Effects of liquid carbohydrate/essential amino acid ingestion on acute hormonal response during a single bout of resistance exercise in untrained men
Effects of liquid carbohydrate/essential amino acid ingestion on acute hormonal response during a single bout of resistance exercise in untrained men
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DOI：
10.1016/j.nut.2005.11.005
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发表时间：
2006-04-01
期刊：
影响因子：
4.4
通讯作者：
Marino, FE
中科院分区：
文献类型：
--
作者：
Bird, SP;Tarpenning, KM;Marino, FE
目的：本研究的主要目的是调查营养干预对未经训练的年轻男性对单次抗阻运动的急性激素反应的影响。具体来说，目的是确定是否可以创建有利于增强骨骼肌肥大对阻力训练的适应的急性激素环境。皮质醇在抑制训练引起的肌肉生长方面的潜在作用特别令人感兴趣，运动引起的皮质醇释放是否可以通过营养干预来减弱。方法：在禁食 4 小时后，32 名受试者进行了单次阻力运动（类似于 60 分钟），在此期间他们消耗了 6% 碳水化合物 (CHO) 溶液、6 克必需氨基酸 (EAA) 混合物、组合的 CHO + EAA 补充剂或安慰剂饮料。在整个运动过程中、运动后立即以及运动后 15 分钟和 30 分钟每 15 分钟采集一次血样，用于分析总睾酮、皮质醇、生长激素、胰岛素和葡萄糖。结果：安慰剂组中没有观察到葡萄糖或胰岛素的显着变化。摄入 CHO 和 CHO + EAA 导致葡萄糖和胰岛素浓度显着 (P < 0.001) 增加至基线以上，而 EAA 仅导致运动后胰岛素显着增加 (P < 0.05)。安慰剂在 30 分钟内表现出皮质醇显着增加 (P < 0.01)，运动后立即峰值增加 105% (P < 0.001)，运动后 30 分钟皮质醇仍高于基线 54% (P < 0.05)。相反，治疗组在运动过程中皮质醇没有显着变化，运动后 30 分钟时 CHO 和 CHO + EAA 分别低于基线 27% (P < 0.01) 和 23% (P < 0.05)。营养干预后，运动诱发的生长激素或睾酮浓度不存在组间差异。结论：这些数据表明，在单次抗阻运动期间摄入 CHO 和/或 EAA，除了刺激胰岛素释放外，还能抑制运动诱发的皮质醇反应。我们得出的结论是，运动诱发的激素分布可能会受到营养干预的影响，从而达到更有利于合成代谢的分布。 (c) 2006 Elsevier Inc. 保留所有权利。
Objective: The primary objective of this study was to investigate the influence of nutritive interventions on acute hormonal responses to a single bout of resistance exercise in untrained young men. Specifically, the aim was to determine whether the acute hormonal milieu conducive to enhancing skeletal muscle hypertrophic adaptation to resistance training could be created. The potential role of cortisol in inhibiting training-induced muscle growth is of particular interest, as is whether exercise-induced cortisol release can be attenuated by nutritive interventions.Methods: After a 4-h fast, 32 subjects performed a single bout of resistance exercise (similar to 60 min), during which they consumed a 6% carbohydrate (CHO) solution, a 6-g essential amino acid (EAA) mixture, a combined CHO + EAA supplement, or a placebo beverage. Blood samples were collected every 15 min throughout the exercise bout, immediately after exercise, and 15 and 30 min after exercise for analysis of total testosterone, cortisol, growth hormone, insulin, and glucose.Results: No significant change in glucose or insulin was observed for placebo. CHO and CHO + EAA ingestion resulted in significantly (P < 0.001) increased glucose and insulin concentrations above baseline, whereas EAA resulted in significant postexercise increases (P < 0.05) in insulin only. Placebo exhibited a significant increase in cortisol within 30 min (P < 0.01), with a peak increase of 105% (P < 0.001) immediately after exercise, and cortisol remained 54% above baseline at 30 min after exercise (P < 0.05). Conversely, the treatment groups displayed no significant change in cortisol during the exercise bout, with CHO and CHO + EAA finishing 27% (P < 0.01) and 23% (P < 0.05), respectively, below baseline at 30 min after exercise. No between-group differences in exercise-induced growth hormone or testosterone concentrations after nutritive intervention were present.Conclusion: These data indicate that CHO and/or EAA ingestion during a single bout,of resistance exercise suppresses the exercise-induced cortisol response, in addition to stimulating insulin release.. We conclude that the exercise-induced hormonal profile can be influenced by nutritive interventions toward a profile more favorable for anabolism. (c) 2006 Elsevier Inc. All rights reserved.