Regular Exercise May Keep Muscles Molecularly Younger, Study Finds

A Nature Aging study of 47 adults (younger vs. older, with older split into exercise levels) found those who exercised regularly had fewer age-related changes in muscle gene expression and less pronounced NAD+-related metabolite changes, implying muscles may stay molecularly younger with activity. The older exercisers also averaged about 14,000 steps per day versus 7,000 for normally active peers. While findings support the link between activity and preserved muscle biology, they’re correlational and not proof of reduced disability, falls, or longer life. Current guidance remains at least 150 minutes of moderate exercise per week plus strength training, with implications for targeting pathways to help those unable to be active.