Intense Training May Reshape the Gut Microbiome

New research from Edith Cowan University suggests that the intensity of athletic training could influence the composition of the gut microbiome, potentially affecting both health and performance. The study, led by PhD researcher Bronwen Charlesson, examined how varying training loads—from intense workouts to lighter recovery periods—impact gut health markers in athletes.

Athletes often show distinct gut microbiota compared with the general population, including greater microbial diversity and higher levels of short-chain fatty acids. The research found that heavier training loads were associated with noticeable changes in bacterial populations and metabolite levels in the gut.

One possible explanation involves lactate produced during strenuous exercise. As lactate enters the bloodstream and reaches the gut, certain microbes may use it as fuel, encouraging the growth of specific bacterial species.

During lower training periods, athletes also tended to choose less nutritious foods and experienced slower digestion, both of which may further alter the gut microbiome and influence overall performance.

05-03-2026