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Pressure thresholds and stiffness on the plantar surface of the human foot.

Authors
  • Weerasinghe, Thilina W1
  • Goonetilleke, Ravindra S1
  • Reischl, Uwe2
  • 1 a Human Performance Laboratory , Hong Kong University of Science and Technology , Clear Water Bay , Hong Kong. , (Hong Kong SAR China)
  • 2 b Department of Community and Environmental Health , Boise State University , Boise , ID , USA.
Type
Published Article
Journal
Ergonomics
Publication Date
Jul 01, 2017
Volume
60
Issue
7
Pages
985–996
Identifiers
DOI: 10.1080/00140139.2016.1229042
PMID: 27609429
Source
Medline
Keywords
License
Unknown

Abstract

A methodology to assess Pressure Discomfort Thresholds (PDT), Pressure Pain Thresholds (PPT) and tissue stiffness on the plantar surface of the foot was developed. Ten male and 10 female participants volunteered for the study. Foot landmarks were used to create a standardised grid-type template of 95 points. For each test point, PPT and PDT values were obtained, and stiffness was calculated for each of the 20 participants. Cluster analyses were performed to determine the regions of similarity for the three dependent variables, PPT, PDT and stiffness. Moran's-I-index was used to determine the spatial auto correlations. The use of k-means clustering showed five distinct clusters while the three dependent variables showed strong correlations to each other. Morisita's similarity index was used to check the similarity of the grid among all participants. Both male and female participants showed a Morisita's index greater than 0.7 confirming the reliability of the foot template. Practitioner Summary: Pressure Discomfort thresholds (PPT), Pressure pain thresholds (PPT) and tissue stiffness were evaluated at 95 points on the plantar surface of the foot. The PPT and related PDT map are useful to design the footbeds of shoes. Based on the data collected, five distinct clusters of locations were identified.

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