The International Journal of Sport Nutrition and Exercise Metabolism published by Human Kinetics has examined whether carbohydrate-protein ingestion influences muscle glycogen metabolism during short-term recovery from exhaustive treadmill running and subsequent exercise.
Six endurance-trained individuals underwent two trials in a randomised double-blind design, each involving an initial run-to-exhaustion at 70% VO2max (Run-1) followed by 4-hour recovery and subsequent run-to-exhaustion at 70% VO2max (Run-2).
Beverages were ingested at 30-min intervals during recovery, one group had a drink consuming carbohydrate-protein (0.8 g carbohydrate·kg body mass [BM-1]·h-1 plus 0.4 g protein·kg BM-1·h-1) this we will call CHO-P. The other had isocaloric carbohydrate (1.2 g carbohydrate·kg BM-1·h-1) which we will call CHO.
The results found that the addition of protein did not alter muscle glycogen utilisation or time to fatigue during repeated exhaustive running.