19. Impact of Caffeine on Strength and Endurance

Ella Knight Hanover College
Faculty Sponsor(s): Bryant Stamford Hanover College
Caffeine is a well-established ergogenic aid believed to increase strength and muscular endurance. An increase in strength suggests a centralized impact, or an “outflow” effect on the central nervous system (CNS). An increase in muscular endurance suggests an impact of caffeine on peripheral factors such as the myoneural junction or others that locally impact muscular contractions. The present study was conducted to determine the predominant impact of caffeine, either on central or peripheral factors that govern muscular contraction, or both. This study was conducted with approval from the Hanover College Human Subjects Institutional Review Board. Methods: Six Hanover College females, all regular caffeine consumers participated in three randomly assigned trials, placebo, caffeine, or control. Caffeine was administered via Vivarin caffeine tablets in a dosage of 6 mg/kg body weight. Placebo dosage was similar in composition and comprised of vitamin C tablets. In each session, a Cybex dynamometer was employed, and isometric contractions were performed to test strength, and 50 rapid isokinetic contractions were performed to test muscular endurance. Results: Data collection is in progress and nearing completion. Pilot data and initial findings have demonstrated considerable increases in strength and muscular endurance in the caffeine trial when compared to control. A slight increase in strength and muscular endurance was observed in the placebo trial, suggesting a psychological effect. Overall, the observed improvement in muscular strength was greater than endurance, suggesting that the CNS may play a more dominant role in offsetting fatigue when ingesting caffeine.
Pharmacy, Health Sciences, & Exercise Science
Poster Presentation

When & Where

Irwin Library Lower Level