Comparison of whey protein and carbohydrate consumption on hormonal response after resistance exercise.

Nutrition is a critical factor that influences on hormonal responses induced resistance exercise. The purpose of this study is comparison of impact of carbohydrate or protein consumption during exercise on hormonal responses following resistance exercise. Subjects of this study included that 20 untrained young men (age:22.3±3 y, bodymass: 74±5 kg) that divided randomly in two group and consumed carbohydrate (~750 ml 6% CHO beverage) or whey protein (0.2 g/kg) between a bout of resistance exercise with 75% 1 repetition maximum intensity. Blood samples were obtained pre and post exercise for determination of Cortisol, insulin, Growth Hormone (GH), Total Testosterone (TT) and insulin like Growth Factor -1 (IGF-1) concentrations. Results indicates that while cortisol significantly greater increased in PRO than CHO (17.23±4.59 vs 0.71±20.67 μg/dl, respectively, p<0.05), Insulin more increased in CHO compared PRO significantly (8.12 ±3.01 vs 4.69± 2.08, respectively, p<0.05). No significant difference was seen in GH, TT and IGF-1 for both groups. We conclude that ingestion of carbohydrate in during resistance exercise may inhibit catabolic hormone (cortisol) and increased anabolic hormone (insulin) and creating a hormonal milieu for anabolism when compared with whey protein. However in about other anabolic markers need greater investigations.