A New Method for Gravity Correction of Dynamometer Data and Determining Passive Elastic Moments at the Joint

Details

• Personal Author:
  Anderson DE ; Madigan ML ; Nussbaum MA ; Anderson DE ; Madigan ML ; Nussbaum MA
• Description:
  Moments measured by a dynamometer in biomechanics testing often include the gravitational moment and the passive elastic moment in addition to the moment caused by muscle contraction. Gravitational moments result from the weight of body segments and dynamometer attachment, whereas passive elastic moments are caused by the passive elastic deformation of tissues crossing the joint being assessed. Gravitational moments are a major potential source of error in dynamometer measurements and must be corrected for, a procedure often called gravity correction. While several approaches to gravity correction have been presented in the literature, they generally assume that the gravitational moment can be adequately modeled as a simple sine or cosine function. With this approach, a single passive data point may be used to specify the model, assuming that passive elastic moments are negligible at that point. A new method is presented here for the gravity correction of dynamometer data. Gravitational moment is represented using a generalized sinusoid, which is fit to passive data obtained over the entire joint range of motion. The model also explicitly accounts for the presence of passive elastic moments. The model was tested for cases of hip flexion-extension, knee flexion-extension, and ankle plantar flexion-dorsiflexion, and provided good fits in all cases. [Description provided by NIOSH]
• Subjects:
  Age Factors Biomechanical Phenomena Ergonomics Musculoskeletal System Occupational Health Safety Sex Characteristics
• Keywords:
  Age-factors Author Keywords: Isokinetic Dynamometer Biological-systems Biomechanical-modeling Biomechanics Gravitational Moment Gravity Correction Humans Joint Moment Mathematical-models Muscle-function Musculoskeletal-system Passive Elastic Moment Posture Sex-factors

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• ISSN:
  0021-9290
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article ; Journal Article
• Place as Subject:
  OSHA Region 3 ; Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH) ; National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health ; Workplace Safety & Health
• Location:
  North America ; North America
• Volume:
  46
• Issue:
  6
• NIOSHTIC Number:
  nn:20037028
• Citation:
  J Biomech 2010 Apr; 43(6):1220-1223
• Contact Point Address:
  Michael L. Madigan, Department of Engineering Science and Mechanics, Virginia Tech-Wake Forest School of Biomedical Engineering and Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 20461
• Email:
  mlm@vt.edu
• Federal Fiscal Year:
  2010
• Performing Organization:
  Virginia Polytechnic Institute and State University
• Peer Reviewed:
  True
• Start Date:
  20040801
• Source Full Name:
  Journal of Biomechanics
• End Date:
  20060731
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c60078f9b79a0b69633ba7d661632c58758abe194b2fce5f6a8a4f3d479216c96f1bf9e1dd1ffd6fa3828977067950640da17123172ea9e2602f987f154235ed
• Download URL:
  https://stacks.cdc.gov/view/cdc/188203/cdc_188203_DS1.pdf
• File Type:
  [PDF - 437.63 KB ]