Associations with Physical Activity and Sedentary Behavior with Physical Fitness in Chinese Children and Adolescents
Zheng Zhu1,2, Peijie Chen1,2, Zhen-Bo Cao1,2, Yan Tang1,2, Jie Zhuang1,2, Yang Liu1,2
1.Shanghai University of Sport
2.Shanghai Research Center for Physical Fitness and Health of Children and Adolescents
PURPOSE: The purpose of this study is to examine the associations of physical activity and sedentary behavior with physical fitness in Chinese children and adolescents.
METHODS: A total of 33,414 participants (boys:48.9%, age:12.5±2.5 yr, weight:48.0±14.9 kg, height:154.6±13.9 cm, BMI:19.7±3.9 kg/m2) completed physical activity and sedentary behavior questionnaire and physical fitness test including Body Mass Index (BMI), lung capacity, sit and reach, jump rope/long jump, sit-ups/pull up and shuttle run /800meter/1000meter run. The participants were categorized into either “fit” or “unfit” by using National Students Physical Fitness Standard depending on whether they met the standard or not. Multiple logistic regressions were performed to examine the associations of physical activity and sedentary behavior with physical fitness after controlling for gender, age and BMI.
RESULTS: After adjusting gender, age and BMI, physical activity and sedentary behavior were significantly associated with physical fitness, independently. The children and adolescents who did not meet the recommendation of 60 min/day of moderate and vigorous physical activity (MVPA) had 1.97 times the odds of being unfit compared to those meeting guideline (95% confidence interval [CI] of Odds Ratio:1.69-2.30). The children and adolescents who did not meet the sedentary behavior guideline had 1.27 times the odds of being unfit (95% CI of Odds Ratio: 1.07-1.50). In joint association analysis, children who did not meet physical activity nor sedentary behavior guidelines had 2.26 times higher odds of being unfit than children who met both guidelines (95% CI of Odds Ratio: 1.61-3.17).
CONCLUSION: The results demonstrated that being physically active and reducing the sedentary behavior are independently and positively associated with physical fitness in children and adolescents.