta-Analysis of Interventional Studies. Journal of Clinical Medicine. 2018; 7(12):503. https://doi.org/10.3390/jcm7120503

Chicago/Turabian Style

Reimers, Anne Kerstin, Guido Knapp, and Carl-Detlev Reimers. 2018. "Effects of Exercise on the Resting Heart Rate: A Systematic Review and Meta-Analysis of Interventional Studies" Journal of Clinical Medicine 7, no. 12: 503. https://doi.org/10.3390/jcm7120503

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