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 .
Physical activity in relation to development and maintenance of obesity in men with and without juvenile onset obesity
OBJECTIVE : To examine long-term effects of leisure time physical activity ( ltpa ) and occupational physical activity ( opa ) on later obesity , and to examine the effect of body weight on later physical inactivity in men with and without juvenile onset obesity . DESIGN : Population -based longitudinal study of obese and nonobese men , who were identified as draftees of median age of 19 y in 1943–77 and later examined at general health surveys in 1982–84 , and in 1991–93 . SETTING : Copenhagen and adjacent regions , Denmark . PARTICIPANTS : In all , 1143 juvenile obese men with a BMI ≥31 kg/m2 ( corresponding to 35 % overweight by an originally used national st and ard ) at draft board examination , and , as a nonobese control group , 1278 men selected as a 0.5 % r and om sample of the approximately 255 600 men examined at the draft board and thus representing the study population .MAIN OUTCOME MEASURES : Obesity , defined as BMI ≥30 kg/m2 , and physical inactivity at the last survey . RESULTS : In the cross-sectional analyses , there were strong concurrent inverse associations between ltpa and prevalence of obesity in both groups , whereas there was no relation to opa . In logistic regression analyses of obesity at the last survey , including both ltpa and opa as well as age , BMI at draft board examination , BMI at first follow-up , length of education , smoking and drinking habits , there were no significant effects of ltpa and opa on the risk of development of obesity in the nonobese group or maintenance of obesity in the obese group . Similar analyses of physical inactivity at the last follow-up as outcome showed a significant direct effect of BMI at first follow-up , with a significant trend in the nonobese group , but not in the obese group and no effects on opa . CONCLUSION : There is no long-term influence of physical activity on development and maintenance of obesity  in men , whereas greater body weight increases risk of later physical inactivity during leisure time
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 .