Alyssa M. Piecko1, Samantha Mohler-Peters1, Allison Dalton1, & Taylor Collier1 Faculty

Sponsor: Steve Burns PhD 1University of Central Missouri, Warrensburg, Missouri

Pre-workout supplements have become increasingly popular over the past couple years due to claims made by manufacturers of their ability to boost exercise performance for a longer and stronger workout. The factual information based on these claims is unclear in significance to the public. PURPOSE: Therefore, the purpose of this study was to test the effects of pre-workout supplement on blood lactate levels, anaerobic capacity, anaerobic fatigue, and peak power output in recreationally trained individuals. METHODS: Nine recreationally trained males and females participated in a single-blind study and reported to the Human Performance Lab twice in one week with two days’ separation in between testing. Participants were randomly selected on the first day regarding who who would receive the supplement (SUP) and who would receive placebo (PL). Participants performed anaerobic exercise through the vertical jump, which included 3 trials to obtain highest jump, and a 30 second Wingate test, which analyzed power output and anaerobic fatigue. Blood was acquired through a finger prick and analyzed for lactate concentration by a Scout lactate analyzer directly after the cycling was completed. On the second visit, participants received opposite SUP or PL from the initial testing and performed the same anaerobic exercises. RESULTS: Significant differences were recorded for lactic acid levels (SUP: 16.2±4.7, PL: 11.5±3.5). No differences were observed for anaerobic peak power output, vertical jump, or fatigue although data for the fatigue index approached significance (SUP: 13.7± 2.91, PL: 16.1 ± 6.39). CONCLUSION: These results suggest that SUP did not improve anaerobic exercise by increasing peak power, endurance, or anaerobic fatigue, yet the SUP increased lactic acid levels. The conclusion from this data does not support the use of a pre-workout supplement prior to anaerobic work.

KEY WORDS: pre-workout supplement, Wingate, lactic acid, anaerobic exercise, peak power, anaerobic fatigue, vertical jump.

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