“Scientists have uncovered a key reason why exercise is so effective at helping older muscles stay strong. A new study from Duke-NUS Medical School shows that physical activity can restore the natural repair systems that weaken with age, helping muscles recover and maintain function later in life.
The research team, working with collaborators from Singapore General Hospital and Cardiff University, found that exercise helps correct an important imbalance that develops inside aging muscle cells. The findings, published in the Proceedings of the National Academy of Sciences (PNAS), provide new insight into the biological mechanisms behind muscle aging and could eventually lead to new approaches for preventing age related muscle loss.”
Why Muscle Health Declines With Aging
“Healthy muscles do far more than support movement. They also play important roles in metabolism, blood sugar regulation, and overall health. Beginning in middle age, muscle strength and function gradually decline, increasing the risk of falls, fractures, and slower recovery after illness or injury.
The consequences extend beyond individual health. As populations age, muscle loss can increase demands on caregivers and healthcare systems. Preserving muscle function is therefore an important part of maintaining independence and quality of life.
One of the key regulators of muscle health is a growth pathway called mTORC1, which helps control protein production and muscle maintenance. In aging muscles, this pathway can become excessively active. When that happens, muscles focus more on building new proteins while becoming less efficient at removing damaged ones.
Over time, these damaged proteins accumulate inside muscle cells, placing them under stress and contributing to the gradual loss of strength associated with aging. Until now, scientists did not fully understand what causes this imbalance.