Aerobic exercise training alters gut microbiota composition in middle-aged UM-HET3 mice, study shows

Researchers reported that 4 weeks of aerobic exercise significantly shifts gut microbial community composition and taxonomy in middle-aged, genetically heterogeneous mice, highlighting a potentially key biological pathway for preserving physiological function during aging.

A study published in Geroscience investigated the effects of a 4-week aerobic exercise training regimen on the gastrointestinal microbiota of middle-aged, genetically heterogeneous UM-HET3 mice.

The intervention group trained 5 days per week for 4 weeks at 65% of maximal work output, compared to a sedentary control group.

Beta diversity analysis of post-intervention fecal samples revealed a statistically significant separation (P = 0.01) in microbial community composition between the active and sedentary groups.

At the phylum level, exercise was associated with relative increases in Firmicutes and Verrucomicrobiota, and decreases in Bacteroidota and Desulfobacterota.

Although the exercised mice exhibited a higher median alpha diversity richness of 219.5, the difference compared to controls was not statistically significant.

The use of genetically heterogeneous UM-HET3 mice increases the translational relevance of the findings, suggesting that exercise-induced microbial shifts are robust against diverse genetic backgrounds.

Identifying specific taxonomic shifts, such as increased Verrucomicrobiota, helps pinpoint precise targets within the gut-muscle axis that may mediate physical resilience and metabolic health in aging organisms.

These findings clarify how non-pharmacological interventions like aerobic exercise help mitigate age-related physiological decline through systemic microbial modulation.

The pre-clinical findings strengthen the scientific case for developers of gut-microbiome therapeutics and metabolic health platforms targeting the aged population.

These results could drive interest in clinical trials investigating combined lifestyle and pharmacological approaches to healthy aging, particularly those designed to simulate or enhance the benefits of exercise on gastrointestinal and metabolic health.

Further studies evaluating whether the transfer of exercise-modified microbiota to sedentary, aged mice can replicate the physiological benefits of aerobic training.