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. 2017 Nov 29;4(11):171673. doi: 10.1098/rsos.171673

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© 2017 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 4. — Group mean (standard deviation) anterior–posterior (AP), mediolateral (ML) and vertical (Vert) sacrum velocity variability for (a) systematic changes in walking speed and propulsive force targets extracted from slower speeds, and (b) walking at preferred speed with propulsive forces smaller or larger than preferred. Double asterisks represent significant (p < 0.05) main effects of speed or propulsive force. ‘a’ Significant (p < 0.05) pairwise difference at matched propulsive forces, ‘b’ significantly (p < 0.05) different from normal walking with biofeedback and ‘c’ significantly (p < 0.05) different from normal walking without biofeedback.