Relationship of Phase Angle with Sarcopenia Components and Comprehensive Geriatric Assessment in Physically Independent Older Adults

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Objective: This study aimed to investigate the relationship between phase angle (PhA), sarcopenia components, and comprehensive geriatric assessment in physically independent older adults. Materials and Methods:This cross-sectional study involved 135 physically independent older adults admitted to a geriatric outpatient clinic.All participants underwent bioelectrical impedance analyses and comprehensive geriatric assessments.The individuals were investigated in two groups regarding PhA: 1 st versus 2 nd and 3 rd terciles.The individuals in the first tercile were considered to have low PhA (for women <4.6° and men <5.4°).Results: The prevalence of individuals with low PhA was 22% (n=30).PhA was correlated with hand grip strength (HGS) and appendicular skeletal muscle mass (ASMM) overall (r=0.523;p<0.001, r=0.335; p<0.001, respectively).A moderately positive, moderately significant correlation was found between PhA and ASMM in males (r=0.618;p<0.001), with the highest significance of all.In univariate analysis, components of sarcopenia and comprehensive geriatric assessments were not associated with low PhA values overall and in the male group (p>0.05).Only ASMM was significantly associated with low PhA in the univariate and multivariate analyses in the female group (p=0.02 and p=0.03, respectively).Conclusion: Challenges such as the use of different formulas for calculating ASMM and various cutoff values for different ethnic groups can be barriers to ASMM assessment.PhA might be a simple predictor of ASMM in physically independent older women.