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Rachelle Lange, Steven Colyer, Aneisa Boehler, Ryan Bradley, & Steve Burns University of Central Missouri Department of Nutrition and Kinesiology, Warrensburg, Missouri

Recent use of pre-workout supplements has increased exponentially giving rise to the need for well controlled studies to determine if using pre-workout supplements enhances an individual’s workout. PURPOSE: The purpose of this study was to determine the acute effect a pre-workout supplement has on heart rate, mental focus, and one rep. maximum when performing a bench press. METHODS: This was a single blind study using; 12 participants who regularly exercised (11 males, 1 female) but did not already take a pre-workout supplement were studied. Variables measured were heart rate (HR), mental focus, and one rep. maximum. Participants came for a total of four visits; an introduction, a control (C) trial (water), an experimental (E) trial (single serving of Juggernaut™), and a placebo (P) trial (sugar water) was ingested. RESULTS: Mean values for 1RM were C= 89.02 kg ± 24.90 kg; E=94.50 kg ± 27.05 kg; P= 92.42 kg ± 26.54 kg. Mean values for HR were C=125.83 ± 19.68 bpm; E= 136.333 ±18.41; P= 132.75 ±17.96. Mean values for mental focus were C= 95.917% ± 6.156%; E= 97.625% ± 3.724; P= 97.292% ± 2.701%. CONCLUSION: These results suggest that an individual’s heart rate, mental focus, and one rep maximum on bench press will increase after taking the pre-workout supplement.

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