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Acute L-glutamine ingestion does not improve maximal effort exercise

M D Haub1, J A Potteiger, K L Nau

  • 1Exercise Physiology Laboratory, University of Kansas, Lawrence 66045, USA.

The Journal of Sports Medicine and Physical Fitness
|November 27, 1998
PubMed
Summary

Acute L-glutamine (GLN) ingestion did not improve acid-base balance or high-intensity exercise performance in trained males. This study found no significant ergogenic effect of GLN supplementation on endurance.

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Area of Science:

  • Exercise Physiology
  • Nutritional Biochemistry
  • Sports Science

Background:

  • L-glutamine (GLN) is hypothesized to possess ergogenic properties due to its potential to generate a base.
  • Investigating GLN's impact on acid-base balance and exercise performance is crucial for understanding its physiological effects.

Purpose of the Study:

  • To determine if L-glutamine (GLN) ingestion influences acid-base balance during high-intensity exercise.
  • To assess the effect of GLN supplementation on exercise performance in trained males.

Main Methods:

  • Ten trained males underwent maximal intensity cycle ergometer tests.
  • Participants ingested either L-glutamine (GLN) or a placebo (PLC) 90 minutes prior to exercise.
  • Blood samples were analyzed for pH, bicarbonate, and lactate levels, and time to fatigue was recorded.

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Main Results:

  • No significant differences in blood pH, bicarbonate concentration, or lactate levels were observed between GLN and placebo conditions.
  • Time to fatigue during the final exercise bout was not significantly different between the GLN and placebo trials.

Conclusions:

  • Acute L-glutamine (GLN) ingestion does not appear to enhance the buffering capacity of the body.
  • GLN supplementation did not improve high-intensity exercise performance in this cohort of trained males.