Showing papers by "David Howard published in 2011"
TL;DR: Through the inclusion of measured AIPP in future in-vivo studies comparing different prostheses more generic information, as opposed to product specific claims, will become more widely available to inform future designs, prescription, and alignment procedures.
37 citations
TL;DR: The results demonstrated that there was no significant difference of performances of canceling E between the single and dual tasks by using any of the control signals (p > 0.99), and the SMG control provided more consistent performances under the singleand dual tasks compared with EMG control.
Abstract: We have previously used the real-time change of muscle thickness detected using ultrasound, namely sonomyography (SMG), for prosthesis motor control purposes. In the present study, we further compared subjects' performance using SMG and surface electromyography (EMG) in a series of discrete tracking tasks, both with and without a concurrent auditory attention task. Sixteen healthy subjects used different signals in a random order to control the cursor on a personal computer screen to cancel the letter "E" in a sequence of vertically arranged letters. Subjects' performance was evaluated under isometric contraction and wrist extension using the extensor carpi radiali muscle. The percentage of successfully cancelled Es using SMG decreased by 21 ± 16% and 17 ± 11% in isometric contraction and wrist extension tests, respectively, compared with the corresponding performances using force and angle signals. The corresponding reduction recorded by using EMG was 40 ± 29% and 41 ± 25%. In addition, there was a significant decrease by using EMG compared with that by SMG (p 0.99). Furthermore, the SMG control provided more consistent performances under the single and dual tasks compared with EMG control.
33 citations
TL;DR: Electrode arrays interfaced with a thin continuous hydrogel sheet which is high resistivity to reduce transverse currents between electrodes in the array showed significant decreases in stimulation efficiency and focality compared to highresistivity hydrogels.
21 citations
TL;DR: It is found that toe clearance was affected by ground inclination, paving type, and sole geometry regardless of the computational method used (with p-values<0.01) but the use of the foremost part of the sole for toe clearance calculation results is an overestimation of this value.
19 citations
TL;DR: Gait analysis of 32 healthy older adults showed that tactile paving increases the variability in timing of foot placement by 20%, thereby indicating a disturbance of the rhythmic gait pattern, and the ability to stop upon cue from the traffic light was compromised.
15 citations