European journal of applied physiology

Endocrine response to acute resistance exercise in obese versus lean physically active men.

PMID 25633069


Resistance exercise induces a host of endocrine responses that potentiate its effects on body composition and metabolism. Excess adiposity negatively affects some hormonal responses to exercise in sedentary men. This study compared the resistance exercise (RE)-associated growth hormone (GH), insulin-like growth factor-1 (IGF-1), and testosterone responses in lean vs. obese physically active men. Ten healthy physically active obese males (body fat xa0% 36.2xa0±xa04.03, age 24.6xa0±xa03.7xa0years, mass 104.5xa0±xa015.5xa0kg, height 178.8xa0±xa06.0xa0cm) were compared to ten lean counterparts (body fat xa0% 12.7xa0±xa02.9, age 24.6xa0±xa03.7xa0years, mass 77.1xa0±xa06.4xa0kg, height 177.2xa0±xa04.8xa0cm). The muscular endurance RE protocol consisted of six sets of ten repetitions per leg of stepping onto an elevated platform (20xa0% of participant's height) while wearing a weighted-vest (50xa0% of participant's lean mass). Pre-, immediately post-exercise (IP), and three more blood samples were collected during the one-hour recovery. When accounting for baseline differences there were no group by time interactions for GH (pxa0=xa00.33); or LH (pxa0=xa00.52). Lean presented a trend towards significance for higher IGF-1 IP (pxa0=xa00.08) than obese. Testosterone IP was similar in obese and lean, but lower in obese than lean at 30xa0min into recovery (pxa0