Table 2.

EMG onset data.

	Average EMG onset ± SD (s)			Average EMG onset ± SD (s)
	Int–Int	Pro–Int	P-value	Int–Pro	Pro–Pro	P-value
Biceps brachii	238.5 ± 75.8	207.5 ± 118.5	0.540	251.0 ± 106.7	265.8 ± 116.4	0.809
Triceps brachii	329.1 ± 106.4	281.3 ± 135.8	0.487	329.9 ± 132.1	275.4 ± 93.2	0.428
Ant. deltoid	205.6 ± 63.2	210.2 ± 64.4	0.901	198.3 ± 56.5	218.0 ± 86.1	0.644
Pos. deltoid	353.4 ± 123.3	215.6 ± 98.6	0.058	372.9 ± 170.1	326.8 ± 136.9	0.640

Average EMG onset times for intact subjects and prosthesis wearers imitating same tool type. Statistical t-tests were performed within muscle type to investigate if EMG onset was different between the two subject populations. Significance threshold was held at α = 0.001.