The Physiological and Cognitive Performance
The Physiological and Performance Effects of Caffeine Gum Consumed During A Simulated Half-Time By Professional Academy Rugby Union Players
It was found that chewing caffeine gum increased the salivary testosterone concentrations of professional rugby union players over a simulated half-time. Practitioners may therefore choose to recommend caffeine gum between successive exercise bouts due to the increases in salivary testosterone observed; a variable associated with increased motivation and high-intensity exercise performance.
Russell M, Reynolds N A, Crewther B T, Cook C J, Kilduff L
Journal of Strength and Conditioning Research 2017 November 27
