Short Rest Periods After Static Lumbar Flexion Are a Risk Factor for Cumulative Low Back Disorder

Details

• Personal Author:
  Burger EL ; Courville A ; Lu Y ; Sbriccoli P ; Solomonow M ; Zhou BH
• Description:
  The objective of this work was to study the effect of rest periods of various durations applied between six 10-min sessions of static flexion on the development of cumulative low back disorder (CLBD). Three experimental groups of a feline model were used, and the rest duration between sequential static load periods was set to 5, 10, and 20 min, with a corresponding load-to-rest ratio of 2:1, 1:1 and 1:2, respectively. The reflex electromyographic (EMG) activity from the multifidus muscles and supraspinous ligament displacement (creep) were recorded during the flexion periods and over 7 h of rest following the load-rest cycles. It was found that a minor disorder developed in all the groups whereas a severe neuromuscular disorder including a delayed hyperexcitability was observed only in the group subjected to 5 min rest. The two-way ANOVA showed a significant effect of time post loading (p<0.001) and rest duration (p<0.001) on the Normalized Integrated EMG (NIEMG) recovery data; a significant effect of time post loading on the Displacement data (p<0.001) was observed as well. The post hoc Fisher test performed on the NIEMG data during the recovery phase showed a significant difference between the group subjected to 5 min rest and the other two groups (p<0.001). These results suggest that while a short rest period of 2:1 load-to-rest ratio leads to CLBD, longer rest at 1:1 and 1:2 load-to-rest ratio are more favorable for preventing or attenuating the development of CLBD. Short rest periods between sessions of static lumbar flexion, therefore, are a risk factor for the development of CLBD. [Description provided by NIOSH]
• Subjects:
  Cumulative Trauma Disorders Musculoskeletal Diseases Musculoskeletal System Occupational Health Risk Assessment Risk Factors Safety
• Keywords:
  Back-injuries Cumulative-trauma-disorders Injuries Muscles Muscular-disorders Musculoskeletal-system Musculoskeletal-system-disorders Rest-periods Risk-factors Tension
• ISSN:
  1050-6411
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Louisiana ; OSHA Region 6
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  37-52
• Volume:
  15
• Issue:
  1
• NIOSHTIC Number:
  nn:20028733
• Citation:
  J Electromyogr Kinesiol 2005 Feb; 15(1):37-52
• Email:
  msolom@lsuhsc.edu
• Federal Fiscal Year:
  2005
• NORA Priority Area:
  Disease and Injury: Low Back Disorders
• Performing Organization:
  Louisiana State University, Health Sciences Center, New Orleans, Louisiana
• Peer Reviewed:
  True
• Start Date:
  20000501
• Source Full Name:
  Journal of Electromyography and Kinesiology
• End Date:
  20031030
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ba91157baac9a9210f0662cd1a972018761b7b050d5db8b6c3b8b8105ef8b69dcec896c3481b2aa2af0acfdb357947a16b6480b642de9260602ac19d510d8f60
• Download URL:
  https://stacks.cdc.gov/view/cdc/189906/cdc_189906_DS1.pdf
• File Type:
  [PDF - 774.50 KB ]