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

Table 7

Results of agreement between cBIS and MRI-acquired measures.

	𝑅		𝑅^2		SEE		Constant (95% CI)		cBIS ECF : ICF (95% CI)
	𝑇2	ADC	𝑇2	ADC	𝑇2	ADC	𝑇2	ADC	𝑇2	ADC
cBIS ECF : ICF
TA	0.36*	0.12	0.13*	0.01	1.45	0.08	33.6* (31.2, 36.1)	1.5 (1.3, 1.6)	8.3* (0.4, 16.3)	0.1 (−0.3, 0.6)
LG	0.29	0.08	0.08	0.01	3.39	0.1	35.7 (29.9, 41.4)	1.6 (1.4, 1.7)	15.0 (−3.4, 33.5)	0.1 (−0.4, 0.7)
MG	0.28	0.15	0.08	0.02	3.8	0.07	33.9 (27.6, 40.4)	1.6 (1.4, 1.7)	17.2 (−19.1, 53.4)	0.16 (−0.2, 0.6)
Soleus	0.41*	0.22	0.17*	0.05	3.1	0.09	33.8 (28.8, 38.8)	1.66 (1.51, 1.82)	19.8* (3.6, 35.9)	−0.3 (−0.81,0.21)

^∗𝑃<0.05.
ADC: apparent diffusion coefficient; cBIS: calf bioelectrical impedance spectroscopy; CI: confidence interval; ECF: extracellular fluid; ICF: intracellular fluid; LG: lateral gastrocnemius; MG: medial gastrocnemius; 𝑅: correlation coefficient; 𝑅²: coefficient of determination; 𝑇₂: transverse relaxation time constants; SEE: standard error of estimate.