초등학교 상급학생의 신체활동 수준별 비만 위험도 분석

Abstract

In this cross-sectional study, we examined the relationship between objectively-measured physical activity and obesity parameters in 473 upper class students of elementary school. Low, moderate, and vigorous physical activities were monitored by wearing an accerometer for 7 consecutive days. Measured parameters of obesity included percent body fat, body mass index (BMI), waist circumference (WC), and waist-to-hip ratio (WHR). Sexual maturity was assessed with using a Tanner scale. Indepenendent t-test and Pearson correlation analysis were used to test mean differences in measured variables and to calculate correlation coefficients, respectively. Logistic regression analysis was conducted to estimate odds ratios (ORs) and 95% confidence intervals (CIs) for obesity risk by levels of physical activity. Girls had significantly higher values in Tanner scale, percent body fat, daily physical activity than boys. By contrast, boys had significantly higher values in BMI, WC, and WHR than girls. Logistic gression analysis showed that inactive students were likely to have higher risks for obesity, abdominal obesity, and upper body obesity compared to active students. In particular, inactivie students had a significantly higher risk for BMI-based obesity even after adjustments for age, sex, and Tanner scales as compared to active students. In summary, the current findings of the study showed that physical inactivity was an independent predictor for obesity in upper class students of elementary school, implying an urgency of an exercise intervention for the prevention of obesity and its metabolic complications associated with physical inactivity.