Document Detail


In-shoe center of pressure: Indirect force plate vs. direct insole measurement.
MedLine Citation:
PMID:  22938890     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: In-shoe center of pressure (COP) measurement is essential in biomechanics. COP can be measured directly utilizing pressure-sensitive insoles, or calculated indirectly via force plate-generated data. While the latter does not require the use of additional measurement hardware (shoe insoles), its precision at calculating in-shoe COP has not been determined. Our purpose was to ascertain the precision of force plate in-shoe COP calculations and enhance their accuracy through a mathematical algorithm. METHODS: Twelve male students participated in the study. In-shoe COP was measured synchronously via the Pedar-X insole system and AMTI force plates, comparing the measurements of both systems. A mathematical algorithm was created to improve agreement between the systems and comparisons were recalculated. RESULTS: The two methods showed different measurements of in-shoe COP. The medio-lateral (ML) and anterior-posterior (AP) Pearson correlation coefficients between systems were 0.44±0.35 and 0.99±0.01, and the ML and AP RMS errors were 6.3±3.0mm and 43.0±12.5mm, respectively. Using a mathematical algorithm, the differences between the measurements of each system could be reduced significantly (all P<0.001). CONCLUSIONS: Without adjustment, force plates give an approximate location of the COP. Using an adjustment model greatly improves the accuracy of the COP trajectory during stance.
Authors:
Eytan M Debbi; Alon Wolf; Yulia Goryachev; Ziva Yizhar; Elhanan Luger; Ronen Debi; Amir Haim
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-28
Journal Detail:
Title:  Foot (Edinburgh, Scotland)     Volume:  -     ISSN:  1532-2963     ISO Abbreviation:  Foot (Edinb)     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-9-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9109564     Medline TA:  Foot (Edinb)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Affiliation:
Biorobotics and Biomechanics Lab, Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
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