Back Muscle Flexion Relaxation Phenomenon Under Uneven Ground Conditions

Details

• Personal Author:
  Hu B ; Nimbarte A ; Ning X
• Description:
  In agriculture, construction and fishing industries workers often perform deep trunk bending task on uneven ground surfaces. Although the load sharing mechanism between lumbar active and passive tissues during trunk bending motion has been extensively investigated in flat, balanced ground conditions, the effect of uneven ground surface on this mechanism has not yet been explored. The objective of the current study was to investigate the effects of slanted ground surfaces on the back muscle flexion relaxation phenomenon (FRP) during trunk flexion-extension motion. Sixteen subjects performed fifteen trunk flexion-extension motions in three different slanted ground conditions (Oo, 15o and 30o ). Motion sensors were attached to the skin over C7, Tl2 and S l vertebras to collect trunk kinematics data. Muscular electromyography (EMG) data were collected from Multifidus and Longissimus muscles using EMG electrodes. Results of this study demonstrated significant differences in the onset location of FRP between contralateral and ipsilateral side of back muscles. Strong interaction effect was also observed between slanted ground angle and the location (i.e. contralateral vs. ipsilateral) of back muscles. Subjects' ground weight distribution on lower extremities and their knee flexion angles were identified as the main contributors to the changes. [Description provided by NIOSH]
• Subjects:
  Agriculture Construction Industry Hunting Musculoskeletal Diseases Musculoskeletal System Occupational Health Safety
• Keywords:
  Agricultural Industry Back Injuries Back Pain Construction Construction Industry Extremities Fishing Industry Ground Stability MSD Muscular Disorders Musculoskeletal Disorders Musculoskeletal System Musculoskeletal System Disorders Posture Surface Properties Workers

  More +
• ISBN:
  9781632663085
• Publisher:
  Institute of Industrial Engineers
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Abstract or Summary
• Place as Subject:
  OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  3
• NIOSHTIC Number:
  nn:20049680
• Citation:
  63rd Annual Conference and Expo of the Institute of Industrial Engineers 2013, May 18-22, 2013, San Juan, Puerto Rico. Krishnamurthy A, Chan WKV eds. Norcross, GA, Institute of Industrial Engineers, 2013 May; 3:2140
• Editor(s):
  Krishnamurthy A; Chan WKV
• Federal Fiscal Year:
  2013
• Performing Organization:
  West Virginia University
• Peer Reviewed:
  False
• Start Date:
  20050701
• Source Full Name:
  63rd Annual Conference and Expo of the Institute of Industrial Engineers 2013, May 18-22, 2013, San Juan, Puerto Rico
• End Date:
  20250630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:758ec986e6aba2baed540deb5c0e599256aa29b85e2d3a213b88c7ef1f804ba5e8e6f3cb30a5fa39d5673666dd6b4532cad4d69328eb810dca59f908a4168c66
• Download URL:
  https://stacks.cdc.gov/view/cdc/210351/cdc_210351_DS1.pdf
• File Type:
  [PDF - 92.33 KB ]