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Energy balance in adolescent girls: The trial of activity for adolescent girls cohort

机译：青春期女孩的能量平衡：青春期女孩队列的活动试验

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Objectives To study correlates of change in BMI percentile and body fat among adolescent girls. Methods A longitudinal prospective study following 265 girls from the Trial of Activity for Adolescent Girls (TAAG) cohort measured in 8th grade and during 10 and 11th grade or 11th and 12th grade. Twice during 2009-2011 girls wore an accelerometer and completed a food frequency questionnaire and 7-day diary documenting trips and food eaten away from home and school. Physical activity, BMI, and percent body fat were objectively measured at each time point. Results Moderate to vigorous physical activity (MVPA) declined, but the change was not independently associated with changes in BMI percentile. Increased vigorous physical activity was associated with reductions in body fat. Diet was associated with both changes in BMI percentile and body fat. Girls who increased the percentage of caloric intake from snacks and desserts reduced their BMI percentile and body fat. Conclusions Some relationships between energy balance behaviors and BMI and body composition were counter-intuitive. While it is plausible that vigorous physical activity would result in reductions of body fat, until more accurate methods are devised to measure diet, the precise contribution of dietary composition to health will be difficult to assess.
机译：目的研究青春期女孩体重指数（BMI）百分数与体脂变化的相关性。方法采用纵向前瞻性研究，对来自8年级，10年级，11年级或11年级和12年级的青春期女孩活动试验（TAAG）队列中的265名女孩进行了研究。在2009-2011年期间，有两次女孩穿着加速计并完成了一次食物频率问卷调查和为期7天的日记，记录了旅途和在家庭和学校外食用的食物。在每个时间点客观地测量身体活动，BMI和体脂百分比。结果中度至剧烈的体育活动（MVPA）下降，但这种变化与BMI百分位数的变化并非独立相关。剧烈运动量增加与体内脂肪减少有关。饮食与体重指数（BMI）百分数和身体脂肪的变化有关。增加零食和甜点中热量摄入百分比的女孩减少了其BMI百分位数和体内脂肪。结论能量平衡行为与BMI和身体组成之间的某些关系是违反直觉的。尽管剧烈的体育锻炼可能会减少体内脂肪，但在设计出更精确的饮食测量方法之前，饮食组成对健康的精确贡献将难以评估。

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