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Related Experiment Video

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Caffeine supplementation improves physical performance without affecting fatigue level: a double-blind crossover

Yuri Campos1,2, Ángel Lago-Rodríguez3, Alejandro F San Juan4

  • 1Postgraduate Program of the Faculty of Physical Education and Sports of the University of Juiz de Fora, Brazil.

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Summary

Caffeine supplementation (CAFF) improved Wingate test (WT) performance and blood lactate concentrations (BLa) but did not affect neuromuscular fatigue (NMF) measured by countermovement jump (CMJ). CAFF may enable athletes to train harder and enhance recovery.

Keywords:
Countermovement jumpErgogenic aidsGlycolytic metabolismLactateSport nutritionWingate

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Area of Science:

  • Exercise Physiology
  • Sports Nutrition
  • Human Performance

Background:

  • Caffeine supplementation is widely used to enhance athletic performance.
  • Its effects on fatigue markers and high-intensity exercise capacity require further elucidation.

Purpose of the Study:

  • To investigate the effects of caffeine supplementation (CAFF) on Wingate test (WT) performance.
  • To assess the impact of CAFF on blood lactate concentrations (BLa) and neuromuscular fatigue (NMF) post-exercise.

Main Methods:

  • Double-blind, placebo-controlled crossover study with 16 participants.
  • Participants ingested 6 mg·kg-1 of CAFF or placebo (PLAC) before performing a WT.
  • Measurements included peak power, mean power, time to peak power, BLa, and countermovement jump (CMJ) performance pre- and post-exercise.

Main Results:

  • CAFF enhanced peak power (+3.22%) and mean power (+2.7%) during the WT, and improved pre-exercise CMJ peak and mean power.
  • Higher BLa levels were observed post-WT with CAFF ingestion (+13.29% at 0.5 min, +10.51% at 3.5 min).
  • Neuromuscular fatigue, indicated by reduced CMJ performance, was observed post-WT under both CAFF and PLAC conditions, with no significant difference between groups.

Conclusions:

  • Caffeine supplementation enhances high-intensity exercise capacity (WT performance) and elevates blood lactate response.
  • CAFF does not appear to exacerbate neuromuscular fatigue as measured by CMJ performance.
  • Athletes may benefit from CAFF for training with higher workloads and potentially enhancing post-exercise recovery and supercompensation.