Characteristics of Reaction Force from the Floor in Stair Walking. Transient Characteristics in Stair Walking from or to Level Walking.

Abstract

We report the dynamic characteristics of the reaction force from the floor, its application point, and the velocity and the displacement of the center of gravity of human body in stair walking when transferring from or to level walking. The reaction force and its application point are obtained using two large force plates, on one of which a stair model with five stairs is fixed, and the velocity and the displacement of the C. G. of the body are calculated by integrating the force once or twice. Discussions of these dynamic characteristics and their transient properties are given. One of the remarkable transient characteristics in stair walking is observed in the sagittal components of three physical quantities: reaction force, the velocity of the C. G. of the body and its displacement.