Background The aim of this study is to explore the effects of ingesting protein supplementation before endurance exercise. Methods 10 recreationally active male runners (VO 2max : 53.61±3.86 ml/kg•min) completed a run-to-exhaustion test three times. Each test involved 90 minutes of running at 70% VO 2max , followed by a time to exhausted test for running at 80% VO 2max . All subjects ingested three different, randomly assigned, supplement before the first phase. At the end of the first phase, CHO (carbohydrate) + CHO; PRO (protein) + CHO; CHO + PRO. Both carbohydrate and protein were supplemented at 0.4g•kg − 1 BM − 1 . Blood samples were obtained before, immediately after and 24 h after exercise for alanine aminotransferase (ALT), aspartate aminotransferase (AST), creatine kinase (CK), and myoglobin (MB). Results Three different supplement regimens did not cause a significant difference in exhaustion time (CHO + CHO: 432.36 ± 225.51s; PRO + CHO: 463.82 ± 227.45s; CHO + PRO: 461.45 ± 248.5s). However, ALT and AST in PRO + CHO were significantly lower than CHO + CHO 24h after exercise (ALT: 16.8 ± 6.31 VS. 24.39 ± 2.54 U/L; AST: 24.06 ± 4.77 VS. 31.51 ± 7.53 U/L, p < 0.05), and MB in PRO + CHO and CHO + PRO were significantly lower than CHO + CHO 24 h after exercise (40.71 ± 15.16; 38.12 ± 14.32; 64.32 ± 28.86 ng/mL, respectively, p < 0.05). Compared to CHO + CHO, CK in PRO + CHO increased less 24 h after exercise (404.22 ± 75.31 VS. 642.33 ± 68.57 U/L, p < 0.05). Conclusion Although combined carbohydrate and protein supplementation did not prolong exhaustion time, it can effectively relieve muscle damage, and it is better to supplement PRO before exercise.
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Liang et al. (2021) studied this question.