Table 2.

Relationship between FA, MD, AD and RD and the battery of neurophysiological measures. Results from multiple linear regression analyses between the diffusion metrics across all ROIs and neurophysiological responses measured at the TA muscle. AD: mean diffusivity, CMCT: central motor conduction time, FA, fractional anisotropy, MD: mean diffusivity, MEP: motor evoked potential, PMCT: peripheral motor conduction time, RD: radial diffusivity, ROI: region of interest. N = 20. * = significant correlation following correction for multiple comparisons using false detection rate (FDR).

Diffusion metric ROI	MEP amplitude	MEP latency	F-wave latency	PMCT	CMCT
FA
Proximal	r = 0.15	r = −0.07	r = −0.36	r = −0.39	r = 0.37
	p = 0.65	p = 0.83	p = 0.16	p = 0.13	p = 0.23
Mid	r = 0.41	r = −0.14	r = −0.55	r = −0.54	r = 0.52
	p = 0.90	p = 0.96	p = 0.02*	p = 0.03*	p = 0.09
Distal	r = 0.21	r = −0.22	r = 0.67	r = −0.02	r = −0.52
	p = 0.51	p = 0.49	p = 0.79	p = 0.93	p = 0.08
MD
Proximal	r = −0.81	r = 0.10	r = 0.13	r = 0.15	r = −0.15
	p = 0.80	p = 0.76	p = 0.62	p = 0.56	p = 0.63
Mid	r = −0.10	r = −0.13	r = 0.47	r = 0.35	r = −0.46
	p = 0.075	p = 0.70	p = 0.06	p = 0.17	p = 0.13
Distal	r = −0.61	r = 0.21	r = −0.16	r = 0.08	r = 0.25
	p = 0.04	p = 0.52	p = 0.54	p = 0.75	p = 0.44
AD
Proximal	r = −0.13	r = 0.17	r = −0.01	r = 0.06	r = 0.01
	p = 0.68	p = 0.59	p = 0.99	p = 0.83	p = 0.99
Mid	r = −0.20	r = −0.03	r = 0.45	r = 0.35	r = −0.37
	p = 0.53	p = 0.92	p = 0.07	p = 0.17	p = 0.23
Distal	r = −0.56	r = 0.36	r = −0.07	r = 0.18	r = 0.14
	p = 0.06	p = 0.25	p = 0.80	p = 0.48	p = 0.67
RD
Proximal	r = −0.17	r = 0.13	r = 0.07	r = 0.11	r = −0.04
	p = 0.59	p = 0.68	p = 0.78	p = 0.67	p = 0.90
Mid	r = −0.33	r = −0.02	r = 0.28	r = 0.19	r = −0.01
	p = 0.30	p = 0.96	p = 0.28	p = 0.46	p = 0.97
Distal	r = 0.22	r = 0.55	r = −0.01	r = 0.14	r = 0.25
	p = 0.50	p = 0.06	p = 0.98	p = 0.59	p = 0.43