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THE EFFECTS OF PRE-WORKOUT ON ANAEROBIC POWER OUTPUT AND BLOOD LACTATE LEVELS

Abstract

Ashleigh E. Calcote, Tymeshia Casey, Tyler Hester, Joshua Tuttle, Steve Burns. University of Central Missouri, Warrensburg, Missouri; e-mail aec95800@ucmo.edu

Pre-workout supplementation has become a common practice among gym users and trained athletes due to claims of increased energy and endurance to achieve faster results. However, these claims have not been proven scientifically by a large variety of reliable sources. PURPOSE: The purpose of this study was to determine the effects of a pre-workout supplement on anaerobic power output, percent fatigue and blood lactate levels. METHODS: Participants included 5 males and 4 females (mean ± SD age= 21 ± .87 years). The research was conducted as a single blind study in which the subjects randomly consumed either pre-workout supplement (18 cc= 1 scoop) or a placebo (sugar free punch; ½ tbsp. cherry flavor; 1tbsp. tropical punch flavor ) for one of two, one hour sessions occurring one week apart. Thirty minutes after ingesting the supplement, peak anaerobic power output, average power output, and percent fatigue were measured using two 30 second protocol Wingate Tests per session. Blood was drawn at one and three minutes post exercise for lactate analysis. RESULTS: Subject’s peak anaerobic power after ingestion of pre-workout supplement compared to the placebo were 703.72 ± 216.67 W, 674.17 ± 188.70 W respectively. Average power output remained about the same between both the supplement and placebo with no significant difference between the two (434.83 ± 99.66 W, 434.39 ± 88.70 W). Percent fatigue was also similar between the supplement trial and placebo trial with no significant difference between the two (13.96 ± 6.17 W, 13.22 ± 5.87 W). There was no significant difference in blood lactate levels after one minute (14.45 ± 3.66 mmo/L, 14.71 ± 3.63 mmo/L) however, there was a significant difference in blood lactate levels 3 minutes post exercise (14.73 ± 4.03 mmo/L, 12.70 ± 3.47 mmo/L) when given pre-workout compared to the placebo. CONCLUSION: The hypothesis that after ingesting pre-workout supplement, anaerobic power output would increase was not supported. Blood lactate levels after three minutes were significantly higher after taking the pre-workout supplement compared to the placebo which could correlate to the higher peak anaerobic output subject’s demonstrated when given the pre-workout supplement.

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