Wrist Strength Is Dependent on Simultaneous Power Grip Intensity

Details

• Personal Author:
  Armstrong TJ ; Ashton-Miller JA ; Chaffin, Don B. ; Seo NJ
• Description:
  The effect of grip activities on wrist flexion/extension strength was examined. Twelve healthy subjects performed maximum wrist flexion/extension exertions with one of five levels of simultaneous grip effort: minimum effort; preferred effort; 30%, 60% and 100% maximum voluntary contraction. As grip force increased from the minimum to the maximum effort, average wrist flexion strength increased 34% and average wrist extension strength decreased 10%. It appears that the finger flexor tendons on the volar aspect of the wrist act agonistically in wrist flexion and act antagonistically to wrist extension. When an object gripped by the hand is fragile or uncomfortable, the reduced finger flexor activity will limit wrist flexion strength. Gripping a slippery object that requires high grip effort will result in reduced wrist extension strength. Grip force should be controlled during measurement of wrist flexion or extension strength. When analysing a task that involves both grip and wrist exertions, use of grip/wrist strength values that were measured during grip exertions only, or wrist exertions only, may incorrectly estimate the true grip/wrist strength, as grip and wrist activities significantly interact with each other as demonstrated in this paper. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Ergonomics Musculoskeletal System Occupational Health Safety
• Keywords:
  Author Keywords: Wrist Flexion-extension Biomechanical Modeling Biomechanics Force Grip Force Hand Biomechanics Upper Extremities Wrist Biomechanics Wrist Moment
• ISSN:
  0014-0139
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Michigan ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  51
• Issue:
  10
• NIOSHTIC Number:
  nn:20057832
• Citation:
  Ergonomics 2008 Oct; 51(10):1594-1605
• Contact Point Address:
  Na Jin Seo, Department of Industrial and Operations Engineering, University of Michigan, 1205 Beal Ave, Ann Arbor, MI 48109, USA
• Email:
  najins@umich.edu
• Federal Fiscal Year:
  2009
• Performing Organization:
  University of Michigan, Ann Arbor
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Ergonomics
• End Date:
  20280630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:23006b1dd0724d345ba2e37277705cd99b00c44137c667a6e332b9382664191667b6ced2f29e150612b7cc580e853e4c09809d453fc842c6783f109b2d5307c7
• Download URL:
  https://stacks.cdc.gov/view/cdc/215048/cdc_215048_DS1.pdf
• File Type:
  [PDF - 883.90 KB ]