Abstract
Despite the abundant literature on obstacle crossing in humans, the question of how the central nervous system (CNS) controls postural stability during gait initiation (GI) with the goal to clear an obstacle remains unclear. GI, which corresponds to the transient period between quiet standing and swing-foot contact with the ground, is a functional task classically used for studying balance-control mechanisms during complex whole-body movement. GI stabilizing features include anticipatory postural adjustments (APAs) and lateral swing-foot placement. Previous study has shown that APA features associated with rapid leg flexion depend on the level of temporal pressure. This study tested the hypothesis that the GI stabilizing features (1) are scaled according to the changes in the swing-phase duration that is associated with obstacle height and/or distance, and (2) are modified by the temporal pressure.
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