What this means
The authors suggest that age-related muscle loss involves nerves and brain signals, not just muscle. They argue this view could guide better testing and treatments, but this is a proposal, not a test result.
Plain-English summary written by an AI model from the abstract. The original is below.
- Who it was tested in
- People
- Kind of research
- A summary of earlier studies
The science
- Original title
- Reframing sarcopenia as a disease of the ageing motor system.
- Authors
- Orssatto LBR, Arnold WD, Ferrucci L et al.
- Journal
- The lancet. Healthy longevity
- Published
- Aug 28, 2026
- Study type
- Review · in humans
- PMID
- 42664982 ↗
Abstract
Sarcopenia is a major driver of disability, frailty, and loss of independence in ageing populations. Current consensus definitions have shifted from low muscle mass to low muscle strength and impaired physical performance as the defining clinical features. The underlying disease model, however, has remained predominantly muscle-centric, a framing that has generated important advances in muscle biology but has also guided decades of muscle-focused research in which drugs that increase muscle mass have produced inconsistent functional benefits. Muscle mass and intrinsic muscle quality account for an important but incomplete proportion of age-related declines in strength and mobility. Ageing disrupts the entire motor system, from supraspinal centres, spinal circuitry, and peripheral nerves to neuromuscular junctions and muscle, reducing neural drive, coordination, and force generation. We propose reframing sarcopenia as a disease of the ageing motor system. Although existing strength-based and performance-based criteria capture the clinical syndrome, there is scope for improvement. The disease model and diagnostic framework should evolve to reflect the distributed biology of sarcopenia, guiding integrated assessment, mechanistic stratification, and therapies that target both neural and muscular mechanisms. Without this shift, meaningful therapeutic progress will remain challenging.
Orssatto LBR, Arnold WD, Ferrucci L et al. Reframing sarcopenia as a disease of the ageing motor system. The lancet. Healthy longevity. 2026. doi:10.1016/j.lanhl.2026.100898. PMID: 42664982. https://pubmed.ncbi.nlm.nih.gov/42664982/
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