Table 3

Summary table of results showing relation between sedentary behaviour and measures of body composition

Type of Study

Number of Studies

Number of participants

Narrative recommendation and main findings


RCT

8

1886

Reductions in sedentary behaviour are directly related to improved body composition.

Intervention

10

3547

TV watching and overweight/obesity were related in a dose-response manner (i.e. those who watched more TV were more likely to be overweight/obese).

Longitudinal

33

85753

TV watching and overweight/obesity were related in a dose-response manner (i.e. those who watched more TV were more likely to be overweight/obese).

Cross sectional

119

691759

> 2 hrs of sedentary behaviour related to increased risk of being overweight or obese.


Total of all studies

170

782884

Meta-analysis was performed on randomized controlled studies that looked at change in BMI. They found an effect of -0.89 kg/m2 (95% CI of -1.67 to -0.11, p = 0.03) decrease in mean BMI in the intervention group.

> 2 hrs of sedentary behaviour per day is associated with an increased risk for overweight/obesity. This risk increases in a dose-response manner.

Each additional hour of TV viewing increased risk for obesity. > 2 hrs/day significantly increased risk for overweight/obesity.

Mean Downs and Black score = 20.9 (± 1.9), Level 2 evidence.


Tremblay et al. International Journal of Behavioral Nutrition and Physical Activity 2011 8:98   doi:10.1186/1479-5868-8-98

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