A New Simple Method for Kinematic Detection of Gait Events

摘要

The detection of gait events in locomotion, such as toe-off and heel-strike, provides a basic criterion for the division of a step cycle. This paper presents a new simple method for kinematic detection of gait events using kinematic data captured from only one marker attached to heel. We analyze the geometric distribution of the markers spatial positions over a small window of frames, and find there are new characteristics on the curve. These characteristics are used to detect the gait events for normal gaits. True errors (mean ± standard deviation) in the experiments on normal gaits are 8 ± 8 ms for heel-strike and 12 ± 20 ms for toe-off, where above 91% of subjects' heel strike events can be determined, with at most one frame (8.3 ms) error away from the ground reaction force (GRF) results.