消费乳清蛋白与添加的必需氨基酸,而不是碳水化合物,保持了运动后的合成代谢,而营养不良
Jess A Gwin1, David D Church2, Jillian T Allen1
1Military Nutrition Division, U.S. Army Research Institute of Environmental Medicine, Natick, MA.
Medicine and science in sports and exercise
|August 20, 2024
概括
运动后补充必需氨基酸 (EAA),而不是碳水化合物,有助于在能量不足期间维持肌肉蛋白质合成 (MPS). 这种策略支持肌肉类解体,即使减少卡路里摄入量.
科学领域:
- 运动生理学 运动生理学
- 营养生物化学 营养生物化学
- 体育科学 运动科学 运动科学
背景情况:
- 能量缺乏可能会损害肌肉蛋白质合成 (MPS),可能是由于必需氨基酸 (EAA) 需求增加.
- 目前尚不清楚来自非源的补充能量或EAA的增加是否可以在能源赤字期间克服合成代谢抵抗.
研究的目的:
- 调查EAA对碳水化合物的补充能量对运动后MPS和全身蛋白质周转率的影响.
- 为了确定增加EAA供应是否可以在能量赤字期间保持肌肉类解体.
主要方法:
- 一项涉及17名成年人的随机研究,他们接受了两种5天的能量条件:能量平衡 (BAL) 和30%的能量赤字 (DEF).
- 参与者在运动后摄入了EAA (+EAA) 或附加碳水化合物 (+CHO) 的EAA丰富乳清蛋白.
- 使用同位素动力学测量肌肉蛋白质合成 (MPS),蛋白质合成 (PS),蛋白质分解 (PB) 和净平衡 (NET).
主要成果:
- 运动后的MPS显著更大,在+EAA与+CHO相比,在能量赤字期间 (P=0.015).
- 在两个能量条件下 (+EAA) 的蛋白质合成 (PS) 率高于 (+CHO) (P < 0.001).
- 蛋白质分解 (PB) 较低,净蛋白质平衡 (NET) 在+EAA补充剂 (P < 0.001) 中显著增加.
结论:
- 用额外的EAA,而不是碳水化合物补充EAA丰富的乳清蛋白,在能量不足期间有效地保持运动后MPS.
- 这种EAA策略支持肌肉类解体,达到与能量平衡期间相似的速度.
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