Caffeine supplementation is ergogenic in soccer players independent of cardiorespiratory or neuromuscular fitness levels.
Andreas ApostolidisVassilis MougiosIlias SmiliosMaria FrangousMarios HadjicharalambousPublished in: Journal of the International Society of Sports Nutrition (2020)
Caffeine was effective in improving endurance and neuromuscular performance in athletes with either high or medium cardiorespiratory and neuromuscular fitness. Cardiorespiratory and neuromuscular fitness do not appear to modulate the ergogenic effects of caffeine supplementation in well-trained athletes.