Aging, Osteo-Sarcopenia, and Musculoskeletal Mechano-Transduction.
Jenna M Leser, Anicca Harriot, Heather V Buck and 2 others
PMID 36004321WHAT IT FOUND
Aging bone and muscle cells lose their ability to sense mechanical load, requiring heavier weights to trigger growth.
This review suggests that while resistance exercise is essential, it may not fully reverse this loss of sensitivity, pointing to cellular mechanisms as future therapeutic targets.
Key findings
01The ability of bone cells to respond to mechanical load is reduced in aging, meaning loads that stimulate bone formation in young individuals are insufficient for older adults.
02Aging-related cellular stress increases cytoskeletal stiffness, which disrupts the 'Goldilocks zone' required for normal mechano-transduction in both bone and muscle.
03Exercise helps clear senescent cells and reduce inflammation, but may not be sufficient to fully restore the mechano-transduction capabilities of aged bone and muscle cells.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
This is a narrative review, not a systematic review or meta-analysis, so it does not provide pooled effect sizes or a comprehensive search strategy. Many of the mechanisms described are based on rodent models or in vitro studies, which may not translate directly to human clinical outcomes. The review focuses on a specific pathway (microtubules) and may not capture the full complexity of aging-related tissue decline.
Declared interests
The authors JS and CW hold patents related to the work, including one for targeting microtubules to improve bone mass. The work was funded by the NIH.
The easy way to misread this
Do not interpret this review as evidence that exercise is ineffective for older adults. The authors state that resistance exercise is necessary to maintain or improve bone and muscle mass, even if it does not fully restore cellular sensitivity to load.