Effect of speed on mediolateral dynamic stability during stepping in older adults.

These APA are manifested by a lateral shift of the centre of pressure (CoP) toward the swing foot, which acts to propel the centre of mass (CoM) toward the stance leg prior to swing foot, thereby attenuating the subsequent lateral CoM fall (Rogers et al. [4]). It has been reported that young individuals are able to finely tune the temporo-spatial features of APA and the mediolateral swing foot placement at heel-contact time so as to maintain mediolateral dynamic stability unchanged during gait initiation whatever the gait speed (Caderby et al. [1]). To quantify mediolateral dynamic stability, we calculated the margin of stability (MoS) at the time of heel-contact (Hof et al. [2]). [Extracted from the article]