Glutamine supplementation reduces markers of intestinal permeability during running in the heat in a dose-dependent manner

source extracted confidence: high 2026-04-09
#administration-oral #adult #dose-response-relationship-drug #fatty-acid-binding-proteins #glutamine

Glutamine supplementation reduces markers of intestinal permeability during running in the heat in a dose-dependent manner

Pugh et al., 2017 | Eur J Appl Physiol | Rct

Citation

Pugh Jamie N, Sage Stephen, ... Close Graeme L. Glutamine supplementation reduces markers of intestinal permeability during running in the heat in a dose-dependent manner. Eur J Appl Physiol. 2017-Dec;117(12):2569-2577. doi:10.1007/s00421-017-3744-4

Abstract

PURPOSE: To examine the dose-response effects of acute glutamine supplementation on markers of gastrointestinal (GI) permeability, damage and, secondary, subjective symptoms of GI discomfort in response to running in the heat. METHODS: Ten recreationally active males completed a total of four exercise trials; a placebo trial and three glutamine trials at 0.25, 0.5 and 0.9 g kg-1 of fat-free mass (FFM) consumed 2 h before exercise. Each exercise trial consisted of a 60-min treadmill run at 70% of [Formula: see text] in an environmental chamber set at 30 °C. GI permeability was measured using ratio of lactulose to rhamnose (L:R) in serum. Plasma glutamine and intestinal fatty acid binding protein (I-FABP) concentrations were determined pre and post exercise. Subjective GI symptoms were assessed 45 min and 24 h post-exercise. RESULTS: Relative to placebo, L:R was likely lower following 0.25 g kg-1 (mean difference: - 0.023; ± 0.021) and 0.5 g kg-1 (- 0.019; ± 0.019) and very likely following 0.9 g kg- 1 (- 0.034; ± 0.024). GI symptoms were typically low and there was no effect of supplementation. DISCUSSION: Acute oral glutamine consumption attenuates GI permeability relative to placebo even at lower doses of 0.25 g kg-1, although larger doses may be more effective. It remains unclear if this will lead to reductions in GI symptoms. Athletes competing in the heat may, therefore, benefit from acute glutamine supplementation prior to exercise in order to maintain gastrointestinal integrity.

Key Findings

Relative to placebo, L:R was likely lower following 0.25 g kg-1 (mean difference: - 0.023; ± 0.021) and 0.5 g kg-1 (- 0.019; ± 0.019) and very likely following 0.9 g kg- 1 (- 0.034; ± 0.024). GI symptoms were typically low and there was no effect of supplementation.

Outcomes Measured

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Population

Field Value
Population See abstract
Sample Size See abstract
Age Range See abstract
Condition See abstract

MeSH Terms

  • Administration, Oral
  • Adult
  • Dose-Response Relationship, Drug
  • Fatty Acid-Binding Proteins
  • Glutamine
  • Hot Temperature
  • Humans
  • Intestinal Absorption
  • Intestines
  • Lactose
  • Male
  • Rhamnose
  • Running

Evidence Classification

  • Level: Rct
  • Publication Types: Journal Article, Randomized Controlled Trial
  • Vertical: glutamine-gut

Provenance

Source extracted via PubMed E-utilities API on 2026-04-09