Reliability of Calf Bioelectrical Impedance Spectroscopy and Magnetic-Resonance-Imaging-Acquired Skeletal Muscle Hydration Measures in Healthy People

Table 3

Test-retest reliability of estimates of calf muscle hydration in healthy adults (𝑛=32) using bioelectrical impedance spectroscopy values.

Estimate of calf muscle hydration	ICC2,1 (95% CI)	MDC95 (Liters)	Bias (SD)	95% LOA
ECF	0.77 (0.58, 0.88)*	—	−0.004 (0.14)	−0.03, 0.02
ICF	0.90 (0.8, 0.95)*	0.19	0.02 (0.05)	−0.08, 0.12
TW	0.92 (0.84, 0.96)*	0.19	0.02 (0.06)	−0.09, 0.12
ECF : ICF	0.58 (0.29, 0.77)*	0.15	−0.01 (0.07)	−0.15, 0.12

^∗𝑃<0.001.
ECF: extracellular fluid; ICC: intraclass correlations; ICF: intracellular fluid; LOA: limits of agreement; MDC: minimal detectable change; SD: standard deviation; TW: total water.