Previous studies showed that collagen peptide supplementation along with resistance exercise enhance muscular recovery and function. Yet, the efficacy of collagen peptide supplementation in addition to standard nutritional practices in athletes remains unclear. Therefore, the objective of the study was to compare the effects of combined collagen peptide (20 g) and whey protein (25 g) supplementation with a similar daily protein dose (45 g) of whey protein alone on indices of muscle damage and recovery of muscular performance during eccentric exercise training. Young fit males participated in a 3-week training period involving unilateral eccentric exercises for the knee extensors. According to a double-blind, randomized, parallel-group design, before and after training, they received either whey protein (n = 11) or whey protein + collagen peptides (n = 11). Forty-eight hours after the first training session, maximal voluntary isometric and dynamic contraction of the knee extensors were transiently impaired by ∼10% (Ptime < .001) in whey protein and whey protein + collagen peptides, while creatine kinase levels were doubled in both groups (Ptime < .01). Furthermore, the training intervention improved countermovement jump performance and maximal voluntary dynamic contraction by respectively 8% and 10% (Ptime < .01) and increased serum procollagen type 1N-terminal peptide concentration by 10% (Ptime < .01). However, no differences were found for any of the outcomes between whey and whey protein + collagen peptides. In conclusion, substituting a portion of whey protein for collagen peptide, within a similar total protein dose, improved neither indices of eccentric muscle damage nor functional outcomes during eccentric training.

中文翻译：

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在健康男性的离心运动训练中，用部分乳清替代胶原蛋白肽补充剂既不能改善肌肉损伤指数，也不能改善功能能力的恢复。

先前的研究表明，补充胶原蛋白肽和抗阻运动可以增强肌肉恢复和功能。然而，除了标准营养实践之外，补充胶原蛋白肽对运动员的功效仍不清楚。因此，本研究的目的是比较胶原蛋白肽（20 克）和乳清蛋白（25 克）的组合补充与类似的每日蛋白质剂量（45 克）单独乳清蛋白对肌肉损伤指数和肌肉恢复的影响。离心运动训练期间的肌肉表现。年轻健康的男性参加了为期三周的训练，其中包括膝关节伸肌的单侧离心练习。根据双盲、随机、平行组设计，在训练前后，他们接受乳清蛋白（n = 11）或乳清蛋白+胶原蛋白肽（n = 11）。第一次训练后 48 小时，乳清蛋白和乳清蛋白 + 胶原蛋白肽中膝关节伸肌的最大自主等长收缩和动态收缩短暂受损约 10% (Ptime < .001)，而肌酸激酶水平在两组（Ptime < .01）。此外，训练干预将反向运动跳跃表现和最大自主动态收缩分别提高了 8% 和 10% (Ptime < .01)，并使血清 1N 型前胶原蛋白浓度增加了 10% (Ptime < .01)。然而，乳清和乳清蛋白+胶原蛋白肽之间没有发现任何结果差异。总之，在相似的总蛋白质剂量下，用部分乳清蛋白代替胶原蛋白肽，既没有改善离心训练期间的离心肌肉损伤指数，也没有改善功能结果。