The influence of acute exercise on sleep following high caffeine intake

Shawn D. Youngstedt, Patrick J. O'Connor, James B. Crabbe, Rod K. Dishman

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


The purpose of this study was to examine the influence of vigorous acute exercise on nocturnal sleep that had been disrupted by high doses (1200 mg) of caffeine throughout the daytime. Eight moderately fit, young males with a history of moderate caffeine use completed four conditions in a within-subjects, counterbalanced design: 60 min of (i) cycling at 60% VO(2peak) or (ii) quiet rest following placebo consumption, (iii) cycling, or (iv) quiet rest following the consumption of a high dose of caffeine. Each condition was performed twice from 1615-1715 h and followed by all-night polysomnographic recording. Subjects consumed two blinded 200-mg capsules of either lactose placebo or caffeine upon awakening, at 1600 h, and 2 h before bedtime. State anxiety was assessed at bedtime. Criterion scores consisted of the mean data across the two days in each condition. Sleep data were analyzed using a condition (exercise versus quiet rest) by drug (caffeine versus placebo) repeated-measures ANOVA. Caffeine-elicited sleep disturbance that was less than previously reported. Exercise attenuated selected sleep disturbances to a small degree. In general, the effects of exercise on sleep were not greater following caffeine compared to placebo. Indeed, increases in slow-wave sleep after exercise were approximately 1/3 smaller following caffeine treatment compared to placebo. Copyright (C) 2000 Elsevier Science Inc.

Original languageEnglish (US)
Pages (from-to)563-570
Number of pages8
JournalPhysiology and Behavior
Issue number4
StatePublished - Feb 2000
Externally publishedYes


  • Alertness
  • Anxiety
  • Behavioral treatment
  • Cycling
  • Physical activity
  • Temperature

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Behavioral Neuroscience


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