Compositional Analysis of 24-hour Movement Behaviours and Cardiorespiratory Fitness of Undergraduates
Aim:To examined the relationship between 24 h movement behaviors composition and cardiorespiratory fitness(CRF)of undergraduate,and investigated predicted changes in CRF when time in movement behaviors is reallocated.Methods:Data was obtained from the Shanghai University of Sport Alumni Health Cohort Study.A total of 1 039 college students(male 517;female 522;mean age:21.46±0.91)were included in analyses for this study.Sedentary time(SB),light-intensity physical activity(LPA),and moderate-to vigorous-intensity physical activity(MVPA)were measured with ActiGraph GT3X+accelerometers.Sleep duration was subjectively measured.The maximum aerobic metabolic exercise testing on an electrically braked bicycle ergometer was performed to assess CRF,and body composition was assessed by dual-energy X-ray absorptiometry.The compositional analysis was used to verify the association between 24 h movement behaviors and CRF.In addition,the compositional and isotemporal reallocation analysis was used to assess predicted changes in CRF after the time reallocation of various activities.Results:1)After adjusting for confounding factors,compositional data showed that 24 h movement behaviour had significant statistical correlation with CRF.Compared with other activities,the time distribution of MVPA was significantly positively correlated with CRF,while the time distribution of SB was significantly negatively correlated with CRF.There was no significant correlation between the temporal distribution of LPA.2)In the subgroup analysis,after adjusting confounding factors,the findings of the hgih body fat percentage group and the non-sport major students'group were consistent with the above results;however,there is no relationship between CRF and each component of the low body fat percentage group and the sport-major students group.3)In compositional isotemporal substitution analysis,when MVPA replaces other movement behaviors,the range of increasing CRF are lower than the range of declining CRF when other movement behaviors replace MVPA.Conclusion:MVPA and SB are the main factors influencing undergraduates'CRF,comparing controlling SB,it's more important to encourage them spend time in MVPA than SB,especially student who are high body fat percentage.
24-hour movement behavioursphysical activitysedentary behavioursleepcardiopulmonary fit-nesscompositional analysis
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万方数据
