Combined effect of physical activity and sedentary behavior on body composition in university students

Background & aims: This study aimed to evaluate the domain-specific physical activity (PA) levels and sitting time of a sample of university students and examine the association of PA with percent body fat. Methods: Two hundred and twenty-one students were included in the analysis. We administered the long form of the International Physical Activity Questionnaire (IPAQ) twice within one-month interval. Total PA as well as occupational, transportation-, housework-, and leisure-related PA were assessed, in addition to sitting time. Dietary intake was derived from six non-consecutive 24-hour dietary recalls. Percent body fat (dependent variable) was analyzed using a bioelectrical impedance analyzer (BIA). Multivariate logistic regression, adjusted for potential confounders, examined the associations of domain-specific PA and sitting time with percent body fat. Results: Men had higher levels of total and leisure PA than women. All participants had prolonged sitting time, with 48% having a sitting time of more than 10.15 hours/day. In multivariate analysis, moderate leisure PA, compared to vigorous PA was associated with a lower percent body fat. This association remained statistically significant even after adjustment for energy intake and sitting time. Housework-related PA was associated with a higher percent body fat. Conclusion: Moderate leisure PA was highly associated with percent body fat even after adjustment for confounding variables. Adequate interventions targeting this kind of leisure should be promoted among universities students. (C) 2019 The Authors. Published by Elsevier Ltd.