Mixed
Phase angle (PhA) measured via bioelectrical impedance analysis (BIA) serves as a valid, non-invasive indicator of muscle quality and can accurately predict sarcopenia across different age and sex groups.
Use a bioelectrical impedance analysis (BIA) scale to track your Phase Angle (PhA). A higher PhA generally indicates better cellular health and muscle quality. If your PhA drops significantly below established cutoffs (e.g., <5.95° for young men, <5.04° for elderly men, <5.02° for young women, <4.20° for elderly women), it may signal sarcopenia risk, warranting a check on strength and muscle mass, even if your weight hasn't changed.
The PhA reflected muscle quality and exhibited good accuracy in detecting sarcopenia, suggesting its utility as an index for easily measuring muscle quality, which could improve the diagnosis of sarcopenia.
Why this rating
Large sample size (n=1419), multiple regression controls, and ROC analysis showing high predictive accuracy (AUC > 0.8).
Source
Phase angle from bioelectrical impedance analysis is a useful indicator of muscle quality
Yasunori Akamatsu et al. · Journal of Cachexia Sarcopenia and Muscle · 2021
DOI 10.1002/jcsm.12860
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