The role of anabolic hormone secretions induced by resistance exercise in muscular adaptations

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This study examined that the impact of anabolic hormone secretions after resistance exercise on muscular adaptations. We initially investigated the relationship between exercise-induced anabolic hormone responses and muscular hypertrophy following long-term of exercise training with two separate experiments (research issue 1). Then, we focused on the influences of acute hormone responses on post-exercise recovery kinetics of muscular function (research issue 2).In research issue 1, the results showed that magnitude of growth hormone(GH) response after resistance exercise was consistent with that of muscular hypertrophy following training period. In addition, brief intra-set rest periods inserted into each set of exercise caused a suppression of GH secretion, and markedly attenuated muscular hypertrophy after long-term exercise training.In research issue 2, the results showed that magnitude of acute GH response after resistance exercise might be associated with post-exercise recovery of maximal muscular strength, suggesting that post-exercise GH secretion has a favorable effect on enhancement of protein synthesis in active muscles.These results suggest that secretions of anabolic hormones, especially that of GH, may be related to both muscular hypertrophy and enhancement of protein synthesis in active muscles during recovery period after a single exercise bout. Therefore, the exercise regimen with marked GH secretion would be effective, when aiming for muscular hypertrophy.