Effekt av kolhydrat + BCAA på hormonrespons efter styrketräning

[King Grub]

The purpose of this investigation was to examine the individual and combined effects of ingesting carbohydrates (CHO) and branched chain amino acids (BCAA) during high volume upper-body resistance exercise (RE) on markers of catabolism and performance. Thirteen resistance trained males completed four experimental trials with supplementation ingesting beverages containing CHO, BCAA, CHO+BCAA, or placebo (PLA) in a randomized, double-blind design. The beverages were ingested in 118 mL servings six times during a ~60 min RE session consisting of bench press, bent-over row, incline press, and close-grip row. Each RE was performed with five sets of repetitions at 65% one-repetition max until volitional fatigue. Blood samples were collected at baseline, immediately and 60-min post-exercise to assess glucose and insulin. Cortisol was assessed immediately and 60-min post exercise. No significant performance benefits were observed for any RE. CHO+BCAA (152.4 ± 71.4 ng/mL) resulted in the lowest cortisol levels, which was lower than BCAA and PLA (193.7 ± 88.5, 182.8 ± 67.5 ng/mL, p<0.05), but not different from CHO (165 ± 76.5 ng/mL, p=0.342). Post-exercise insulin concentrations were significantly higher with CHO (4.79 ± 3.4 mU/L) compared to BCAA and PLA (3.7 ± 2.0, 3.5 ± 1.8 mU/L, p<0.05), but not different from CHO+BCAA (4.3 ± 2.5 mU/L, p=0.339). There was no treatment effect for glucose, but glucose significantly increased from baseline to immediately post-exercise and significantly decreased 60-min post-exercise. Ingesting beverages containing CHO with or without BCAA during upper-body resistance exercise may promote a more favorable post-exercise catabolic environment.

Appl Physiol Nutr Metab. 2017 Dec 15. Effects of Carbohydrate and Branched Chain Amino Acid Beverage Ingestion during Acute Upper-Body Resistance Exercise on Performance and Post-Exercise Hormone Response.