This analysis measures bioimpedance parameters in active individuals, suggesting changes in hydration levels affect phase angle and characteristic frequency.
Background Bioelectrical impedance analysis (BIA) is commonly used to determine body composition, including estimates of total body water (TBW), intracellular water (ICW), and extracellular water (ECW). Evaluation of raw BIA data, i.e. resistance (R; as cellular hydration), reactance (Xc; as cellular integrity), and phase angle (PhA; as cellular health), has become more relevant when estimation equations may not be applicable, such as hypohydration in sport, occupational, or clinical settings. Bioimpedance values are typically determined at a generic characteristic frequency (Fc) of 50 kHz, which is intended to differentiate the ability of currents to penetrate cell membranes. Multi-frequency BIA allows for the estimation of Fc and its associated PhA at maximum reactance (PhA@Fc), which likely vary from assumed values on an individual basis or following certain physiological changes. Therefore, the purpose of this study was to examine these BIA parameters at rest and following passive dehydration.
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Fukuda et al. (2025) studied this question.
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