TABLE 2.

In vivo DTI results for four calf muscles.

	GM	GL	TA	SOL
λm	1.56 ± 0.05	1.61 ± 0.05	1.50 ± 0.05	1.50 ± 0.08
λ 1	1.95 ± 0.06	2.07 ± 0.07	1.86 ± 0.06	1.77 ± 0.08
λ 2	1.42 ± 0.06	1.47 ± 0.11	11.39 ± 0.08	1.44 ± 0.10
λ 3	1.31 ± 0.03	1.29 ± 0.04	1.26 ± 0.05	1.29 ± 0.05
FA	0.21 ± 0.01	0.25 ± 0.04	0.21 ± 0.02	0.16 ± 0.01
CP	0.04 ± 0.01	0.07 ± 0.03	0.06 ± 0.02	0.06 ± 0.02
θ 1	23 ± 1	16 ± 1	10 ± 2	33 ± 1
d m	70–110	60–110	80–110	90–110
α	0.6–0.9	0.6–0.8	0.6–0.8	0.4–0.7
τ in	0.8–2.6	0.8–2.6	0.8–2.6	0.8–2.6
D ex	1.62–2.34	1.62–2.34	1.62–2.34	1.62–2.34
Din	1.89–1.95	2.01–2.07	1.77–1.83	1.71–1.77
υ in	0.92–0.95	0.90–0.95	0.93–0.95	0.94–0.95

Notation: Gastrocnemius Medialis, GM; Gastrocnemius Lateralis, GL; Tibialis Anterior, TA; Soleus, SOL.

Mean values and standard deviations for the mean diffusion coefficient and the eigenvalues of the diffusion tensor (10⁻⁹ m²/s), the fractional anisotropy (FA), the planar index (CP) and the zenith angle of the primary eigenvector (°) and the model parameters range for the mean fiber diameter (μm), the geometric ratio of the elliptical fiber, the mean residence time in intracellular space (s), the extracellular and intracellular diffusion coefficients (10⁻⁹ m²/s), and the volume fraction of intracellular space.