Sarcopenia
Age-related loss of muscle strength and mass
What it is
Sarcopenia is the progressive loss of skeletal muscle strength and mass with age. It is now recognised as a disease in its own right, defined primarily by low muscle STRENGTH — grip strength, the ability to rise from a chair — confirmed by low muscle mass, with walking speed indicating severity. Strength, not size, is the defining feature.
Why it matters
Sarcopenia is the biological engine of frailty. It predicts falls, fractures, hospitalisation, loss of independence, and death — and it is one of the most modifiable conditions in ageing. It is also widely regarded as an inevitable consequence of getting older, which is not true, and that belief is expensive: people accept the loss instead of resisting it. There is no approved drug. The treatment is resistance training, and it works at every age.
What BioSignal knows about treating this
What works for Sarcopenia
BioSignal’s clinical summary, most important first.
- PROGRESSIVE RESISTANCE TRAINING — the only well-established treatment, and it works into the tenth decade
- Adequate protein (~1.2–1.6 g/kg/day, distributed across meals; older adults need MORE, not less)
- Creatine as an adjunct to training (one of the few supplements with genuine support here)
- Correcting vitamin D deficiency
- Treating underlying disease and avoiding prolonged bed rest
- NOT recommended: testosterone therapy for sarcopenia in men without hypogonadism
Signal Records relevant to this condition
Interventions and contributing factors — some of these records describe a cause rather than a cure. The rating shown is BioSignal’s confidence in that Signal Record, not a claim about how well it treats this condition. Open any of them for the full evidence.
- CreatineHigh confidence
The best-evidenced supplement in sports science for strength, power and lean mass — and one of the cheapest. The kidney fear is a misread lab value. The broader claims (cognition, disease) are a long way behind the performance evidence.
- Whey ProteinHigh confidence
Works — for muscle, strength and recovery — but almost entirely by helping you hit a total daily protein target you could also hit with food. The feared harms (kidney, liver, bone) are not supported in healthy people. It is a convenience, and a good one, not a special substance.
- Vitamin DHigh confidence
Effective for deficiency and for bone health in at-risk groups. For broad disease prevention in adults who are already replete, the largest trials are null — and confidence in that null is high. Routine testing of healthy adults is not supported.
- Testosterone TherapyModerate confidence
Effective for genuine hypogonadism; no established benefit at normal levels. Suppresses fertility. Ask why testosterone is low before treating the number.
- CollagenModerate confidence
Real but modest evidence for skin hydration and elasticity, heavily shadowed by industry funding. Not established for joints, bone, tendon, hair or nails. It is an incomplete protein and does not build muscle. For skin, a retinoid and sunscreen have far better evidence and cost far less.
New to this? Read these first
How this usually unfolds
- Recognize risk factors
- Get diagnosed
- Track key biomarkers
- Lifestyle first
- Evidence-based treatment
- Long-term monitoring
Who is at risk
- Ageing (muscle mass and, more importantly, strength decline from midlife)
- Physical inactivity and sedentary behaviour
- Inadequate protein intake
- Bed rest and hospitalisation (disuse atrophy is astonishingly rapid)
- Chronic disease and inflammation
- Low testosterone or other endocrine dysfunction
- Obesity combined with low muscle (sarcopenic obesity — frequently missed because weight looks normal)
How it's diagnosed
Diagnosis begins with low muscle STRENGTH — measured by grip strength or a timed chair-stand test — and is confirmed by low muscle mass or quality on DXA or bioimpedance. Slow gait speed indicates severe sarcopenia. This ordering matters: strength is a better predictor of outcomes than mass, which is why chasing muscle size alone misses the point.
Key biomarkers
Lifestyle
Explore this condition across BioSignal
Related Foundations
Related Signal Records
Frequently asked questions
Isn't losing muscle just part of getting old?
Some decline is age-related, but the scale of loss most people experience is not inevitable — it is largely disuse wearing the costume of ageing. Older adults respond to resistance training with genuine gains in strength and muscle, into their eighties and beyond. Accepting sarcopenia as inevitable is one of the most costly beliefs in healthy ageing, because it leads people to stop doing the one thing that reverses it.
Can I just eat more protein?
Protein is necessary and most older adults do not get enough — but it is not sufficient. Protein without a training stimulus does not build muscle; it mostly gets used for something else. The signal comes from loading the muscle. Resistance training plus adequate protein works; protein alone largely does not. If you only do one, do the training.
What's the single most useful thing I can do?
Lift something heavy, regularly, and progressively. Progressive resistance training is the only intervention with strong evidence for reversing sarcopenia, and it also improves bone density, insulin sensitivity, balance, and falls risk at the same time. There is no drug that does this, and no supplement that substitutes for it.
Would testosterone help me build muscle back?
Testosterone therapy does produce modest gains in muscle mass, but it is not recommended as a treatment for sarcopenia in men who are not genuinely hypogonadal. The gains are smaller than resistance training delivers, it carries real risks including fertility suppression, and it does not address the disuse that caused the problem. If your testosterone is genuinely low, that is a separate conversation.
Evidence summary
Progressive resistance training has strong randomised evidence for increasing muscle strength and mass in older adults, including in the very old and frail, and is the cornerstone of every guideline. Adequate protein intake (around 1.2–1.6 g/kg/day) supports but does not substitute for the training stimulus. Creatine has supportive evidence as an adjunct to resistance training in older adults. No pharmacological agent is approved for sarcopenia, and testosterone is not recommended for this indication in the absence of hypogonadism. Grip strength and chair-stand performance are well-validated predictors of adverse outcomes.
References & sources
- EWGSOP2 — European consensus on definition and diagnosis of sarcopenia
- Randomised trials of progressive resistance training in older and frail adults
- Protein intake and muscle protein synthesis in ageing (PROT-AGE recommendations)
Educational information — not medical advice
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