补充蛋白质不影响对阻力训练的肌源性适应。
Protein Supplementation Does Not Affect Myogenic Adaptations to Resistance Training.
作者信息
Reidy Paul T, Fry Christopher S, Igbinigie Sherry, Deer Rachel R, Jennings Kristofer, Cope Mark B, Mukherjea Ratna, Volpi Elena, Rasmussen Blake B
机构信息
1Division of Rehabilitation Sciences, University of Texas Medical Branch, Galveston, TX; 2Department of Nutrition and Metabolism, University of Texas Medical Branch, Galveston, TX; 3School of Medicine, University of Texas Medical Branch, Galveston, TX; 4Sealy Center on Aging, University of Texas Medical Branch, Galveston, TX; 5Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston, TX; 6DuPont Nutrition and Health, St. Louis, MO.
出版信息
Med Sci Sports Exerc. 2017 Jun;49(6):1197-1208. doi: 10.1249/MSS.0000000000001224.
UNLABELLED
It has been proposed that protein supplementation during resistance exercise training enhances muscle hypertrophy. The degree of hypertrophy during training is controlled in part through the activation of satellite cells and myonuclear accretion.
PURPOSE
This study aimed to determine the efficacy of protein supplementation (and the type of protein) during traditional resistance training on myofiber cross-sectional area, satellite cell content, and myonuclear addition.
METHODS
Healthy young men participated in supervised whole-body progressive resistance training 3 d·wk for 12 wk. Participants were randomized to one of three groups ingesting a daily 22-g macronutrient dose of soy-dairy protein blend (PB, n = 22), whey protein isolate (WP, n = 15), or an isocaloric maltodextrin placebo (MDP, n = 17). Lean mass, vastus lateralis myofiber-type-specific cross-sectional area, satellite cell content, and myonuclear addition were assessed before and after resistance training.
RESULTS
PB and the pooled protein treatments (PB + WP = PRO) exhibited a greater whole-body lean mass %change compared with MDP (P = 0.057 for PB) and (P = 0.050 for PRO), respectively. All treatments demonstrated similar leg muscle hypertrophy and vastus lateralis myofiber-type-specific cross-sectional area (P < 0.05). Increases in myosin heavy chain I and II myofiber satellite cell content and myonuclei content were also detected after exercise training (P < 0.05).
CONCLUSION
Protein supplementation during resistance training has a modest effect on whole-body lean mass as compared with exercise training without protein supplementation, and there was no effect on any outcome between protein supplement types (blend vs whey). However, protein supplementation did not enhance resistance exercise-induced increases in myofiber hypertrophy, satellite cell content, or myonuclear addition in young healthy men. We propose that as long as protein intake is adequate during muscle overload, the adaptations in muscle growth and function will not be influenced by protein supplementation.
未标注
有人提出，在抗阻训练期间补充蛋白质可增强肌肉肥大。训练期间的肥大程度部分通过卫星细胞的激活和肌核增加来控制。
目的
本研究旨在确定在传统抗阻训练期间补充蛋白质（以及蛋白质类型）对肌纤维横截面积、卫星细胞含量和肌核添加的效果。
方法
健康年轻男性参加为期12周、每周3天的有监督的全身渐进性抗阻训练。参与者被随机分为三组，分别每日摄入22克宏量营养素剂量的大豆 - 乳蛋白混合物（PB，n = 22）、乳清蛋白分离物（WP，n = 15）或等热量的麦芽糊精安慰剂（MDP，n = 17）。在抗阻训练前后评估瘦体重、股外侧肌肌纤维类型特异性横截面积、卫星细胞含量和肌核添加情况。
结果
与MDP相比，PB和合并的蛋白质处理组（PB + WP = PRO）的全身瘦体重百分比变化更大，PB组（P = 0.057）和PRO组（P = 0.050）。所有处理组的腿部肌肉肥大和股外侧肌肌纤维类型特异性横截面积相似（P < 0.05）。运动训练后还检测到肌球蛋白重链I和II肌纤维卫星细胞含量和肌核含量增加（P < 0.05）。
结论
与不补充蛋白质的运动训练相比，抗阻训练期间补充蛋白质对全身瘦体重有适度影响，并且蛋白质补充类型（混合物与乳清）之间对任何结果均无影响。然而，补充蛋白质并未增强年轻健康男性抗阻运动诱导的肌纤维肥大、卫星细胞含量或肌核添加增加。我们提出，只要在肌肉超负荷期间蛋白质摄入量充足，肌肉生长和功能的适应性就不会受到蛋白质补充的影响。
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