Sarcopenia and Muscle Loss

Sarcopenia is the progressive loss of muscle mass, strength and physical performance with age. Some decline is expected. Weakness severe enough to make rising from a chair difficult, slow walking, and repeated falls are not, and they should be assessed rather than accepted as ageing.

The distinction matters because sarcopenia responds to treatment, and the longer it goes unaddressed the more of the loss becomes difficult to reverse.

Age itself shifts the balance between muscle building and breakdown. On top of that: inactivity, inadequate protein intake, chronic disease including diabetes, cardiac and neurological conditions, and — most sharply — prolonged hospital admission or bed rest, which produces rapid muscle loss over days.

Each of these is modifiable to some degree, which is why assessment looks at all of them rather than at muscle alone.

Grip strength, chair-rise time, gait speed and where available muscle mass. These are simple, repeatable measurements and they are the reason progress can be shown rather than claimed.

Gait speed in particular is a strong predictor of independence in older adults. It is measured at the start and repeated, so any change is visible.

Older adults gain strength in response to resistance training, and the response is substantial: in a Cochrane review of 121 trials, the effect on muscle strength was large, with better rising from a chair and a modest gain in walking speed 6. General advice to stay active does not achieve the same result — the load has to be progressive and the programme has to be supervised for both safety and adequate intensity.

Protein intake is addressed alongside it, because training without adequate protein produces less benefit. Balance work is included, since the practical purpose is preventing falls and preserving independence rather than muscle measurement for its own sake.

Resistance training produces most of the gain; in trials in healthy adults, adding protein supplements increased gains in strength and muscle mass modestly, and the extra benefit became smaller with age 3. Protein without training does little: in frail nursing-home residents, a nutritional supplement alone had no effect on strength or walking speed 4. Older adults also need more protein than younger adults to maintain muscle 5.

This is why dietetic assessment runs alongside the strength programme rather than being offered as an optional extra, and why the two are prescribed together.

Not on their own. International clinical practice guidelines strongly recommend resistance-based exercise as the treatment for sarcopenia and make only a conditional recommendation for protein supplements or a protein-rich diet 2. They make no recommendation for vitamin D supplements or anabolic hormones, and found too little robust evidence to judge other treatments 2.

In practice, supplements are used to correct a shortfall — protein intake below what an older adult needs, or a proven vitamin D deficiency — alongside training rather than instead of it. Training remains the part that changes strength and function.