Dynapenia and aging: an update.
Level 5 - mechanism / opinion, no new human data
Narrative review and conceptual framework paper with no primary empirical data.
PubMed 21444359 · doi:10.1093/gerona/glr010
What was done
This is a narrative review updating biological and clinical evidence on dynapenia—the age-related loss of muscle strength and power, distinguished from the loss of muscle mass (sarcopenia). The authors synthesize translational literature and propose a working clinical decision algorithm to screen for dynapenia using age, risk factors, grip strength, and knee extension strength.
What was found
The abstract reports no primary experimental or observational data and gives no quantitative numbers. It outlines a conceptual screening framework to evaluate muscle weakness as an independent contributor to physical disability risk in older adults.
Why it matters
It reinforces the operational distinction between muscle mass loss and functional strength loss, offering a practical screening strategy to evaluate physical disability risk independently of sarcopenia.
Limits
The paper provides no primary human trial data, sample sizes, or statistical metrics. The proposed screening algorithm is explicitly identified as unvalidated and requiring further empirical development and evaluation.
Cited by
- supports During aging, the loss of muscle strength is greater than can be explained solely by the loss of muscle mass.