Muscles and Aging: It's Not All Downhill! 

Saul Stephens
19.10.25 10:42 PM - Comment(s)


As we get older, it's no secret that our bodies change. One area that often gets a lot of attention (and concern!) is our muscles. But what actually happens to our muscles as we age, and what can we do about it?

The Not-So-Good News:

  • Muscle Loss (Sarcopenia): This is a big one. We start to lose lean muscle mass, and the muscle fibres themselves can shrink (atrophy). This decrease often begins after middle age.
  • Fiber Changes: Our bodies may reduce the number of type II (fast-twitch) fibres,
  • Strength and Power Decline: The loss of muscle mass and fibre changes leads to a decrease in both strength and power. This can affect our ability to do everyday things like climbing stairs or getting out of a chair.
  • Slower Reflexes: The nervous system's ability to quickly recruit those fast-twitch fibres declines with age, impacting our reflexes and ability to react to things like trips and stumbles.
  • Increased Stiffness: Connective tissue becomes less elastic with age.

The Good News (and What You Can Do About It!):

  •  While some age-related muscle changes are unavoidable, we can significantly impact the process through exercise.

 

  • WHO Recommendations - Key Points:
    • Regular physical activity is crucial! Any activity is better than none.
    • Aerobic Activity: Aim for at least 150-300 minutes of moderate-intensity or 75-150 minutes of vigorous-intensity aerobic activity per week. You can also combine moderate and vigorous activities.
    • Muscle Strengthening: Do muscle-strengthening activities involving all major muscle groups on at least 2 days a week.
    • Multicomponent Activity: Emphasize functional balance and strength training on 3 or more days a week to enhance functional capacity and prevent falls.

Important Considerations:

  • Start Slowly: If you're not currently active, start with small amounts of physical activity and gradually increase the frequency, intensity, and duration.
  • Listen to Your Body: Be as physically active as your functional ability allows and adjust your effort level to your fitness level.
  • Consult a Professional: If you're unsure where to start, consult with a healthcare professional or qualified trainer.

https://www.who.int/publications/i/item/9789240015128

Krishnathasan D, & Vandervoort AA. (2000). Eccentric strength training prescription for older adults. Topics in Geriatric Rehabilitation15(3), 29–40. https://doi-org.ezproxy.sit.ac.nz/10.1097/00013614-200003000-00006


Saul Stephens