Fig. 2From: Comprehensive validation of a wearable foot sensor system for estimating spatiotemporal gait parameters by simultaneous three-dimensional optical motion analysisTemporal events during the stance phase. Toe contact and heel off events are defined as when the pitch angular velocity of the foot segment reaches above − 2 rad/s and below − 1 rad/s during the stance, respectively, and are used to distinguish among loading, foot-flat, and pushing in the stance phaseBack to article page