Starting somewhere around your thirties, muscle quietly begins to leave. Not all at once: a little every year, barely noticeable, until one day getting up from a low chair feels like a project. When that loss runs faster than normal ageing, it has a name: sarcopenia. Most people have never heard of it, which is strange, because sooner or later it will matter to most of them.
What Is Sarcopenia?
Sarcopenia is the progressive, age-related loss of skeletal muscle mass and strength. An estimated 10–20% of older adults have it, and the consequences reach well past simple weakness: disability, loss of independence, more falls and fractures, longer hospital stays, and in severe cases, higher mortality. Despite all of that, most people have never heard the word.
Why Haven't We Heard of It?
Partly because declining strength feels inevitable. It gets filed alongside grey hair and reading glasses: just what ageing does. But normal ageing and sarcopenia are not the same thing. The second is faster, steeper and treatable, and it has been sitting in plain sight, largely unmeasured and unnamed, in clinics everywhere.
Why It Happens
Sarcopenia has several overlapping causes. Age-related hormonal changes reduce anabolic signalling. The body's ability to convert dietary protein into muscle tissue declines. Chronic low-grade inflammation accelerates muscle breakdown. Disruptions in the communication between the nervous system and muscles reduce motor unit recruitment. Lifestyle and environmental factors compound the picture: physical inactivity, prolonged bed rest, poor nutrition, dental problems that limit food intake, even obesity. And the uncomfortable detail: even physically active people are not fully protected.
The Consequences
Losing muscle quietly breaks a lot of other things. Balance gets worse. Bones lose density, because muscle loading is one of the main signals that keeps bone strong. Everyday tasks get harder: stairs, carrying shopping, getting off the floor. Falls become more likely and more consequential. Recovery from illness or surgery takes longer. Independence narrows, and the costs, personal and systemic, climb.
Diagnosis
If you are 65 or older, your healthcare provider should be actively screening for sarcopenia. Assessment typically involves questionnaires examining grip strength, walking speed, and functional mobility, combined with non-invasive measures of muscle mass (DEXA or bioelectrical impedance). The aim is to identify sarcopenia before its consequences become severe, and to address underlying causes alongside the muscle loss itself.
Fighting Back: Exercise and Nutrition
The most effective treatment for sarcopenia is not a drug. It is exercise and nutrition, applied consistently. Together they can slow the decline, restore lost capacity and prevent further losses:
- Resistance training 2–3 times per week, targeting all major muscle groups with progressive load. Studies confirm that adults in their 70s and 80s gain meaningful muscle mass and strength with consistent resistance training within 8–12 weeks.
- Protein intake of 1.2–1.6g per kg of bodyweight per day, distributed across meals (not concentrated in one sitting). Adequate protein provides the raw material muscle needs to rebuild.
- Vitamin D sufficiency: deficiency is common in older adults and impairs muscle function independently of exercise and diet.
The Physiotherapy Role
A physiotherapist can assess your current strength baseline, identify movement limitations that make standard exercises impractical, and build a progressive programme that is safe, effective and designed around your life. Muscle keeps responding to training at any age. The trick is a programme dosed for the person in front of us, not for a twenty-five-year-old.
"Even in your eighties, muscle still responds to being trained. The door does not close; the programme just needs to be right."