Using horizontal heel displacement to identify heel strike instants in normal gait

Abstract Heel strike instants are an important component of gait analyses, yet accurate detection can be difficult without a force plate. This paper presents two novel techniques for kinematic heel strike instant (kHSI) detection which examined maximal resultant horizontal heel displacement (HHD). E...

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Bibliographic Details
Published in:Gait & posture 2015-06, Vol.42 (1), p.101-103
Main Authors: Banks, Jacob J, Chang, Wen-Ruey, Xu, Xu, Chang, Chien-Chi
Format: Article
Language:English
Subjects:
Accelerometry - statistics & numerical data
Adult
Biomechanical Phenomena
Comparison
Female
Gait - physiology
Gait events
Heel - physiology
Humans
Male
Mathematical Computing
Middle Aged
Orthopedics
Overground
Postural Balance - physiology
Shoes
Stance
Walking - physiology
Walking speed
Weight-Bearing - physiology
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Summary:Abstract Heel strike instants are an important component of gait analyses, yet accurate detection can be difficult without a force plate. This paper presents two novel techniques for kinematic heel strike instant (kHSI) detection which examined maximal resultant horizontal heel displacement (HHD). Each of these HHD techniques calculates HHD from a selected reference location of either the stance ankle or stance heel to the swing heel. The proposed techniques, along with other previously established techniques, were validated against a 10 N force plate threshold. Fifty-four healthy adults walked overground at both normal and fast speeds while wearing athletic shoes. The reported true and absolute errors were as low as 3.2 (4.4) and 5.7 (3.4) ms, respectively, across 8678 kHSI when using the stance ankle as a reference, which significantly outperformed ( p < 0.0001) the established techniques. Gait speed was shown to have a significant effect ( p < 0.0001) on HHD-determined kHSI, as well as the three other techniques evaluated, highlighting the need for condition-specific identification of kHSI.
ISSN:0966-6362
1879-2219
DOI:10.1016/j.gaitpost.2015.03.015