Background

Globally level of physical activity (PA) is deteriorating in youth. This study reported the results of Chinese Childhood Health, Activity and Motor Performance Study (Chinese CHAMPS), a school-based PA intervention in Chinese children.

Methods

Chinese CHAMPS was a clustered RCT to modify school PA policy and environment to increase opportunities and support for PA in 7th grade students (n=189, average age=12.4). Twelve middle schools were randomly assigned 1) school physical education intervention (SPE; n=44), 2) after-school program (ASP; n=51), 3) SPE+ASP (39), or 4) control (n=55). Study outcomes included minutes in past 7 days in SED, vigorous PA (VPA), and moderate to vigorous PA (MVPA) by accelerometry, Body Mass Index (BMI; kg/m2), lean body mass (LM; kg) and body fat percent (BFP; %) by bioimpedance at baseline and posttest. Generalized Estimation Equations was used 1) to test changes in SED, VPA, and MVPA, and 2) to test the changes in BMI, LM, and BFP of the treatment controlling gender, change in pubertal stage, and baseline measure with Bonferroni correction.

Results

Compared to control, 7-day MVPA increased significantly 157.9, 86.9, and 234.9 in SPE, ASP, and SPE+ASP, respectively. 7-day VPA increased significantly 67.9, 35.3, and 108.1 in SPE, ASP, and SPE+ASP, respectively, compared to control. Compared to control, BFP was lower in SPE+ASP (-.31, p<.03), LM was higher in SPE (.88, p<.02) and SPE+ASP (1.97, p<.0001), and BMI was lower in SPE+ASP (-.31, p<.03).

Conclusions

Chinese CHAMPS significantly increased time in MVPA and VPA. Only SPE+ASP changed the body composition consistently.