Conclusions Meta- analysis of data from prospect i ve cohort studies showed small , inconsistent and non-significant associations between sedentary behavior and body weight
Background The cumulative effect of too much sedentary behavior may contribute to  weight gain and obesity .
Objective The aim of this study was to conduct a systematic review and meta- analysis of prospect i ve cohorts and r and omized controlled studies to determine the association between sedentary  behavior  and body weight and obesity in adults .
Prospective association between body composition, physical activity and energy intake in young adults
Background / Objectives : Despite considerable research on the association between physical activity ( PA ) and body composition , there remains limited information on the directionality of the relationship . The present study examined the prospect i ve associations among objective ly measured PA , energy intake ( EI ) and body composition . Subjects/ Methods : A convenience sample of 430 adults ( 49 % male ) between 21 and 35 years of age was followed over 1 year with repeated measurements taken every 3 months . BMI ( kg/m2 ) and percent body fat ( % BF ) were calculated based on anthropometric measurements and dual energy X-ray absorptiometry . A multi-sensor device was worn over a period of 10 days to estimate total daily energy expenditure and time spent in different intensities . EI was calculated based on change in body composition and total daily energy expenditure . Results : A total of 379 participants provided valid data . On average , participants experienced a significant weight gain of 1.2±4.3 kg during the 12-month observation period , which was associated with an increase in % BF ( 0.8±3.2 % ) . Average time spent in moderate-to-vigorous PA ( MVPA ) decreased significantly , whereas EI remained constant . Optimal linear mixed models , adjusting for age and sex , showed an inverse effect of MVPA on BMI and % BF , whereas EI only directly affected BMI ( P<0.001 ) . There was also a significant inverse effect of BMI and % BF on MVPA ( P<0.001 ) . Conclusions : Results of this study indicate an inverse reciprocal association between MVPA and measures of adiposity . Thus , primary preventive actions are warranted to avoid excess weight gain , which may result in a vicious cycle of weight gain and low PA
Conclusions Meta- analysis of data from prospect i ve cohort studies showed small , inconsistent and non-significant associations between sedentary behavior and body weight
Background The cumulative effect of too much sedentary behavior may contribute to  weight gain and obesity .
Objective The aim of this study was to conduct a systematic review and meta- analysis of prospect i ve cohorts and r and omized controlled studies to determine the association between sedentary  behavior  and body weight and obesity in adults .