Conclusions
Protein supplementation––40 g of casein before sleep or during the afternoon––seems to provide no beneficial effects compared to an isoenergetic carbohydrate placebo on makers of recovery, performance, or body composition during a six-day training camp in professional cyclists that were already consuming a high-protein diet (>2.5 g/kg per day). Further research is needed to confirm whether this strategy could have beneficial effects on endurance athletes with a lower dietary protein intake.