How to assess functional status: a new muscle quality index.
Level 5 - mechanism / opinion, no new human data
Narrative review proposing a clinical concept and screening tool without empirical data.
PubMed 22238004 · doi:10.1007/s12603-012-0004-5
What was done
This narrative review synthesizes age-related changes in muscle mass, strength, and power to propose a clinical definition of muscle quality relative to functional status. The authors examine factors influencing strength-to-mass and power-to-mass ratios (including age, sex, hormones, obesity, activity, and fibrosis) and propose a bedside screening score combining handgrip dynamometry, bioelectrical impedance analysis for muscle mass, and a chair-stand test to estimate leg muscle power.
What was found
The abstract reports no empirical findings or numerical data. It presents a conceptual framework noting that muscle power declines faster than muscle strength, which in turn declines faster than muscle mass, and outlines a multi-component clinical tool aimed at identifying individuals at risk of functional incapacity.
Why it matters
It highlights muscle power and strength relative to mass as key functional indicators in sarcopenia and provides a simple clinical composite tool for screening functional risk in older adults.
Limits
As a conceptual review, the abstract provides no original clinical data, no validation metrics (such as sensitivity, specificity, or cut-offs), and no sample size. Clinical utility and predictive validity of the proposed score remain unverified within the text provided.
Cited by
- supports Muscle power starts declining earlier and declines more rapidly with age than muscle mass or muscle strength.