A Novel Method for Identifying Weight Distribution Changes During Prolonged Standing

Details

• Personal Author:
  Chambers AJ ; Wiltman SA
• Description:
  A common measure in prolonged standing research includes weight distribution changes over time, measured in the form of weight shifts, fidgets, and transfers, as an attempt to contextualize how people facilitate joint load relief and increased blood flow. The simplest analysis methods compare center of pressure (COP) or percent bodyweight (%BW) to a defined threshold. Cham and Redfern (2001) defined weight shifts as a change of any duration in the lateral COP beyond 10% of the total COP range seen for the trial. A weight shift defined by Wiggermann and Keyserling (2011) required that the subject change the distribution of bodyweight between the following groups and sustain that change for greater than 7.5 seconds: (1) >80 %BW on the left leg, (2) >80 %BW on the right leg, or (3) >20 %BW on each leg simultaneously. Prado et al (2011) calculated a cumulative sum of positive and negative changes in vertical ground reaction forces between legs compared to a user defined bodyweight threshold. Inconsistency across methodologies yields varying results, which tell different stories about the same data. Methods in prior literature only count the number of instances that force and/or time pass a certain threshold. The proposed method uses articular cartilage viscoelastic material properties as an inspiration to differentiate fidgets and shifts using both time and %BW moving threshold components. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Education Ergonomics Law Enforcement Mining Occupational Health Safety Staff Development
• Keywords:
  Biomechanical Modeling Biomechanics Lower Extremities Motion Studies Muscle Function Muscle Physiology Physiological Testing
• Publisher:
  American Society of Biomechanics (ASB)
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Abstract or Summary
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-2
• NIOSHTIC Number:
  nn:20061446
• Citation:
  Proceedings of the American Society of Biomechanics (ASB) East Coast Meeting, April 20-21, 2018, Reading, Pennsylvania. Newark, DE: American Society of Biomechanics (ASB), 2018 Apr; :1-2
• Email:
  saw153@pitt.edu
• Federal Fiscal Year:
  2018
• Performing Organization:
  University of Pittsburgh at Pittsburgh
• Peer Reviewed:
  False
• Start Date:
  20150901
• Source Full Name:
  Proceedings of the American Society of Biomechanics (ASB) East Coast Meeting, April 12-13, 2019, Reading, Pennsylvania
• End Date:
  20180831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:72d43b486c1990a2da0846428fb89934401ca3c664cb95f084e6a921e9f6734665d038c9749f0c075b44de793a5c7b886054a6f6ea7cd7fdc65b8c8d2d6ebead
• Download URL:
  https://stacks.cdc.gov/view/cdc/224976/cdc_224976_DS1.pdf
• File Type:
  [PDF - 901.45 KB ]