Muscular Response to Sudden Load. A Tool to Evaluate Fatigue and Rehabilitation

Details

• Personal Author:
  Aleksiev AR ; Goel VK ; Magnusson ML ; Pope MH ; Spratt KF ; Wilder DG
• Description:
  Subjects were exposed to fatiguing and restorative interventions to assess their response to sudden loads. To investigate the erector spinae and rectus abdominis response characteristics to "sudden load" and the effect of fatigue and rehabilitation. Unexpected loads which people often experience, can lead to high forces in the spine and may be a cause of low back injury. Muscle responses to sudden load were mediated by fatigue, walking, expectation, method of load application, exposure to vibration, and cognitive-behavioral rehabilitation in patients with chronic low back pain. A novel technique, perfected in this work, called wavelet analysis, was used to analyze these data. Reaction time was affected by fatigue and expectation. Vibration exposure significantly increased the muscle response time. Walking was able to ameliorate that effect. Back muscles responded differently, depending on whether loads were applied to the back through the hands or through the trunk. Electromyographic reaction time and magnitude decreased in patients after a 2-week rehabilitation program. Sudden loads can exacerbate fatigue effects. Walking after driving reduces the risk to the back caused by handling unpredictable loads. Vibration exposure guidelines should be more conservative. Patients have longer response times than healthy subjects, but patients can improve their response to sudden loads via rehabilitation. Patients exhibit a flexion-extension oscillation at 5 Hz in response to a sudden load, suggesting that the 5-Hz, seated, natural frequency observed during whole-body vibration may result from neurophysiologic control limits. Description provided by NIOSH
• Subjects:
  • Environmental Monitoring
  • Fatigue
  • Musculoskeletal Diseases
  • Musculoskeletal System
  • Occupational Health
  • Risk Assessment
  • Risk Factors
  • Safety
  • Vibration
• Keywords:
  • Fatigue
  • Fatigue-properties
  • Exposure-assessment
  • Back-injuries
  • Spinal-cord-disorders
  • Injuries
  • Vibration
  • Vibration-exposure
  • Muscles
  • Risk-factors
  More +
• ISSN:
  0362-2436
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Iowa ; OSHA Region 1 ; OSHA Region 7 ; Vermont
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  21
• Issue:
  22
• NIOSHTIC Number:
  nn:20031097
• Citation:
  Spine 1996 Nov; 21(22):2628-2639
• Federal Fiscal Year:
  1997
• Performing Organization:
  University of Vermont, Burlington, Vermont; Iowa Spine Research Center, Biomedical Engineering Depatment, University of Iowa, Iowa City, Iowa
• Peer Reviewed:
  False
• Start Date:
  19900701
• Source Full Name:
  Spine
• End Date:
  19940630
• Download URL:
  https://stacks.cdc.gov/view/cdc/191453/cdc_191453_DS1.pdf
• File Type:
  [PDF - 2.84 MB]
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:03caebfac1b98c63d14d66f31033e5a7cdb118e6f4d5523c53e558e024bc19b0c2391c773ed07b73956b4da14218006f3fbbdc516d7b6640f008fd9833a60f5c