Texas Tech University

Research Award Highlight: Influence of Caffeinated and Non-caffeinated Pre-workout Supplements on Resistance Exercise Performance

February 3, 2021 |  

The award is sponsored by Legion Athletics, Inc.

Grant Tinsley, an assistant professor in the Department of Kinesiology & Sport Management, received an award from Legion Athletics, Inc. for the project, Influence of Caffeinated and Non-caffeinated Pre-workout Supplements on Resistance Exercise Performance. Below, Tinsley explains the project and his interest in the subject.

The proposed study is a randomized, double-blind, placebo-controlled crossover trial examining the effects of caffeinated and non-caffeinated pre-workout supplements on resistance exercise performance. Resistance-trained adults will be randomly assigned to complete three study conditions (caffeinated pre-workout, non-caffeinated pre-workout, and placebo) in one of the six possible orders. During each condition, participants will report to the laboratory for ingestion of the assigned beverage and subsequent muscular performance testing. Major performance outcomes will be force production variables from a mechanized squat device and maximal strength and muscular endurance on the bench press and leg press exercises.

Pre-workout supplements are very popular among exercising individuals and have been shown to improve some aspects of exercise performance. However, the fact that these supplements contain multiple different ingredients makes it challenging to isolate which compounds are responsible for performance improvements. Many believe that caffeine is the main reason pre-workout supplements are effective. However, many individuals who are sensitive to caffeine or exercise in the evening may wish to avoid caffeine consumption prior to exercise. So, there is also an emerging interest in stimulant-free pre-workout supplements. Our study will examine two versions of the same pre-workout supplement - one that is caffeinated and one that is non-caffeinated - to determine if similar performance improvements are seen with both formulations. Our results will help us understand the contributions of caffeine and other ingredients for improving exercise performance.