Muscle shape patterns differ in young and older adults
Computer models matched muscle shapes less closely in adults with sarcopenia, a muscle-wasting condition, scoring 0.93 versus 0.95 in healthy older adults.
Limit: Shape measurements do not quantify how accurately models classify individuals into groups
Edited by Boris Djordjevic · AgingResearch.News
An observational study of 74 young and older adults used three-dimensional ultrasound to examine three lower-limb muscles. Researchers compared simple measurements of muscle shape with advanced computer models. Some older participants had sarcopenia, a condition involving loss of muscle mass and strength.
A simple shape measure differed between young and older adults across all three muscles, but not between healthy older adults and those with sarcopenia. Average shapes in participants with sarcopenia showed less volume near the ends closer to the trunk than in healthy older adults, particularly in two muscles. Advanced models captured additional differences between the older groups, with reconstructed shapes matching the scans less closely in participants with sarcopenia. The authors identified the rectus femoris, a thigh muscle, as a promising candidate for a shape-based marker.
Why it matters
Preserving muscle quality is important for healthy longevity. The authors’ reproducible, open-source framework offers a way to study structural changes associated with aging and sarcopenia.
Caveats
This observational comparison cannot establish cause and effect. The authors cautioned that the measurements should not be interpreted as showing how accurately the models could classify people into groups.
The paper
Centre Hospitalier Universitaire de Nantes
Experimental Gerontology, Jul 30, 2026, Open access
