Goto Kazushige, Ishii Naokata, Mizuno Ayuko, Takamatsu Kaoru
Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan, and Institute of Sports Medicine, Bispebjerg Hospital, Copenhagen, Denmark.
J Appl Physiol (1985). 2007 Jun;102(6):2158-64. doi: 10.1152/japplphysiol.01302.2006. Epub 2007 Feb 22.
This study compared the fat metabolism between "a single bout of prolonged exercise" and "repeated bouts of exercise" of equivalent exercise intensity and total exercise duration. Seven men performed three trials: 1) a single bout of 60-min exercise (Single); 2) two bouts of 30-min exercise, separated by a 20-min rest between exercise bouts (Repeated); and 3) rest. Each exercise was performed with a cycle ergometer at 60% of maximal oxygen uptake. In the Single and Repeated trials, serum glycerol, growth hormone, plasma epinephrine, and norepinephrine concentrations increased significantly (P<0.05) during the first 30-min exercise bout. In the Repeated trial, serum free fatty acids (FFA), acetoacetate, and 3-hydroxybutyrate concentrations showed rapid increases (P<0.05) during a subsequent 20-min rest period. During the second 30-min exercise bout, FFA and epinephrine responses were significantly greater in the Repeated trial than in the Single trial (P<0.05). Moreover, the Repeated trial showed significantly lower values of insulin and glucose than the Single trial. During the 60-min recovery period after the exercise, FFA, glycerol, and 3-hydroxybutyrate concentrations were significantly higher in the Repeated trial than in the Single trial (P<0.05). The relative contribution of fat oxidation to the energy expenditure showed significantly higher values (P<0.05) in the Repeated trial than in the Single trial during the recovery period. These results indicate that repeated bouts of exercise cause enhanced fat metabolism compared with a single bout of prolonged exercise of equivalent total exercise duration.
本研究比较了“单次长时间运动”与“多次重复运动”在同等运动强度和总运动时长下的脂肪代谢情况。七名男性参与了三项试验：1）一次60分钟的运动（单次运动）；2）两次30分钟的运动，两次运动之间间隔20分钟休息时间（重复运动）；3）休息。每次运动均使用自行车测力计，运动强度为最大摄氧量的60%。在单次运动和重复运动试验中，血清甘油、生长激素、血浆肾上腺素和去甲肾上腺素浓度在首次30分钟运动期间显著升高（P<0.05）。在重复运动试验中，血清游离脂肪酸（FFA）、乙酰乙酸和3-羟基丁酸浓度在随后20分钟的休息期内迅速升高（P<0.05）。在第二次30分钟运动期间，重复运动试验中的FFA和肾上腺素反应显著大于单次运动试验（P<0.05）。此外，重复运动试验中的胰岛素和葡萄糖值显著低于单次运动试验。在运动后的60分钟恢复期内，重复运动试验中的FFA、甘油和3-羟基丁酸浓度显著高于单次运动试验（P<0.05）。在恢复期，重复运动试验中脂肪氧化对能量消耗的相对贡献显著高于单次运动试验（P<0.05）。这些结果表明，与同等总运动时长的单次长时间运动相比，多次重复运动可增强脂肪代谢。
