Exercise Training Erases 50% of Age-Linked Muscle Changes, Boosting Older Adults' Response
Updated
Updated · Nature.com · Jul 3
Exercise Training Erases 50% of Age-Linked Muscle Changes, Boosting Older Adults' Response
3 articles · Updated · Nature.com · Jul 3
Summary
A multi-omics study found trained older adults lacked about 50% of the molecular muscle differences seen between untrained older and young adults, giving them profiles closer to younger people.
Baseline analyses showed aging muscle had lower expression of genes tied to cellular respiration and energy metabolism, while sustained training preserved many of those pathways.
After a submaximal exercise bout, all groups mounted immune and stress-related transcriptional responses, but older adults with higher fitness showed stronger responses.
Integrated transcriptomic, lipidomic and metabolomic data linked mitochondrial respiration, lipid metabolism, stress signaling and NAD+ biology, offering a molecular map of how fitness may slow muscle aging.
Since NAD+ supplements show mixed results, is exercise the only proven way to rejuvenate aging muscle?
Does making muscles molecularly 'younger' translate to a longer overall lifespan or just better healthspan?
The Science of Muscle Aging: DEAF1, Exercise, and New Frontiers in Lifelong Strength
Overview
In 2025, researchers at Duke-NUS Medical School identified the DEAF1 gene as a crucial molecular switch that helps control muscle health and repair. As people age, their muscles lose strength and the ability to repair themselves, but exercise can counteract this decline. The discovery of the FOXO-DEAF1-mTORC1 axis revealed how DEAF1 regulates key cellular processes like protein balance and recycling damaged components. Understanding this pathway explains why exercise is so effective against muscle aging and opens the door to new therapies that could mimic the benefits of exercise, helping older adults maintain muscle strength and vitality.