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EFFECTS OF YOHIMBINE HYDROCHLORIDE SUPPLMENTATION ON EXPLOSIVE BENCH PRESS PERFORMANCE AND STRENGTH-ENDURANCE

Abstract

Lauren Boag, Hope Sternenberg, Rebecca R. Rogers, Tyler D. Williams, Christopher G. Ballmann, FACSM. Samford University, Birmingham, AL.

BACKGROUND: Yohimbine hydrochloride (YHM) is an alpha-2-adrenergic receptor antagonist which has sympathomimetic properties. While it has been previously investigated for weight loss, few studies have investigated YHM the context of resistance exercise. PURPOSE: The purpose of this study was to examine the effects of acute YHM ingestion on bench press power, velocity, and repetition volume. METHODS: In a double-blinded crossover design, resistance trained males (n=11; ages 18-24) participated in two separate bench press trials each with a different single-dose treatment: Placebo (PL; gluten free corn starch) or Yohimbine Hydrochloride (YHM; 2.5 mg). In each trial, participants consumed their respective treatment 20 minutes prior to exercise. Following a warm-up, participants completed 1 set × 2 repetitions as explosively as possible while a linear position transducer monitored mean power and velocity. Participants then completed 3 sets × Repetitions to failure (RTF) at 75% of 1-RM separated by 2 minutes of rest. Motivation to exercise was measured post-exercise using a visual analog scale. Total RTF, mean velocity, mean power, and motivation were compared and analyzed. RESULTS: Total RTF was not significantly different between PL and YHM trials (p= 0.269; d= 0.29). Mean power (p=0.472; d= 0.16) and mean velocity (p= 0.297; d= 0.25) were unchanged by treatment. Motivation to exercise was significantly higher with YHM ingestion versus PL (p=0.029; d= 0.61) CONCLUSIONS: Current findings suggest that YHM consumption does not provide ergogenic benefit during explosive bench press exercise. However, YHM results in higher levels of motivation to exercise. YHM ingestion may therefore be useful for athletes or competitors seeking to improve feelings of motivation but may not benefit resistance exercise performance.

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