OBJECTIVE: To investigate the relationships of cardiorespiratory fitness (CRF) and physical activity (PA) with the risk of overweight/obesity in Chinese schoolchildren. METHODS: A total of 1795 children aged 8-13 years at baseline were followed-up for 18 months from 2006 to 2008 in Guangzhou, China. Children were categorized as "normal weight", "overweight", and "obese" using Chinese obesity cut-off points. Data on self-reported PA were obtained. CRF was determined by the 20-meter multistage fitness test, and the sex-specific median values were set as the cut-off points for the classification of high and low CRF. RESULTS: Significantly higher CRF was found in children with normal weight (from 6.55 to 8.65 ml/kg/min) or physically active children (from 0.42 to 1.22 ml/kg/min) compared with the reference group. CRF was inversely associated with the kg/m(2) change in BMI during the follow-up period (beta=-0.63 kg/m(2) and -0.64 kg/m(2) for boys and girls, respectively, both p<0.001). Significant association of baseline CRF with overweight/obesity was found in boys (odds ratio (OR) 8.71; 95% confidence interval (CI) 2.59-29.26, p<0.001), whereas the association was marginally insignificant in girls (OR 6.87; 95% CI 0.96-49.09, p=0.055). CONCLUSIONS: The results showed a strong negative association between CRF levels and children's BMI and weight gain.
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机译：目的：探讨中国小学生心肺健康（CRF）和体育锻炼（PA）与超重/肥胖风险的关系。方法：从2006年至2008年在中国广州市对1795名基线为8-13岁的儿童进行了为期18个月的随访。根据中国肥胖的临界值，将儿童分为“正常体重”，“超重”和“肥胖”。获得有关自我报告的PA的数据。通过20米多级适应性测试确定CRF，并将性别特定的中位数设置为高低CRF分类的临界点。结果：与参考组相比，体重正常的儿童（从6.55至8.65 ml / kg / min）或身体活动的儿童（从0.42至1.22 ml / kg / min）发现的CRF显着更高。在随访期间，CRF与BMI的kg / m（2）呈负相关（男孩和女孩的beta = -0.63 kg / m（2）和-0.64 kg / m（2），两者均p <0.001）。在男孩中发现基线CRF与超重/肥胖之间存在显着关联（优势比（OR）8.71; 95％置信区间（CI）2.59-29.26，p <0.001），而在女孩中这一关联微不足道（OR 6.87; 95） ％CI 0.96-49.09，p ＝ 0.055）。结论：结果显示CRF水平与儿童BMI和体重增加之间存在强烈的负相关性。
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