Transient energy deficit induced by exercise increases 24-h fat oxidation in young trained men
Transient energy deficit induced by exercise increases 24-h fat oxidation in young trained men
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DOI：
10.1152/japplphysiol.00697.2014
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发表时间：
2015-01-01
影响因子：
3.3
通讯作者：
Tokuyama, Kumpei
中科院分区：
文献类型：
--
作者：
Iwayama, Kaito;Kawabuchi, Ryosuke;Tokuyama, Kumpei
运动时全身脂肪氧化增加。然而，一天24小时的脂肪氧化通常与久坐不动的一天相似，当能量摄入增加以达到能量平衡的状态时。目前的研究旨在研究一天中进行运动的时间对24小时脂肪氧化的影响。作为运动影响24小时脂肪氧化的潜在机制，我们研究了其与运动引起的短暂性能量缺陷的关系。9名年轻的男性耐力运动员使用代谢室进行了三次间接量热试验，其中他们在早餐前（AM）和午餐后（PM）进行了一次100分钟的运动，或者在早餐前和午餐后（AM/PM）进行了两次50分钟的运动，运动量为最大摄氧量的65%。试验餐的设计是为了实现个体能量平衡。24小时能量消耗相似，但AM、AM/PM和PM的24小时脂肪氧化量依次为1142 +/- 97、809 +/- 88和608 +/- 46 kcal/24 h （P < 0.05）。PM、AM/PM和AM的24小时碳水化合物氧化分别为2,558 +/- 110、2,374 +/- 114和2,062 +/- 96 kcal/24 h。在24 h的能量平衡状态下，运动引起了短暂的能量赤字，其程度与24 h脂肪氧化呈负相关（r = -0.72, P < 0.01）。同样，运动后短暂碳水化合物赤字与24小时脂肪氧化呈负相关（r = -0.40, P < 0.05）。运动时间影响24小时脂肪氧化，运动后的短暂能量/碳水化合物赤字是影响24小时脂肪氧化的一个因素。
Whole body fat oxidation increases during exercise. However, 24-h fat oxidation on a day with exercise often remains similar to that of sedentary day, when energy intake is increased to achieve an energy-balanced condition. The present study aimed to examine a possibility that time of the day when exercise is performed makes differences in 24-h fat oxidation. As a potential mechanism of exercise affecting 24-h fat oxidation, its relation to exercise-induced transient energy deficit was examined. Nine young male endurance athletes underwent three trials of indirect calorimetry using a metabolic chamber, in which they performed a session of 100 min of exercise before breakfast (AM), after lunch (PM), or two sessions of 50 min of exercise before breakfast and after lunch (AM/PM) at 65% of maximal oxygen uptake. Experimental meals were designed to achieve individual energy balance. Twentyfour- hour energy expenditure was similar among the trials, but 24-h fat oxidation was 1,142 +/- 97, 809 +/- 88, and 608 +/- 46 kcal/24 h in descending order of its magnitude for AM, AM/PM, and PM, respectively (P < 0.05). Twenty-four-hour carbohydrate oxidation was 2,558 +/- 110, 2,374 +/- 114, and 2,062 +/- 96 kcal/24 h for PM, AM/PM, and AM, respectively. In spite of energy-balanced condition over 24 h, exercise induced a transient energy deficit, the magnitude of which was negatively correlated with 24-h fat oxidation (r = -0.72, P < 0.01). Similarly, transient carbohydrate deficit after exercise was negatively correlated with 24-h fat oxidation (r = -0.40, P < 0.05). The time of the day when exercise is performed affects 24-h fat oxidation, and the transient energy/carbohydrate deficit after exercise is implied as a factor affecting 24-h fat oxidation.