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Do Different Ascertainment Techniques Identify the Same Individuals as Sarcopenic in the Canadian Longitudinal Study
Alexandra J Mayhew1,2,3, Stuart M Phillips4, Nazmul Sohel1,2,3
1Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada.
Journal of the American Geriatrics Society
|September 16, 2020
Summary
Diagnosing sarcopenia is inconsistent across different methods, impacting clinical management. A unified definition is needed for accurate identification and effective treatment of sarcopenia.
Area of Science:
- Gerontology
- Geriatrics
- Muscle Physiology
Background:
- Sarcopenia is linked to adverse health outcomes, including disability and mortality.
- Clinical management of sarcopenia is challenging due to difficulties in accurate diagnosis.
- Expert groups recommend various methods for ascertaining sarcopenia status.
Purpose of the Study:
- To assess the agreement between different methods for diagnosing sarcopenia.
- To evaluate the consistency of various operationalizations of sarcopenia.
Main Methods:
- Cross-sectional analysis of baseline data from the Canadian Longitudinal Study on Aging (2011-2015).
- Inclusion of 10,820 community-dwelling participants aged 65-85.
- Sarcopenia operationalized using appendicular lean mass (ALM), grip strength, and gait speed, with various ALM adjustment techniques.
Main Results:
- Agreement (Cohen's κ) between different sarcopenia ascertainment methods was generally low (below .50).
- Agreement varied significantly based on ALM adjustment techniques, ranging from .04 to .76.
- The combination of variables and adjustment methods showed insufficient agreement.
Conclusions:
- Current methods for diagnosing sarcopenia lack sufficient agreement, hindering clinical utility.
- Inconsistent diagnostic approaches may lead to differing treatment strategies.
- A unified definition of sarcopenia is essential for improving clinical management and patient outcomes.
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