Caffeine Supplementation, Resistance Training and Blood Antioxidant Status

Acute Effects of Caffeine Supplementation on Resistance Training Volume and Blood Antioxidant Status in Resitance Trained Men

The purpose of this study is to verify the effect of acute caffeine intake on resistance training volume and blood antioxidant status, in a randomised, double-blind, placebo-controlled crossover trial.

Caffeine is one of the most commonly consumed psychoactive substances in the world. Several previous studies confirmed that caffeine improves several aspects of exercise performance, including resistance training outcomes. Interestingly, caffeine and its catabolic products, theobromine and xanthine, exhibit antioxidant and prooxidant properties. Additionally, resistance training promotes the generation of reactive oxygen species, which are important for the cellular adaptation process.

Hovewer, to the best of our knowledge, there is no information as to how caffeine combined with resistance training affects blood antioxidant status. Therefore, the aim of this study was to examine acute effects of caffeine supplementation on resistance training volume and blood antioxidant status in resistance trained men.

Inclusion Criteria:

• written consent to participate,
• medical permission by physician
• "resistance-trained," defined as having a minimum of two years of resistance training experience
• minimum of 2 workout sessions per week in the last 6 months

Exclusion Criteria:

• neuromuscular or musculoskeletal disorders
• current injury
• using any medications, dietary supplements or ergogenic aids which could potentially affect the study outcomes
• a positive smoking status
• potential allergy to caffeine