碳水化合物摄入会减少肥胖男孩运动时的脂肪氧化。
Carbohydrate intake reduces fat oxidation during exercise in obese boys.
机构信息
Children's Exercise and Nutrition Centre, McMaster University, Children's Hospital, Chedoke Hospital, Evel Bldg, Room 469, Sanatorium Road, P.O. Box 2000, Hamilton, ON, L8N 3Z5, Canada.
出版信息
Eur J Appl Physiol. 2011 Dec;111(12):3135-41. doi: 10.1007/s00421-011-1940-1. Epub 2011 Apr 6.
The recent surge in childhood obesity has renewed interest in studying exercise as a therapeutic means of metabolizing fat. However, carbohydrate (CHO) intake attenuates whole body fat oxidation during exercise in healthy children and may suppress fat metabolism in obese youth. To determine the impact of CHO intake on substrate utilization during submaximal exercise in obese boys, seven obese boys (mean age: 11.4 ± 1.0 year; % body fat: 35.8 ± 3.9%) performed 60 min of exercise at an intensity that approximated maximal fat oxidation. A CHO drink (CARB) or a placebo drink (CONT) was consumed in a double-blinded, counterbalanced manner. Rates of total fat, total CHO, and exogenous CHO (CHO(exo)) oxidation were calculated for the last 20 min of exercise. During CONT, fat oxidation rate was 3.9 ± 2.4 mg × kg fat-free mass (FFM)(-1 )× min(-1), representing 43.1 ± 22.9% of total energy expenditure (EE). During CARB, fat oxidation was lowered (p = 0.02) to 1.7 ± 0.6 mg × kg FFM(-1 )× min(-1), contributing to 19.8 ± 4.9% EE. Total CHO oxidation rate was 17.2 ± 3.1 mg × kg FFM(-1 )× min(-1) and 13.2 ± 6.1 mg × kg FFM(-1) × min(-1) during CARB and CONT, respectively (p = 0.06). In CARB, CHO(exo) oxidation contributed to 23.3 ± 4.2% of total EE. CHO intake markedly suppresses fat oxidation during exercise in obese boys.
最近儿童肥胖率的上升再次引起了人们对运动作为代谢脂肪的治疗手段的兴趣。然而，在健康儿童中，碳水化合物（CHO）的摄入会减弱运动时的全身脂肪氧化，并且可能会抑制肥胖青少年的脂肪代谢。为了确定CHO 摄入对肥胖男孩亚极量运动期间底物利用的影响，7 名肥胖男孩（平均年龄：11.4 ± 1.0 岁；%体脂：35.8 ± 3.9%）以接近最大脂肪氧化的强度进行了 60 分钟的运动。以双盲、对照的方式摄入 CHO 饮料（CARB）或安慰剂饮料（CONT）。在运动的最后 20 分钟计算总脂肪、总 CHO 和外源性 CHO（CHO(exo)）的氧化率。在 CONT 期间，脂肪氧化率为 3.9 ± 2.4 mg×kg 去脂体重（FFM）(-1)×min(-1)，占总能量消耗（EE）的 43.1 ± 22.9%。在 CARB 期间，脂肪氧化降低（p = 0.02）至 1.7 ± 0.6 mg×kg FFM(-1)×min(-1)，占 EE 的 19.8 ± 4.9%。CARB 和 CONT 期间的总 CHO 氧化率分别为 17.2 ± 3.1 mg×kg FFM(-1)和 13.2 ± 6.1 mg×kg FFM(-1)（p = 0.06）。在 CARB 中，CHO(exo)氧化贡献了 EE 的 23.3 ± 4.2%。CHO 摄入在肥胖男孩运动期间明显抑制脂肪氧化。
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