Search Results (76)

Background: Chronic wrist pain is becoming increasingly recognized among athletes engaging in wrist-loading activities such as handstands. However, its prevalence and associated risk factors in handstand practitioners have not been systematically studied. This study aimed to investigate the prevalence of chronic wrist pain and to explore associated factors such as discipline, training habits, and pain management strategies. Methods: This cross-sectional study aimed to investigate the prevalence and associated factors of chronic wrist pain among handstand practitioners. Eligible participants were individuals aged 18 years or older, of any gender, who practiced handstands regularly (defined as at least once per week). Participants were recruited via a combination of open invitations on social media (Facebook, WhatsApp, Instagram) and direct outreach to movement studios and training communities. The survey was administered online using Google Forms and remained open for two months. Participation was voluntary and anonymous. Descriptive statistics were used to present sociodemographic characteristics, including age group, gender, sport discipline, and weekly training hours. Participants reported training habits, equipment use, pain history, and management strategies via a self-developed questionnaire designed for this study. Chronic pain was defined as recurring or persistent wrist pain. Descriptive statistics were used to summarize responses. Associations between chronic wrist pain and survey variables were analyzed using Chi-square or Fisher’s exact tests for nominal data, and Chi-square test for trend for ordinal data. A p-value < 0.05 was considered statistically significant. Results: A total of 321 participants were included in the study. The most represented age group was 25–34 years, comprising 123 (38.3%) of the participants. Gender distribution was 174 (54.2%) males and 147 (45.8%) females. The most common sport disciplines were Yoga (88, 27.4%), Capoeira (60, 18.7%), and Movement (52, 16.2%). Chronic wrist pain was reported by 182 (56.7%) of participants. Younger age was significantly associated with higher pain prevalence (p = 0.042). No significant associations were observed between chronic pain and weekly training hours, warm-up routines, brace use, or grip device use. Female participants demonstrated more proactive pain management behaviors (p = 0.016). Sport discipline and training practices showed non-significant trends toward pain differences. Conclusions: Chronic wrist pain is common among handstand practitioners, particularly among younger athletes. These findings suggest that injury risk may relate more to training intensity and biomechanics than to simple training volume. Further research incorporating objective diagnostics and standardized intervention protocols is warranted. Full article

Background: It is important to investigate the combination of 24 h movement behaviors (24 h MB)—such as physical activity, screen time, and sleep—as children’s daily habitual behaviors significantly influence their health-related quality of life (HRQoL). However, such studies remain extremely limited in East Asia. This study aimed to examine whether adherence to the 24 h MB is associated with HRQoL among children from three East Asian countries. Methods: In this cross-sectional study, data were collected from primary school children aged 7–12 years in Japan (n = 786), China (n = 1246), and South Korea (n = 1011). HRQoL was assessed using the KIDSCREEN-27 questionnaire, while physical activity, screen time, and sleep duration were measured through a self-reported questionnaire survey. Results: Logistic regression analyses, adjusted for relevant covariates, confirmed significant associations with HRQoL subfactors including physical well-being, psychological well-being, social support, and peer relationships. Conclusions: Our findings highlight the critical relationship between adherence to 24 h MB and HRQoL in East Asian children, contributing valuable evidence to support integrated health promotion strategies in this region. Full article

Background/Objectives: Noncommunicable diseases (NCDs) are the leading causes of global mortality among adults. The aim of this study was to examine the association between adherence to 24 h movement behavior guidelines and the diagnosis of NCDs. Methods: This cross-sectional study was conducted with users of the Health Academy Program in Brazil. The sample consisted of 1212 individuals (92.9% female), aged 18 years or older. Dependent variables included self-reported hypertension, diabetes, hypercholesterolemia, and cardiovascular disease based on previous medical diagnosis. Independent variables (physical activity, screen time, and sleep) were self-reported. Binary and multinomial logistic regressions were performed and adjusted for sex, age, educational level, body mass index, and marital status. Results: Participants who did not meet any of the 24 h movement behavior recommendations had higher odds of hypertension (OR: 1.35; 95% CI: 1.15–1.77), diabetes (OR: 1.07; 95% CI: 1.03–2.01), and having two (OR: 1.29; 95% CI: 1.09–2.91) or three or more NCDs (OR: 1.40; 95% CI: 1.11–2.13). Not meeting the physical activity recommendation was associated with higher odds of hypercholesterolemia (OR: 1.37; 95% CI: 1.06–1.76). In contrast, meeting the physical activity guideline alone (OR: 0.32; 95% CI: 0.11–0.85) or in combination with adequate sleep (OR: 0.32; 95% CI: 0.11–0.90) was associated with lower odds of cardiovascular disease. All of these results remained significant after adjustments for multiple comparisons. Conclusions: Not meeting any of the 24 h movement behavior guidelines, especially those related to physical activity, was associated with a higher occurrence of NCDs. Full article

This work presents a one-dimensional (1D) model for simulating the behavior of an FCC riser reactor processing bio-oil. The FCC riser is modeled as a plug-flow reactor, where the bio-oil feed undergoes vaporization followed by catalytic cracking reactions. The bio-oil droplets are represented using a Lagrangian framework, which accounts for their movement and evaporation within the gas-solid flow field, enabling the assessment of droplet size impact on reactor performance. The cracking reactions are modeled using a four-lumped kinetic scheme, representing the conversion of bio-oil into gasoline, kerosene, gas, and coke. The resulting set of ordinary differential equations is solved using a stiff, second- to third-order solver. The simulation results are validated against experimental data from a full-scale FCC unit, demonstrating good agreement in terms of product yields. The findings indicate that heat exchange by radiation is negligible and that the Buchanan correlation best represents the heat transfer between the droplets and the catalyst particles/gas phase. Another significant observation is that droplet size, across a wide range, does not significantly affect conversion rates due to the bio-oil’s high vaporization heat. The proposed reduced-order model provides valuable insights into optimizing FCC riser reactors for bio-oil processing while avoiding the high computational costs of 3D CFD simulations. The model can be applied across multiple applications, provided the chemical reaction mechanism is known. Compared to full models such as CFD, this approach can reduce computational costs by thousands of computing hours. Full article

Research on how an active lifestyle impacts the social functions of neurodiverse children, particularly within the context of twenty-four-hour (24 h) movement behaviors (i.e., physical activity, sedentary behaviors, sleep), has been emerging but has yet to receive a systematic synthesis. In this scoping review, we aimed (1) to synthesize current knowledge in the field of 24 h movement behaviors and social functions in neurodiverse children; and (2) to offer insights into implications for future research and practices. Specifically, we conducted a systematic search via four databases, namely the Web of Science, PubMed, Scopus, and EBSCOhost, through 31st December 2024, and followed scoping review guidelines for results synthesis. The initial search returned 2342 articles, of which 50 studies fulfilled the inclusion criteria following a robust selection and screening process. These retained studies were published between 2004 and 2024, primarily focused on children with neurodiversity of autism spectrum disorder, or ASD (70%), and attention deficit/hyperactivity disorder, or ADHD (23%), and using quantitative methods (84%). Only 6% of studies considered the combined effects of different 24 h movement behaviors, with most examining physical activity alone. Longer group exercise interventions were found to be more effective in improving social functions in neurodiverse children. Overall, the findings support the position that 24 h behaviors have a positive influence on the social functioning of neurodiverse children. However, current research tends to focus primarily on ASD, uses quantitative methods, and often overlooks the combined effects of physical activity, sleep, and sedentary behavior. Future studies should address these limitations and examine 24 h movement behaviors in children with a broader range of neurodiverse characteristics. Research and practices should also consider qualitative approaches as a complement to quantitative measures for monitoring and evaluation. Full article

Background: It remains unclear whether adherence to the 24-hour movement guidelines is beneficial for children with mental, behavioral, and developmental disorders (MBDDs). Methods: The results of the 2016–2020 National Survey of Children’s Health (NSCH) in the U.S. were used in this study. All types of MBDDs, adherence to the different movement guidelines (physical activity [PA], screen time [ST], and sleep), and various health indicators (general physical health, emotional regulation, cognitive and social functioning) were parent-reported. Weighted logistic regression models were used to assess the associations between adherence to the 24-hour movement guidelines and health indicators in children with and without MBDDs. Results: The majority of children with MBDDs had a lower weighted proportion of meeting the PA, ST, and sleep guidelines compared to those without MBDDs (all p values < 0.05). Less than half of the associations between adherence to the 24-hour movement guidelines and the different health indicators were significant among children with MBDDs, while the associations were all significant among children without MBDDs (ORs ranged 1.22–2.10, all p values < 0.05). When there were no between-group differences in the statistically significant associations between guideline adherence and health indicators (e.g., sleep guideline and general physical health), children with specific MBDDs can achieve comparable health benefits through adherence to the 24-hour movement guidelines (e.g., children with emotional disorders or developmental disorders experience better general physical health through adherence to the sleep guideline). Conclusion: We highlight the prioritization of the 24-hour guidelines for different health indicators among children with various MBDDs, and children with certain MBDDs could attain similar health benefits as those without these conditions by adhering to the 24-hour movement guidelines. Full article

Background: There has been a substantial increase in research on the new 24-hour movement paradigm, emphasizing the importance of considering the “whole day” and investigating integrated movement behaviors (physical activity, sedentary behavior, and sleep). This scoping review aims to map the evidence from reviews that have summarized information on integrated 24-hour movement behaviors in children and adolescents. Methods: Eight databases were searched in May 2023, with an update in October 2024. The review followed the PRISMA-ScR framework and the guidelines of the Joanna Briggs Institute Reviewer’s Manual. Results: National 24-hour movement guidelines for children and adolescents exist in only a few countries (Australia, Canada, New Zealand, and South Africa). There is a lack of valid and reliable measurement tools for assessing 24-hour movement. Globally, children and adolescents, with and without disabilities, show low adherence to these guidelines. Reallocating time to moderate-to-vigorous physical activity was beneficial, while other reallocations had mixed results to health. COVID-19 reduced physical activity and increased screen time and sleep. Healthy movement behaviors are positively associated with better health outcomes in children and adolescents. There is a possible relationship between adherence to 24-hour movement behaviors and cognitive function, pollution measures, and eHealth interventions. Inconsistencies were identified in the terms used. Conclusions: High-quality research is needed to develop measurement tools that assess the long-term health impact of 24-hour movement and to create solutions for improving adherence, mainly in countries lacking specific guidelines. Full article

Background: Vitamin D and lifestyle behaviors are closely related to children’s health. However, current research on the combined influences of vitamin D and adherence to 24-Hour Movement Guidelines (24-HMG) on childhood obesity remains scarce. Our study aimed to examine individual and joint associations of vitamin D status and the number of recommendations for adhering to 24-HMG with obesity among Chinese children and adolescents. Methods: In this cross-sectional study, a total of 4625 participants from Shenzhen, China, were recruited. Vitamin D status was classified into two categories: adequacy and inadequacy. The 24-HMG was obtained from a validated questionnaire, including moderate-to-vigorous physical activity, screen time, and sleep duration. General obesity and metabolically unhealthy obesity (MUO) were the outcomes of this study. The logistic regression model was performed to examine the associations between vitamin D status, the number of guidelines met, and obesity. Results: Vitamin D inadequacy was associated with increased odds of general obesity and MUO, with adjusted odds ratios (95% CIs) of 1.551 (1.080–2.226) and 2.205 (1.319–3.686). Meeting 2–3 recommendations of 24-HMG was associated with decreased odds of general obesity, with adjusted odds ratios (95% CIs) of 0.777 (0.626–0.965). Compared with the vitamin D adequacy/meeting 2–3 guidelines group, the vitamin D inadequacy/meeting 0–1 guideline group was positively related to general obesity (adjusted odd ratio, 1.826 [95% CI: 1.167–2.857]) and MUO (2.160, 1.175–3.972). In addition, the population-attributable fractions of vitamin D inadequacy or/and meeting 0–1 guideline were 28.4% (95% CI: 2.5–54.4%) for general obesity and 42.3% (95% CI: 11.5–73.1%) for MUO. Conclusions: Our findings displayed that the combined associations of vitamin D inadequacy and meeting 0–1 recommendations of 24-HMG were linked to high odds of general obesity and MUO, respectively. Understanding these relationships could provide a theoretical basis for effective preventive strategies and interventions for childhood obesity. Full article

This study presents a parametric analysis of the factors impacting particle distribution within a bus environment using computational fluid dynamics (CFD) simulations, with a primary focus on the relative concentration (RC) of particles. The Novel Relative Concentration (RC) metric, which measures the deviation from a return concentration, was used to assess the effects of ventilation rates, the number and spatial arrangement of particle emitters, and thermal conditions. Our investigation reveals that increasing air changes per hour (ACHs) from 5.74 h⁻¹ to 28.66 h⁻¹ reduces the overall particle concentration by approximately 45%, but localized high concentration zones persist, with maximum RC values observed at 1.57. Scenarios with evenly distributed emitters achieved near-uniform particle distribution, with RC values averaging around 0.95, while clustered emitters resulted in localized high concentrations, with RC values exceeding 2.0. Thermal conditions were found to have a minimal effect on RC, with average values of 1.664 for cooling and 1.588 for heating, showing only a 4.68% difference. The RC metric provided clear insights into the non-uniformity of particle distribution, highlighting areas prone to higher concentrations, with some zones reaching RC values of 2.5, indicating concentrations 2.5 times higher than the well-mixed average. These findings underscore the importance of optimizing ventilation systems for both overall air exchange and uniform air distribution, offering practical implications for improving air quality and reducing the risk of airborne pathogen transmission in public transportation systems. Future research should explore real-time ventilation adjustments based on passenger load, the effects of different particle types, and the development of models incorporating human behavior and movement patterns. Full article

Background: Pose estimation (PE) has the promise to measure pediatric movement from a video recording. The purpose of this study was to quantify the accuracy of a PE model to detect arm and leg movements in 3-month-old infants with and without (TD, for typical development) complex congenital heart disease (CCHD). Methods: Data from 12 3-month-old infants (N = 6 TD and N = 6 CCHD) were used to assess MediaPipe’s full-body model. Positive predictive value (PPV) and sensitivity assessed the model’s accuracy with behavioral coding. Results: Overall, 499 leg and arm movements were identified, and the model had a PPV of 85% and a sensitivity of 94%. The model’s PPV in TD was 84% and the sensitivity was 93%. The model’s PPV in CCHD was 87% and the sensitivity was 98%. Movements per hour ranged from 399 to 4211 for legs and 236 to 3767 for arms for all participants, similar ranges to the literature on wearables. No group differences were detected. Conclusions: There is a strong promise for PE and models to describe infant movements with accessible and affordable resources—like a cell phone and curated video repositories. These models can be used to further improve developmental assessments of limb function, movement, and changes over time. Full article

Understanding activity levels during fasting is important for promoting healthy fasting practices. While most existing studies focus on step counts to objectively assess the impact of fasting on activity levels and behavioral changes, the results have been mixed. Despite evidence showing that individuals spend a significant amount of time sitting while fasting, there has been no objective measurement of body movement or activity levels during sitting and fasting. This research employs a video-based, unobtrusive human body movement measurement system to monitor upper body movements during fasting and non-fasting periods over several days. Key movement features, such as inactivity, movement speed, and movement scale, were automatically extracted from the video monitoring data using a computer vision pipeline. These features were then statistically compared using t tests between fasting and non-fasting periods, analyzed by hour of the day and across different days. The results of the monitoring of five participants during typical daily sitting office work and fasting for 3–5 days indicate no consistent pattern of upper body movement changes due to fasting among the participants. Full article

Background: Adherence to the World Health Organization’s 24-hour movement behavior (24-HMB) guidelines is associated with various health outcomes. However, its relationship with bone mineral density (BMD) in young children has not been investigated. This study aimed to examine the cross-sectional and longitudinal associations between adherence to the 24-HMB guidelines and BMD in young children. Methods: A total of 120 children aged 3–5 years were recruited from three kindergartens in Changsha, Hunan, China. Physical activity (PA) was objectively measured using ActiGraph wGT3X-BT accelerometers, and BMD was assessed using the Sunlight Omnisense 7000P ultrasound device. Screen time (ST) and sleep duration (SD) were reported by parents. Logistic regression was used to analyze the associations between guideline adherence and BMD. Results: Only 5.5% of the participants met all three guidelines for PA, ST, and SD, while 16.5% did not meet any. In the cross-sectional analysis, young children who met both ST and SD guidelines (OR = 0.29, 95% CI: 0.09, 0.95) had a lower risk of insufficient BMD compared to those who met none. In the one-year cohort follow-up, young children who met the PA guideline at baseline (OR = 0.22, 95% CI: 0.07, 0.71), as well as those who met both the PA and ST guidelines (OR = 0.18, 95% CI: 0.04, 0.83) or all three (OR = 0.13, 95% CI: 0.03, 0.69), had a lower risk of insufficient BMD at one year. Conclusions: Adherence to the 24-HMB guidelines may promote bone health in young children. Future research should prioritize achievable goals, such as limiting ST and ensuring adequate SD, while gradually increasing MVPA to optimize bone development. Full article

Background/Objectives: Twenty-four-hour movement behaviors, including physical activity, sedentary time, and sleep, are associated with a range of health outcomes. However, the relationship between the combinations of these behaviors and dietary outcomes in young populations remains unclear. We conducted a systematic review to explore how combined movement behaviors are linked to dietary outcomes in children and adolescents. Methods: We searched MEDLINE, Embase, and PsycINFO from January 2017 to July 2024, including studies that were (1) written in English, (2) published in peer-reviewed journals, (3) quantitatively analyzed two or three movement behaviors with dietary outcomes, and (4) focused on populations aged between 0 and 18 years. Results: Ten cross-sectional studies met these criteria. The majority of studies (6 out of 10) assessed all three movement behaviors, although sleep was less frequently examined, appearing in only 4 of the studies. Our findings indicated that adhering to all movement recommendations was consistently associated with healthier dietary patterns, including a higher consumption of fruits, vegetables, nuts, fish, and cereals, and a lower intake of sweets and pastries. Additionally, adhering to physical activity and sedentary time guidelines was linked to improved dietary habits in children, including more fruit and vegetable intake and less sugary drink and snack consumption. Conversely, higher sedentary time and inadequate sleep were linked to poorer dietary outcomes, particularly lower fruit intake and hydration. Conclusions: This review suggests that meeting movement behavior guidelines correlates with healthier dietary outcomes in children and adolescents. However, given the limited number of studies and their cross-sectional design, further high-quality research, including longitudinal and intervention studies, is needed to clarify causal relationships. Full article

The levels of adequacy of movement behaviors after returning to in-person school activities following the COVID-19 pandemic are not yet well understood. This study aimed to assess the adherence of Brazilian minors to the recommendations of the 24-Hour Movement Guidelines (moderate to vigorous physical activity, recreational screen time, and sleep duration), as well as overall adherence to these guidelines, after the relaxation of COVID-19 social isolation measures and the resumption of in-person schooling. A cross-sectional study was conducted with parents or guardians (39 ± 7.8) of minors aged up to 18 years of age (3.8 ± 2.5). A total of 172 individuals responded to the questionnaire. Data were compared with those obtained in the Survey of the Adequacy of Brazilian Children and Adolescents to the 24-Hour Movement Guidelines before and during the COVID-19 Pandemic. There was an 18.6 percentage decrease (p-value < 0.001) in overall adherence to the 24-Hour Movement Guidelines when comparing the periods before the COVID-19 pandemic (March 2020) and after the return to in-person schooling (March 2021). The largest percentage drop in adherence between these periods was observed for moderate to vigorous physical activity (27.4%; p-value < 0.001) and the lowest for sleep (10.5%; p-value < 0.001). Adherence to the 24-Hour Movement Guidelines did not return to pre-pandemic levels with the resumption of in-person school activities. Full article

The double burden of malnutrition (DBM) is a condition in which malnutrition coexists with overweight, reflecting a new layer of malnutrition. Our objectives were to assess prevalence; test associations between DBM and 24-hour movement behaviors; and investigate whether DBM is associated with clusters of social determinants. Methods: This multicenter cross-sectional study included 1152 adolescents (12 to 17 years old) from four Brazilian cities. Body mass index (BMI, kg/m²) was used to estimate overweight, and the adopted cutoff points took into account the curves established for age and sex: Z-score > 1 and ≤2 (overweight) and Z-score > 2 (obesity). The serum concentration of 25-hydroxyvitamin D [25(OH)D] was stratified into three levels: vitamin D deficiency ≤ 20 ng/mL; vitamin D insufficiency = 21–29 ng/mL; optimal vitamin D ≥ 30 ng/mL. We used multilevel Poisson regression models to estimate prevalence ratios (PRs) and their respective 95% confidence intervals (95%CI) and to analyze the association between DBM and covariates. A significance level of p < 0.05 was considered. Cluster analyses were performed by applying a combination of hierarchical and non-hierarchical methods. Results: A population prevalence of DBM of 7.3% (95% CI: 5.9–8.9) was revealed. A percentage of 19.2% (95% CI: 17.0–21.6) of adolescents were overweight, and 8.3% (95% CI: 6.8–10.1) were obese. A total of 41.5% (95% CI: 38.7–44.4) had vitamin D deficiency, and 25.8% (95% CI: 23.4–28.4) had vitamin D insufficiency. However, 24-hour movement behaviors were not associated with DBM. Adolescents living in the southern region of the country, from public schools whose mothers have higher education, have a 1.94 [PR = 2.94 (95% CI: 1.20–7.23)] times greater chance of developing DBM. These results highlight the importance of specific factors to improve the nutritional health of adolescents, considering the specific social determinants identified in this study. Full article