Table 2.

Onsets and offsets of muscle bursts relative to left foot contact during intact and spinal locomotion expressed as a percentage of step cycle duration

		Cat 1		Cat 2		Cat 3
Muscle		ON	OFF	ON	OFF	ON	OFF
LSt	Intact	56 ± 3	74 ± 2	53 ± 3	77 ± 8	52 ± 3	73 ± 3
	Spinal	58 ± 2	68 ± 2*	54 ± 3	69 ± 3*	54 ± 9	87 ± 7*
LSrt	Intact	66 ± 2	93 ± 2	63 ± 4	94 ± 1	73 ± 2	92 ± 1
	Spinal	N/A	N/A	52 ± 6*	67 ± 3*	51 ± 9*	78 ± 7*
LVL	Intact	−10 ± 5	55 ± 3	−9 ± 4	52 ± 4	−7 ± 2	51 ± 3
	Spinal	−15 ± 3*	30 ± 4*	−9 ± 3	41 ± 4*	9 ± 5	49 ± 6
LLG	Intact	−12 ± 2	50 ± 3	−7 ± 1	54 ± 7	−10 ± 1	45 ± 3
	Spinal	−22 ± 7*	30 ± 7*	−9 ± 5	33 ± 5*	−12 ± 4	44 ± 5
LMG	Intact	−11 ± 1	52 ± 1	N/A	N/A	−11 ± 2	47 ± 4
	Spinal	−17 ± 4*	33 ± 5*	N/A	N/A	−12 ± 6	44 ± 6
LTA	Intact	N/A	N/A	67 ± 2	83 ± 3	54 ± 4	79 ± 3
	Spinal	N/A	N/A	60 ± 4*	71 ± 4*	N/D	N/D
RSt	Intact	95 ± 2	121 ± 3	108 ± 5	123 ± 6	N/A	N/A
	Spinal	96 ± 4	115 ± 4*	94 ± 7*	109 ± 8*	N/A	N/A
RSrt	Intact	114 ± 3	143 ± 6	115 ± 5	144 ± 6	124 ± 4	141 ± 4
	Spinal	N/D	N/D	101 ± 7*	115 ± 5*	107 ± 2*	125 ± 2*
RVL	Intact	35 ± 3	105 ± 2	34 ± 5	107 ± 4	46 ± 3	99 ± 2
	Spinal	33 ± 4	95 ± 3*	34 ± 3	100 ± 4*	44 ± 3	97 ± 4
RLG	Intact	38 ± 2	98 ± 2	40 ± 2	98 ± 6	42 ± 3	98 ± 4
	Spinal	22 ± 4*	76 ± 9*	28 ± 5*	82 ± 4*	41 ± 8	93 ± 5*
RMG	Intact	41 ± 3	93 ± 2	40 ± 3	94 ± 4	N/A	N/A
	Spinal	25 ± 4*	81 ± 8*	28 ± 6*	84 ± 8*	N/A	N/A
RTA	Intact	104 ± 2	131 ± 4	119 ± 3	141 ± 3	110 ± 3	135 ± 3
	Spinal	74 ± 6*	111 ± 5*	99 ± 6*	116 ± 5*	N/D	N/D

Each value is the average of 15–40 bursts.

^*P≤ 0.05.