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Article

High-Intensity Functional Training Guided by Individualized Heart Rate Variability Results in Similar Health and Fitness Improvements as Predetermined Training with Less Effort

by
Justin A. DeBlauw
1,*,
Nicholas B. Drake
2,
Brady K. Kurtz
1,
Derek A. Crawford
3,
Michael J. Carper
1,
Amanda Wakeman
3 and
Katie M. Heinrich
1
1
Department of Kinesiology, Kansas State University, Manhattan, KS 66506, USA
2
Department of Health, Human Performance, and Recreation, Pittsburg State University, Manhattan, KS 66506, USA
3
School of Nutrition, Kinesiology, and Psychological Science, University of Central Missouri, Warrensburg, MO 64093, USA
*
Author to whom correspondence should be addressed.
J. Funct. Morphol. Kinesiol. 2021, 6(4), 102; https://doi.org/10.3390/jfmk6040102
Submission received: 12 October 2021 / Revised: 23 November 2021 / Accepted: 8 December 2021 / Published: 13 December 2021
(This article belongs to the Special Issue Exercise Evaluation and Prescription—2nd Edition)
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Abstract

Heart rate variability (HRV) may be useful for prescribing high-intensity functional training (HIFT) exercise programs. This study aimed to compare effects of HRV-guided and predetermined HIFT on cardiovascular function, body composition, and performance. Methods: Recreationally-active adults (n = 55) were randomly assigned to predetermined HIFT (n = 29, age = 24.1 ± 4.1 years) or HRV-guided HIFT (n = 26, age = 23.7 ± 4.5) groups. Both groups completed 11 weeks of daily HRV recordings, 6 weeks of HIFT (5 d·week-1), and pre- and post-test body composition and fitness assessments. Meaningful changes in resting HRV were used to modulate (i.e., reduce) HRV-guided participants’ exercise intensity. Linear mixed models were used with Bonferroni post hoc adjustment for analysis. Results: All participants significantly improved resting heart rate, lean mass, fat mass, strength, and work capacity. However, no significant between-groups differences were observed for cardiovascular function, body composition, or fitness changes. The HRV-guided group spent significantly fewer training days at high intensity (mean difference = −13.56 ± 0.83 days; p < 0.001). Conclusion: HRV-guided HIFT produced similar improvements in cardiovascular function, body composition, and fitness as predetermined HIFT, despite fewer days at high intensity. HRV shows promise for prescribing individualized exercise intensity during HIFT.
Keywords: autonomic nervous system; exercise intensity; training prescription autonomic nervous system; exercise intensity; training prescription

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MDPI and ACS Style

DeBlauw, J.A.; Drake, N.B.; Kurtz, B.K.; Crawford, D.A.; Carper, M.J.; Wakeman, A.; Heinrich, K.M. High-Intensity Functional Training Guided by Individualized Heart Rate Variability Results in Similar Health and Fitness Improvements as Predetermined Training with Less Effort. J. Funct. Morphol. Kinesiol. 2021, 6, 102. https://doi.org/10.3390/jfmk6040102

AMA Style

DeBlauw JA, Drake NB, Kurtz BK, Crawford DA, Carper MJ, Wakeman A, Heinrich KM. High-Intensity Functional Training Guided by Individualized Heart Rate Variability Results in Similar Health and Fitness Improvements as Predetermined Training with Less Effort. Journal of Functional Morphology and Kinesiology. 2021; 6(4):102. https://doi.org/10.3390/jfmk6040102

Chicago/Turabian Style

DeBlauw, Justin A., Nicholas B. Drake, Brady K. Kurtz, Derek A. Crawford, Michael J. Carper, Amanda Wakeman, and Katie M. Heinrich. 2021. "High-Intensity Functional Training Guided by Individualized Heart Rate Variability Results in Similar Health and Fitness Improvements as Predetermined Training with Less Effort" Journal of Functional Morphology and Kinesiology 6, no. 4: 102. https://doi.org/10.3390/jfmk6040102

APA Style

DeBlauw, J. A., Drake, N. B., Kurtz, B. K., Crawford, D. A., Carper, M. J., Wakeman, A., & Heinrich, K. M. (2021). High-Intensity Functional Training Guided by Individualized Heart Rate Variability Results in Similar Health and Fitness Improvements as Predetermined Training with Less Effort. Journal of Functional Morphology and Kinesiology, 6(4), 102. https://doi.org/10.3390/jfmk6040102

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