Laboratoire REcherche Littorale en Activités Corporelles et Sportives, Dunkerque, Université du Littoral Côte d'Opale, F 59140, Dunkerque, France.
Br J Sports Med. 2009 Oct;43(11):869-70. doi: 10.1136/bjsm.2007.044529. Epub 2008 Apr 2.
To examine fat oxidation rates during exercise in lean and obese pubescent children.
A graded leg cycle ergometry test was performed by two groups of pubescent boys (13 lean: mean (SD) age 12.0 (0.5) years, body mass index (BMI) 18.56 (1.12) kg/m(2); 17 obese: mean (SD) age 12.1 (0.1) years, BMI 26.68 (3.37) kg/m(2); p<0.001). The first step of the test was fixed at 30 W and power was gradually increased by 20 W every 3.5 min. The mean ventilatory gas measurement was obtained during the last 30 s of each step for calculation of fat oxidation rate vs exercise intensity.
At low intensity (0-30% of peak oxygen consumption) when fat-free mass is considered, the fat oxidation rate was identical for the two groups. At higher intensities (40%, 50% and 60% of peak oxygen consumption) the fat oxidation rate was significantly higher in lean boys than in obese boys.
These results confirm that obese pubertal boys have fat-free mass decreased capacities to use fat during moderate exercise. The findings suggest that obese boys need to practise physical activity at a lower intensity than healthy boys to enhance lipolysis and diminish adipose tissue and the consequences of obesity.
研究青春期消瘦和肥胖儿童在运动时的脂肪氧化率。
两组青春期男孩（13 名消瘦者：平均（标准差）年龄 12.0（0.5）岁，体重指数（BMI）18.56（1.12）kg/m(2)；17 名肥胖者：平均（标准差）年龄 12.1（0.1）岁，BMI 26.68（3.37）kg/m(2)；p<0.001）进行分级腿部循环测功试验。测试的第一步固定在 30 W，每 3.5 分钟增加 20 W 的功率。在每一步的最后 30 s 测量平均通气气体，以计算脂肪氧化率与运动强度的关系。
在低强度（0-30%最大摄氧量）下，当考虑去脂体重时，两组的脂肪氧化率相同。在更高的强度（40%、50%和 60%最大摄氧量）下，消瘦男孩的脂肪氧化率明显高于肥胖男孩。
这些结果证实，青春期肥胖男孩在适度运动中使用脂肪的去脂体重能力下降。研究结果表明，肥胖男孩需要比健康男孩在更低的强度下进行体育活动，以增强脂肪分解、减少脂肪组织和肥胖的后果。
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