Table 2.

Mean (standard deviation) of rest motor threshold (in % of maximum stimulator output) and MEP sizes (peak-to-peak) at rest (baseline) and at onset of warning signal (WS) stimulus time in millivolt (mV) for younger and older adults in the left and right first dorsal interosseus (FDI) muscles

	Young		Old
	Left FDI	Right FDI	Left FDI	Right FDI
Rest motor threshold (%)	42.7 (3.0)***	39.6 (4.5)*,**	50.7 (4.9)	51.8 (4.8)
MEP size at rest (mV)	0.96 (0.49)	1.55 (0.83)**	1.08 (0.70)	1.04 (0.67)
MEP size at WS (mV)	1.45 (0.71)	2.24 (1.53)	1.69 (1.03)	2.20 (1.54)

^*p < 0.001 (significant difference between old and young for right FDI)

^**p < 0.05 (significant difference between left and right FDIs for young adults)

^***p < 0.001 (significant difference between old and young for left FDI)