Comparison of biomechanical and anatomical effects following eccentric and concentric exertions

Details

• Personal Author:
  Chourasia AO ; Howery RS ; Jung Y ; Radwin RG ; Sesto ME
• Description:
  Work place exertions may include muscle shortening (concentric) or muscle lengthening (eccentric) contractions. This study investigates the upper limb mechanical properties and magnetic resonance images (MRI) of the involved muscles following submaximal eccentric and concentric exertions. Twelve participants were randomly assigned to perform at 30 degrees per second eccentric or concentric forearm supination exertions at 50% isometric maximum voluntary contraction (MVC) for 30 minutes. Measurement of mechanical stiffness, isometric MVC, localized discomfort and MRI supinator: extensor signal intensity ratio was done before, immediately after, 1 hour after and 24 hours after the bout of exercise. A 53% average decrease in mechanical stiffness after 1 hour was observed for the eccentric group (p< 0.05) compared to a 1% average decrease for the concentric group (p> 0.05). Edema, indicative of swelling, was observed 24 hrs after exercise, with an average increase in the MRI supinator: extensor signal intensity ratio of 36% for the eccentric group and less than 10% for the concentric group (p<0.05). [Description provided by NIOSH]
• Subjects:
  Men Musculoskeletal Diseases Musculoskeletal System Occupational Health Safety Women
• Keywords:
  Diseases Etiology Hand-tools Humans Muscle-function Muscle-stress Muscles Musculoskeletal-system Musculoskeletal-system-disorders Physiological-function Physiology Posture Power-tools

  More +
• ISSN:
  1071-1813
• Publisher:
  Human Factors and Ergonomics Society
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Proceedings
• Place as Subject:
  Florida ; OSHA Region 4 ; OSHA Region 5 ; Wisconsin
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  49
• Issue:
  14
• NIOSHTIC Number:
  nn:20043838
• Citation:
  Proceedings of the Human Factors and Ergonomics Society 49th Annual Meeting, September 26-30, 2005, Orlando, Florida. Santa Monica, CA: Human Factors and Ergonomics Society, 2005 Sep; 49(14):1287-1291
• Federal Fiscal Year:
  2005
• Performing Organization:
  University of Wisconsin, Madison
• Peer Reviewed:
  True
• Start Date:
  20020930
• Source Full Name:
  Proceedings of the Human Factors and Ergonomics Society 49th Annual Meeting, September 26-30, 2005, Orlando, Florida
• End Date:
  20060929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:4a904a05f27d3ab94b40dda2c48d6ec12e20aa73bb3e8d1c79d2412834f6aadc8334d3c36a5e5561ace416acbf7f559e2497eca88a2e868d01b8c6303e26c0a7
• Download URL:
  https://stacks.cdc.gov/view/cdc/199718/cdc_199718_DS1.pdf
• File Type:
  [PDF - 180.35 KB ]