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Inside your digestive system live trillions of microorganisms, forming the gut microbiome. They assist with food digestion, reinforce immune defenses, and help regulate energy metabolism throughout the body. Recent scientific findings indicate that these microbes could also help shape muscle strength. As we get older, muscle strength naturally declines. Exercise and proper nutrition are proven ways to slow this process, but scientists are increasingly pointing to the gut microbiome as another key factor.
Researchers identified a key microbe from the Roseburia genus that appears more frequently in people exhibiting stronger muscles. This microbe is already recognized for generating beneficial metabolites in the gut during digestion, and emerging data suggest it could additionally bolster muscle function and resilience.
To examine these associations, the study enrolled 90 healthy young volunteers (18–25 years) and 33 older volunteers (65+ years). Fitness evaluations included key strength measures and oxygen consumption, a standard indicator of aerobic capacity during maximal exertion.
By analyzing stool microbiomes from the volunteers, the scientists uncovered a clear connection with Roseburia inulinivorans. Notably, older adults with this species present had 29% higher handgrip strength compared to those without it. In the young group, elevated levels of this bacterium corresponded to both stronger grip and enhanced cardiorespiratory fitness.
Although the human observations revealed a link, the team needed proof of direct causation, thus turning to mouse models for controlled testing. The researchers supplemented antibiotic-treated mice with the live bacterium. Strikingly, grip strength in the forelimbs rose by about 30%. The muscles adapted too, with treated mice displaying larger fiber sizes and structural enhancements.
Highlighting an age gap, the data showed Roseburia inulinivorans occurring less often and in smaller amounts among older adults. Researchers suggest this microbial decline may help account for the common loss of muscle strength in later life.
Future research is needed to determine whether the gut bacteria directly strengthens muscles or if people with stronger muscles naturally have higher levels of this bacterium in their gut. Even so, the findings point to an intriguing connection between the gut and muscle health that scientists are only beginning to understand.
To view the original scientific study click below:
Roseburia inulinivorans increases muscle strength
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