Research
Hormonal
Muscle fiber loss (hypoplasia) and motor unit denervation contribute significantly to age-related muscle atrophy, independent of simple fiber shrinking.
Maintaining muscle isn't just about eating protein; it's about keeping the nerve connections to your muscles intact. Regular resistance exercise is crucial to stimulate these nerves and prevent the actual loss of muscle fibers.
ModerateSupportsMEDIUM confidence
Loss of muscle fibres is associated with the age-related loss of motor units (MU)... The loss of a MU will leave a muscle fibre denervated and more susceptible to atrophy and eventually loss.
Why this rating
Evidence is mixed due to methodological differences in cadaveric vs biopsy studies.
Source
The age-related loss of skeletal muscle mass and function: Measurement and physiology of muscle fibre atrophy and muscle fibre loss in humans
Daniel J. Wilkinson et al. · Ageing Research Reviews · 2018
DOI 10.1016/j.arr.2018.07.005
narrative_reviewCited 825×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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