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Caffeine, performance, and metabolism during repeated Wingate exercise tests

F Greer1, C McLean, T E Graham

  • 1Department of Human Biology and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada N1G 2W1.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 7, 1998
PubMed
Summary

Caffeine supplementation did not enhance power output during repeated high-intensity Wingate sprints in recreationally active men. While plasma epinephrine increased, caffeine negatively impacted later exercise bouts and showed no ergogenic effect.

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Area of Science:

  • Exercise Physiology
  • Sports Nutrition
  • Human Performance

Background:

  • Limited research exists on caffeine's ergogenic and metabolic effects during repeated high-intensity exercise.
  • Previous studies have yielded inconsistent findings regarding caffeine's impact on performance in such protocols.

Purpose of the Study:

  • To investigate the ergogenic and metabolic effects of caffeine supplementation during repeated bouts of short-term, high-intensity exercise.
  • To determine if caffeine influences power output, substrate utilization, and key metabolic markers during intense exercise protocols.

Main Methods:

  • Nine recreationally active men completed four 30-second Wingate sprints with 4-minute rest intervals on two separate occasions.
  • Subjects ingested either placebo or caffeine (6 mg/kg) one hour prior to exercise.

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  • Measurements included power output, plasma epinephrine, blood lactate, oxygen consumption, and ammonia concentration.

    • Main Results:

    • Caffeine did not affect power output in the initial Wingate tests but negatively impacted performance in the latter two bouts.
    • Plasma epinephrine levels increased post-ingestion but normalized during exercise.
    • No significant effects of caffeine were observed on blood lactate, oxygen consumption, or aerobic contribution.
    • Plasma ammonia concentration increased significantly after the second Wingate test in the caffeine trial compared to placebo.

    Conclusions:

    • Caffeine supplementation does not provide an ergogenic benefit for power output during repeated short-term, high-intensity exercise.
    • Caffeine does not appear to enhance anaerobic metabolism, with the exception of elevated ammonia levels.
    • The findings suggest potential detrimental effects of caffeine on performance in repeated high-intensity exercise bouts.