Effect of Exercise Intensity on Spontaneous Physical Activity Energy Expenditure in Overweight Boys: A Crossover Study

ObjectiveEvaluate the effect of different exercise intensities on spontaneous physical activity energy expenditure in overweight adolescents.MethodsA crossover study was developed with a control session, followed by moderate and vigorous exercise sessions, with six days of monitoring each. Twenty-four adolescents, 11–13 years old, male and overweight were selected. Spontaneous physical activity energy expenditure was assessed by accelerometers. Linear mixed effects models were used to evaluate the differences per session across time.ResultsEnergy expenditure during the 1st hour was different between all three sessions, with averages of 82, 286 and 343 kcal to the control, moderate and vigorous sessions, respectively (p ConclusionsA single aerobic session seems to modify the spontaneous physical activities in overweight adolescents but still keeping the vigorous session with higher total energy expenditure during the follow-up period. Despite the observed compensatory effect, the greater energy expenditure observed in both moderate and vigorous exercise sessions indicates that physical activity should be recommended to promote an increased energy expenditure in adolescents.Trial RegistrationClinicalTrials.gov NCT 02272088

研究目标：评估不同运动强度对超重青少年自发性体力活动能量消耗的影响。
研究方法：本研究采用交叉试验（crossover study）设计，设置对照阶段，随后依次开展中等强度运动阶段与高强度运动阶段，每个阶段均进行为期6天的监测。招募24名年龄11~13岁的男性超重青少年作为研究对象。采用加速度计（accelerometers）评估受试者的自发性体力活动能量消耗，通过线性混合效应模型（linear mixed effects models）分析各阶段随时间推移的组间差异。
研究结果：三个阶段在实验首小时的能量消耗均存在显著差异，对照、中等强度运动、高强度运动阶段的平均能量消耗分别为82、286与343千卡（p）。
研究结论：单次有氧训练似乎会改变超重青少年的自发性体力活动模式，但在随访周期内，高强度运动阶段仍维持更高的总能量消耗。尽管观察到补偿效应，中等强度与高强度运动阶段均表现出更高的能量消耗，提示应推荐体力活动以提升青少年的能量消耗水平。
试验注册：ClinicalTrials.gov NCT 02272088