Table 2.

Group average (± SD) onset-to-peak times and RMS envelope peak amplitudes for the prime mover muscles of voluntary motor tasks from 5 non-injured and 11 SCI subjects taken from the initial recording, first recording in which activity was present, and the final follow-up recording.

Muscle	Onset to Peak Time						Amplitude
	Non-injured	SCI					Non-injured	SCI
		Initial Recording		First seen		Follow-up		Initial	First seen	Follow-up
	(Sec ± SD)	number of sides	(Sec ± SD)	number of sides	(Sec ± SD)	(Sec ± SD)	(μV ± SD)	(μV ± SD)	(μV ± SD)	(μV ± SD)
Biceps Brachi	0.28 ± 0.17	11	1.33 ± 0.70**	15	1.58 ± 0.80**	1.22 ± 0.73	91 ±47	285 ± 519	69 ± 34	91 ± 46
Wrist Extensors	0.53 ± 0.39	10	1.76 ± 1.37*	13	2.06 ± 1.04**	1.36 ± 0.52*	386 ± 162	304 ± 274	135 ± 151**	173 ± 74
Quadriceps	0.42 ± 0.21	6	2.32 ± 0.70**	12	1.51 ± 0.61**	1.02 ± 0.53*	51 ±15	44 ± 22	113 ± 81*	62 ± 30
Tibialis Anterior	0.59 ± 0.28	11	4.17 ± 1.34**	12	1.90 ± 1.31**	0.89 ± 0.39*	280 ± 20	214 ± 242	226 ± 236	267 ± 107

Note that times for SCI subjects in both initial and “first seen” columns were significantly longer than for controls and that times decreased significantly between “first seen” and final follow-up sessions in all but the biceps brachi muscle

^*p<0.05;

^**p< 0.01.