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

Table 2

Estimates of lower leg and individual skeletal muscle hydration using bioelectrical impedance spectroscopy and magnetic resonance spectroscopy in healthy adults (𝑛=32).

Measure	Time 1; mean (SD)	Time 2; mean (SD)
BIS (Liters)
ECF	0.15 (0.02)	0.15 (0.02)
ICF	0.49 (0.15)	0.48 (0.15)
TW	0.64 (0.16)	0.62 (0.17)
ECF : ICF	0.31 (0.09)	0.31 (0.06)
𝑇2 (ms)
Tibialis anterior	36.37 (1.42)	36.25 (1.58)
Med gastrocnemius	38.73 (3.31)	38.79 (3.34)
Lat gastrocnemius	40.19 (3.2)	40.31 (2.96)
Soleus	39.68 (2.45)	39.81 (2.37)
ADC (mm/s^2)
Tibialis anterior	1.51 (0.11)	1.50 (0.08)
Med gastrocnemius	1.59 (0.09)	1.59 (0.06)
Lat gastrocnemius	1.64 (0.10)	1.63 (0.06)
Soleus	1.55 (0.1)	1.54 (0.1)

ADC: apparent diffusion coefficient; BIS: bioelectrical impedance spectroscopy; ECF: extracellular fluid; ICF: intracellular fluid; TW: total water; Med: medial; Lat: lateral.