The Influence of Deformation Height on Estimating the Center of Pressure During Level and Cross-Slope Walking on Sand

Details

• Personal Author:
  Bloswick D ; Greenland K ; Merryweather A ; Wang Y ; Xu H
• Description:
  Force plates are frequently used to collect the ground reaction forces (GRF) and center of pressure (COP) during gait. The calculated COP is affected by the material type and thickness covering the top surface. If the surface is deformable, these effects can be significant. The purpose of this study is to simulate and evaluate the effects of deformation height when calculating the COP in a deformable surface during gait. The GRF and COP data during normal gait were collected from 20 healthy adult males on sand in two conditions (level and cross-slope of 10 degrees). The COP differences in the anteroposterior (AP) and mediolateral (ML) directions were modeled for constant deformation heights (10-50 mm, 10 mm increments). The results showed the magnitude of COP changes in the AP and ML directions were different in both level and cross-slope conditions. A significantly larger COPML difference was shown for the cross-slope condition than level condition for the same deformation height. The COP was more sensitive to the deformation height for the downhill limb than uphill limb in the cross-slope condition. The results of this study suggest that the maximum allowable deformation height before a correction for surface deformation is needed is 20 mm for level condition and 10 mm for cross-slope condition, where 3 mm difference in COP is considered as the tolerance limit. Surface deformations beyond these thresholds may lead to an inaccurate interpretation and evaluation of joint kinetics during gait on deformable surfaces. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Occupational Health Safety
• Keywords:
  Author Keywords: Center Of Pressure Biomechanical Modeling Biomechanics Body Mechanics Deformable Surface Force Plate Gait Motion Studies Walking Surfaces
• ISSN:
  0966-6362
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 8 ; Utah
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  110-115
• Volume:
  42
• Issue:
  2
• NIOSHTIC Number:
  nn:20067366
• Citation:
  Gait Posture 2015 Jul; 42(2):110-115
• Contact Point Address:
  Hang Xu, School of Medical Imaging, Xuzhou Medical College, 209 Tongshan Road, Xuzhou 221004, PR China
• Email:
  h_xu@xzmc.edu.cn
• Federal Fiscal Year:
  2015
• Performing Organization:
  University of Utah
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Gait and Posture
• End Date:
  20280630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:d420b227fcbdd082fcac696130839309553ac946568067c62d98e06087254a8dc68acfe5f3fec312311caf0d5cc4fad1345118125fdec41386d993633dfd1712
• Download URL:
  https://stacks.cdc.gov/view/cdc/230873/cdc_230873_DS1.pdf
• File Type:
  [PDF - 1.29 MB ]