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Diagnostic measures for sarcopenia and bone mineral density
A Y Bijlsma1, M C G Meskers, M Molendijk
1Department of Internal Medicine, Section of Gerontology and Geriatrics, VU University Medical Center, Postbus 7057, 1007, Amsterdam, The Netherlands.
Summary
Diagnostic measures for sarcopenia show varying associations with bone mineral density (BMD). Understanding these differences is crucial for accurate sarcopenia research and clinical outcomes.
Area of Science:
- Gerontology
- Musculoskeletal Health
- Bone Metabolism
Background:
- Sarcopenia diagnosis involves diverse measures of muscle mass, strength, and physical function.
- The relationship between these sarcopenia diagnostic measures and clinical outcomes like bone mineral density (BMD) requires clarification.
Purpose of the Study:
- To investigate the associations between various sarcopenia diagnostic measures and whole-body BMD.
- To identify how these associations differ across age and sex groups.
Main Methods:
- Utilized data from the MYOAGE European cross-sectional study (178 young, 274 old adults).
- Assessed body composition and BMD via dual-energy X-ray densitometry.
- Employed multiple sarcopenia diagnostic criteria including lean mass indices, muscle strength tests (knee extension torque, grip strength), and physical performance tests (walking speed, Timed Up and Go).
Main Results:
- Lean mass indices (lean mass percentage, appendicular lean mass/height squared) showed varied associations with BMD, with inverse relationships in older women that were mitigated by body mass adjustment.
- Muscle strength measures (knee extension torque, grip strength) were positively associated with BMD across most subgroups, except in older women.
- Physical performance tests (walking speed, Timed Up and Go) demonstrated no significant relationship with BMD.
Conclusions:
- The association between sarcopenia diagnostic measures and BMD, a key muscle-related outcome, is highly variable.
- These discrepancies highlight the importance of considering the specific measures used when diagnosing sarcopenia and interpreting research findings.
- Future sarcopenia research should carefully select and report diagnostic criteria to ensure comparability and accurate clinical interpretation.
