摘要：Protein supplements are consumed frequently by athletes and recreationally active players for various reasons, including improved physical performance and rehabilitation after exercise. Inclusion criteria specified recruiting healthy active athletes less than 40 years of age and evaluating the effects of protein supplements in combination on endurance performance metrics such as time-to-exhaustion, or total power output during sprint intervals. The literature search identified 15 articles, of which 18 incorporated test metrics that permitted exclusive categorization into one of the following sections: ingestion during an acute bout of physical work (n = 13) and ingestion during and after exercise to affect subsequent endurance performance (n = 17). The remaining two articles contained performance metrics that spanned male categories. Protein is among the most common nutritional supplements taken by sports person. Many studies lacked ability to evaluate effects of protein sources on muscle metabolism through determination of muscle glycogen of protein turnover, or changes in key signaling proteins, and therefore could not substantiate changes in rates of synthesis or degradation of protein. As a result, the interpretation of their data was often biased and inconclusive since they lacked ability to test the proposed underlying mechanism of action.
