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Capsaicin Supplementation during High-intensity Continuous Exercise: A Double-blind Study.

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Acute capsaicin supplementation did not improve endurance performance in runners during high-intensity exercise. This study found no significant changes in time to exhaustion or key physiological markers with capsaicin use.

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Area of Science:

  • Exercise Physiology
  • Nutritional Supplementation

Background:

  • Capsaicin, a compound found in chili peppers, has been explored for its potential ergogenic effects.
  • Its impact on physiological responses and endurance performance during high-intensity exercise requires further investigation.

Purpose of the Study:

  • To determine the effect of acute capsaicin supplementation on time to exhaustion.
  • To assess physiological responses and energy system contributions during continuous high-intensity exercise in runners.

Main Methods:

  • Fifteen recreationally-trained runners participated in a randomized, double-blind, placebo-controlled trial.
  • Participants performed high-intensity exercise at 90% V̇O2peak after consuming capsaicin or placebo.
  • Evaluated metrics included time to exhaustion, V̇O2peak, lactate, heart rate, and perceived exertion.

Main Results:

  • No significant differences were observed between capsaicin and placebo for time to reach V̇O2peak, peak blood lactate, or time to exhaustion.
  • End-of-exercise heart rate and rate of perceived exertion (RPE) also showed no significant variations.
  • Capsaicin supplementation did not alter key physiological responses during the high-intensity exercise bout.

Conclusions:

  • Acute capsaicin supplementation does not enhance time to exhaustion in runners performing continuous high-intensity exercise.
  • Capsaicin did not significantly affect the measured physiological responses or energy system contributions during this type of exercise.