Biomechanics and energetics of walking in powered ankle exoskeletons using myoelectric control versus mechanically intrinsic control

Table 3 Resulting gait kinematic variability of each walking bout

Walking condition	Step length	Step width	Step period	Double support period
	(Normalized)	(Normalized)	(ms)	(ms)
Unpowered	0.021 ± 0.002	0.018 ± 0.002	14.1 ± 1.2	7.5 ± 0.6
Timing-Based	0.023 ± 0.002	0.021 ± 0.002	17.6 ± 1.5	9.2 ± 0.7
Proportional Myoelectric	0.026 ± 0.004	0.021 ± 0.001	17.1 ± 2.2	11.2 ± 1.1
P-Value	0.231	0.970	0.615	0.210

Variability has been defined as the average standard deviation across subjects. All values are reported as mean ±s.e.m. across subjects. All distance measurements have been normalized by leg length. P <0.05 represents a statistically significant difference between the proportional myoelectric controller and the timing-based controller

ISSN: 1743-0003