Estimations of relative effort during sit-to-stand increase when accounting for variations in maximum voluntary torque with joint angle and angular velocity

Details

• Personal Author:
  Anderson DE ; Bieryla KA ; Madigan ML
• Description:
  The main purpose of this study was to compare three methods of determining relative effort during sit-to-stand (STS). Fourteen young (mean 19.6+/-SD 1.2 years old) and 17 older (61.7+/-5.5 years old) adults completed six STS trials at three speeds: slow, normal, and fast. Sagittal plane joint torques at the hip, knee, and ankle were calculated through inverse dynamics. Isometric and isokinetic maximum voluntary contractions (MVC) for the hip, knee, and ankle were collected and used for model parameters to predict the participant-specific maximum voluntary joint torque. Three different measures of relative effort were determined by normalizing STS joint torques to three different estimates of maximum voluntary torque. Relative effort at the hip, knee, and ankle were higher when accounting for variations in maximum voluntary torque with joint angle and angular velocity (hip=26.3+/-13.5%, knee=78.4+/-32.2%, ankle=27.9+/-14.1%) compared to methods which do not account for these variations (hip=23.5+/-11.7%, knee=51.7+/-15.0%, ankle=20.7+/-10.4%). At higher velocities, the difference in calculating relative effort with respect to isometric MVC or incorporating joint angle and angular velocity became more evident. Estimates of relative effort that account for the variations in maximum voluntary torque with joint angle and angular velocity may provide higher levels of accuracy compared to methods based on measurements of maximal isometric torques. [Description provided by NIOSH]
• Subjects:
  Age Factors Biomechanical Phenomena Musculoskeletal System Occupational Health Safety Sex Characteristics
• Keywords:
  Age-factors Author Keywords: Sit-to-stand Biomechanics Humans Joint Torque Mathematical-models Muscle-function Musculoskeletal-system Physiological-factors Physiological-function Physiological-response Physiology Relative Effort Sex-factors Strength

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• ISSN:
  1050-6411
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  139-144
• Volume:
  19
• Issue:
  1
• NIOSHTIC Number:
  nn:20039010
• Citation:
  J Electromyogr Kinesiol 2009 Feb; 19(1):139-144
• Contact Point Address:
  Michael L. Madigan, Department of Engineering Science and Mechanics (MC 0219), Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
• Email:
  mlm@vt.edu
• Federal Fiscal Year:
  2009
• Performing Organization:
  Virginia Polytechnic Institute and State University
• Peer Reviewed:
  True
• Start Date:
  20040801
• Source Full Name:
  Journal of Electromyography and Kinesiology
• End Date:
  20060731
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:0b8647874cb7e892ebf575e0d77f794aa9ccb6f89c648dfca4ac2e0b8bee27d778d4f69dc9c3a28834af2b8a80896c2faf266c0dd7d8acb6a561251e9fb7a9ca
• Download URL:
  https://stacks.cdc.gov/view/cdc/192509/cdc_192509_DS1.pdf
• File Type:
  [PDF - 248.34 KB ]