Fig. 4From: Walking with a powered ankle-foot orthosis: the effects of actuation timing and stiffness level on healthy usersRMS activity of the left SOL during stance in different walking conditions. Data are given for the last minute of walking and are normalized such that 1 corresponds to the maximum activation recorded during the MVIC exercises. Statistically significant difference in the muscle activity as compared to NW and ZT is reported with blue and orange asterisks, respectively. * indicates p ≤0.05, ** indicates p ≤0.01, and *** indicates p ≤0.001Back to article page