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Marin, Douglas P.; Figueira, Aylton J. Junior; Pinto, Luiz G.
Universidade Metodista de São Paulo, São Paulo, Brazil.
Hormonal response is related to training intensity and volume as acute adaptation to the exercise stress in trained subjects.
PURPOSE: The purpose of this study was to determine the effect of pre and post one session resistance training on serum testosterone and Triiodotironine (T3) in young men.
METHODS: We evaluated eight healthy male (22.1±2.06 years old), with at least 12-month practice time on resistance training (RT). Anthropometric variables were assessed throughout body weight (78.4±9.97 Kg) and body height (176.25±5.49 cm). Resistance training protocol included exercises for lower (leg press, leg extension and leg curl) and upper limbs (bench press, lat pull down and military press), in circuit training until the exhaustion with 3 sets; 6–8RM and alternating upper and lower limbs exercise. Rest time between sets and exercises was 10–20s, with 15 minutes as total training session. The study design assessed the work load for 6RM one day before test for each exercise. Serum hormone was determined PRE and POST training immediately after exercises (T0), 20 (T20), 40 (T40) and 60 minutes (T60) respectively. No change on diet was suggested as well no training was recommended before test. Absolute values were analyzed by One Way Anova (p <.05), post hoc Sheffé test and A% as follow in table bellow:
RESULTS: Results analysis evidenced significant increase on serum testosterone (29.42%) immediately exercise (REST-T0), with progressive decrease 26.47% between T0 and T60 after exercise. No significant difference was found from REST to T20 T40 and T60 after training. Also no significant change was observed on T3 at all measurements that tended to stability PRE and POST training.
CONCLUSION: Data suggest positive effect of resistance training on testosterone level, what allow us to hypothesize that short training stimulus may contribute to muscle anabolic responses.
©2006The American College of Sports Medicine
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