Large Propulsion Demands Increase Locomotor Adaptation at the Expense of Step Length Symmetry

Frontiers in Physiology
Carly J SombricGelsy Torres-Oviedo

Abstract

There is an interest to identify factors facilitating locomotor adaptation induced by split-belt walking (i.e., legs moving at different speeds) because of its clinical potential. We hypothesized that augmenting braking forces, rather than propulsion forces, experienced at the feet would increase locomotor adaptation during and after split-belt walking. To test this, forces were modulated during split-belt walking with distinct slopes: incline (larger propulsion than braking), decline (larger braking than propulsion), and flat (similar propulsion and braking). Step length asymmetry was compared between groups because it is a clinically relevant measure robustly adapted on split-belt treadmills. Unexpectedly, the group with larger propulsion demands (i.e., the incline group) changed their gait the most during adaptation, reached their final adapted state more quickly, and had larger after-effects when the split-belt perturbation was removed. We also found that subjects who experienced larger disruptions of propulsion forces in early adaptation exhibited greater after-effects, which further highlights the catalytic role of propulsion forces on locomotor adaptation. The relevance of mechanical demands on shaping our movements was ...Continue Reading

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Citations

Apr 3, 2020·Journal of Neurophysiology·Dulce M MariscalGelsy Torres-Oviedo
Mar 27, 2020·Frontiers in Neuroscience·Yashar AucieGelsy Torres-Oviedo
Jun 5, 2020·Journal of Neuroengineering and Rehabilitation·Carly J Sombric, Gelsy Torres-Oviedo
Oct 18, 2020·Brain Sciences·Usman RashidAlain C Vandal

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