Skill execution and sleep deprivation: effects of acute caffeine or creatine supplementation - a randomized placebo-controlled trial.

J Int Soc Sports Nutr · 2011 · PMC3049131 · PMID 21324203

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did not reach statistical significanceno p-value reported

Although salivary cortisol appeared to be elevated with sleep deprivation, this result did not reach statistical significance.

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