Measuring the Effects of Pre-Workout Supplementation on Resting Metabolism over Time


Harper, R., Anton, J., Torre, A., Lafferty, M. Delaware Technical Community College, Wilmington, DE

Purpose: Use of dietary supplements before strength and aerobic activities is claimed to increase energy, strength, and focus. This study is an expansion of a previous study, “Measuring the Effects of Pre-Workout Supplementation on Resting Metabolic Rate” (Harper, et al), and was conducted to measure changes in resting metabolic rate [RMR], respiratory quotient [R], and macro nutrients utilized over time after ingestion of a pre-workout stimulant. Methods: All results were gathered with a Cosmed Quark PFT Ergo. Testing protocol required that subjects refrain from vigorous physical activity 24 hours prior to testing as well as fast for 8 hours prior to testing. A baseline RMR test was conducted at the start of each testing day. Immediately following the baseline test, subjects were given 2 scoops (11.4g) of pre-workout supplement mixed with 10oz of water. After 20 minutes of digestion up to four RMR post-tests were conducted, each separated by a 20 minute break. These tests were repeated for each subject on as many as four separate days. Results: Test data shows a 12.20% average increase in RMR, an average increase of 0.135 in R value, and an average 25.19% increase in carbohydrate utilization immediately following supplementation. Conclusions: As hypothesized in the previous pilot study: ingestion of a pre-workout stimulant may increase available energy by way of stimulating glycogenolysis to produce ATP. All subjects displayed an increase in RMR, R value, and carbohydrate utilization after supplementation. This was followed by a gradual return to baseline measurements in each area over the course of testing with the exception of RMR.

Funding for this project was provided by NIH NCRR INBRE, grant to Delaware 2P20RR016472

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