The Activity of Individual Trunk Muscles During Heavy Physical Loading

Details

• Personal Author:
  Andersson GBJ ; Schultz AB ; Zetterberg C
• Description:
  The myoelectric activity of ten trunk muscles were recorded, using intramuscular electrodes, when ten subjects made maximal and 50% of maximal static exertions in standing postures. Exertions were made in flexion, extension, and left and right lateral bending. Three heavy-lifting tasks also were studied. A biomechanical model was used to predict the forces in the trunk muscles, and the predictions then were compared to the measurements. The abdominal muscles were all active in attempted flexion, while the erector spinae muscles were inactive. In attempted extension, the erectors were maximally active, but considerable activity was present in the abdominal muscles as well. The highest activity levels recorded in the oblique abdominal muscles were in lateral bending. There were high degrees of correlation between the measured muscle activities and predicted muscle tensions for the erector spinae and rectus abdominus muscles, while the correlation coefficients for the oblique abdominal muscles were lower (0.4-0.7). The study indicates that inclusion of antagonistic activity is an important consideration to improve model predictions. The oblique abdominal muscles appear to be more active, in general, than predicted. For the longitudinal trunk muscles, the predictions are excellent throughout. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Musculoskeletal System Occupational Health Safety
• Keywords:
  Biomechanical Modeling Biomechanics Lifting Motion Studies Muscle Contraction Muscle Function Posture
• ISSN:
  0362-2436
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Illinois ; Michigan ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  12
• Issue:
  10
• NIOSHTIC Number:
  nn:20060211
• Citation:
  Spine 1987 Dec; 12(10):1035-1040
• Contact Point Address:
  Gunnar B. J. Andersson, MD, Rush Presbyterian-St. Luke's Medical Center, 1753 West Congress Parkway, Chicago, IL 60612
• Federal Fiscal Year:
  1988
• Performing Organization:
  University of Michigan at Ann Arbor, Ann Arbor, Michigan
• Peer Reviewed:
  False
• Start Date:
  19830901
• Source Full Name:
  Spine
• End Date:
  19860831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:406f7219862688e29a598487725f29cb1a43b3206f812aeb6d02322d86765c93173381a525233780aa901e14889d7f2e857bbd8ac2f5cf60eac1dedc05ba1bcc
• Download URL:
  https://stacks.cdc.gov/view/cdc/224184/cdc_224184_DS1.pdf
• File Type:
  [PDF - 581.41 KB ]