Effects of Caffeine on Rugby League Players and Performance
The Effect of Caffeine on Repeat-High-Intensity-Effort Performance in Rugby League Players
It was found that pre-exercise ingestion of 300 mg caffeine produced practically meaningful improvements in RHIE performance in rugby league players.
Brandon M. Wellington et al, International Journal of Sports Physiology and Performance ,Volume 12: Issue 2 Pages: 206–210, 2017
