Abstract
2086 PURPOSE: The aim of the investigation was to examine the effects of high-volume resistance exercise (HVRE) on cortisol and testosterone (TEST) responses, and determine whether or not the ingestion of carbohydrate (CHO) could affect those endrocrine responses. METHODS: Nine male track and field athletes (age 21.11 ± 1.36 yr), with a minimum of 2 years of weight lifting experience performed resistance exercise sessions: six sets of leg press and lat pull-downs, and six sets of bench press and leg curls. All exercises included two warm-up sets of 10 repetitions at 35% and 45% of 1-RM, and four sets of 10 repetitions at 55% of 1-RM. The exercises were performed with a 3:2 cadence followed by 1 minute of rest between sets. Average exercise session duration was 52.30 min (± 1.60). Following a counterbalanced doubleblind research design, subjects consumed either CHO or placebo (P) beverage prior to, during, and immediately following the weight lifting session in a volume to deliver CHO at 1 g per kg of body weight. RESULTS: No treatment effects were observed for any of the analytes. Plasma lactate increased significantly (p < 0.05) from baseline (1.41 ± 0.09 mmol/L) to immediately post-exercise (13.22 ± 0.85 mmol/L). Serum cortisol at 90 min into recovery (13.34 ± 1.23 ug/dl) was significantly (p < 0.05) lower than that at immediately post-exercise (17.36 ± 1.36 ug/dl) and baseline (16.29 ± 0.70 ug/dl) values. Serum TEST increased significantly (p < 0.05) immediately postexercise (885.26 ± 80.07) as compared to baseline (752.00 ± 54.85). However, when the serum TEST was corrected for plasma volume (PV) changes, there were no significant differences (p > 0.05). CONCLUSIONS: HVRE did not induce significant alterations in serum TEST when corrected for PV changes; however, serum cortisol declined at 90 min into recovery. CHO supplementation exerted no significant effects on serum TEST or serum cortisol. Drinks were donated by Powerade.
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