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Effect of lactate consumption on exercise performance

R W Bryner1, W G Hornsby, R Chetlin

  • 1Department of Exercise Physiology, Morgantown, WV 26506-6116, USA.

The Journal of Sports Medicine and Physical Fitness
|October 9, 1998
PubMed
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Oral lactate supplementation does not enhance endurance exercise performance or peak power in trained cyclists. This study found no significant differences in performance metrics when comparing carbohydrate drinks with and without added lactate.

Area of Science:

  • Exercise Physiology
  • Sports Nutrition
  • Biochemistry

Background:

  • Maintaining plasma glucose is crucial for endurance performance.
  • Gluconeogenesis and carbohydrate intake replenish glucose after glycogen depletion.
  • Lactate serves as a gluconeogenic precursor and blood buffer.

Purpose of the Study:

  • To investigate the effects of an 8% carbohydrate (CHO) sports drink, with and without 2% lactate (L), on endurance performance.
  • To assess the impact on peak power and the delay of blood acidosis during intense exercise.
  • To determine if lactate supplementation influences key metabolic markers.

Main Methods:

  • Seven trained cyclists completed a double-blind, randomized study with four separate exercise tests.
  • Participants consumed either a placebo, 2% lactate, 8% carbohydrate, or 8% carbohydrate + 2% lactate drink every 20 minutes.

Related Experiment Videos

  • Performance was measured by time to exhaustion and peak power during a Wingate test, with blood samples analyzed for metabolic markers.

    • Main Results:

    • No significant differences were found in total exercise time or peak power among the different drink conditions.
    • Blood analysis revealed no significant variations in insulin, glucose, pH, or bicarbonate levels post-exercise across the groups.
    • Lactate supplementation, alone or with carbohydrates, did not alter key performance or metabolic outcomes.

    Conclusions:

    • Oral supplementation with lactate does not appear to affect exercise performance in trained cyclists.
    • The addition of lactate to a carbohydrate sports drink does not provide additional benefits for endurance or power output.
    • Further research may be needed to explore potential ergogenic effects of lactate under different exercise conditions or populations.