Effect of combined carbohydrate-protein ingestion on markers of recovery after simulated rugby union match-play

In this study, we investigated the effect of ingesting carbohydrate alone or carbohydrate with protein on functional and metabolic markers of recovery from a rugby union-specific shuttle running protocol. On three occasions, at least one week apart in a counterbalanced order, nine experienced male rugby union forwards ingested placebo, carbohydrate (1.2 g kg body mass⁷¹ h⁷¹) or carbohydrate with protein (0.4 g kg body mass⁷¹ h⁷¹) before, during, and after a rugby union-specific protocol. Markers of muscle damage (creatine kinase: before, 258+ 171 U L⁷¹ vs. 24 h after, 574+ 285 U L⁷¹; myoglobin: pre, 50 +18 vs. immediately after, 210+ 84 nmol L⁷¹; P5 0.05) and muscle soreness (1, 2, and 3 [maximum soreness 1/48] for before, immediately after, and 24 h after exercise, respectively) increased. Leg strength and repeated 6-s cycle sprint mean power were slightly reduced after exercise (93% and 95% of pre-exercise values, respectively; P50.05), but were almost fully recovered after 24 h (97% and 99% of pre-exercise values, respectively). There were no differences between trials for any measure. These results indicate that in experienced rugby players, the small degree of muscle damage and reduction in function induced by the exercise protocol were not attenuated by the ingestion of carbohydrate and protein.