The Effect of Task Rotation on Activation and Fatigue Response of Rotator Cuff Muscles During Overhead Work

Details

• Personal Author:
  Motabar H ; Nimbarte AD
• Description:
  Overhead work is known as one of the ergonomic risk factors that can lead to shoulder overload and injury. Anatomical alignment of rotator cuff muscles makes them the most vulnerable to injuries during overhead work. In this study, the effect of task rotation, as one of the administrative controls to reduce the risk of injury during overhead work, on the fatigue response of rotator cuff muscles was investigated. Twelve participants performed three submaximal exertions (5, 20, and 35% of maximum voluntary contraction (MVC)) using four task rotation sequences (increasing, decreasing, upward parabolic, and downward parabolic). Median frequency of surface electromyography (EMG), shoulder strength, and ratings of perceived exertion (RPE) were used to study the fatigue response of rotator cuff muscles. Although the average normalized muscle activity was similar in all sequences, the task rotation sequence had a significant effect on the median frequency. The effect of task rotation sequence on the strength and RPE was similar to that of the median frequency but was statistically not significant. The upward parabolic task rotation sequence resulted in the lowest fatigue among all the task sequences. Performing intense exertions apart from each other, warm-up exertions, and the presence of active recovery after the intense exertions could be the factors that produced the lowest fatigue during this sequence. [Description provided by NIOSH]
• Subjects:
  Ergonomics Fatigue Musculoskeletal Diseases Musculoskeletal System Occupational Health Safety
• Keywords:
  Author Keywords: Rotator Cuff Muscles Electromyography MSD Muscle Fatigue Muscle Function Musculoskeletal Disorders Overhead Work Task Performance Task Rotation Upper Extremities Work Intervals

  More +
• ISSN:
  0003-6870
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• 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:
  97
• NIOSHTIC Number:
  nn:20063436
• Citation:
  Appl Ergon 2021 Nov; 97:103461
• Contact Point Address:
  Ashish D. Nimbarte, Industrial and Management Systems Engineering, West Virginia University, PO Box 6070, Morgantown, WV, 26506-6107, USA
• Email:
  Ashish.Nimbarte@mail.wvu.edu
• Federal Fiscal Year:
  2022
• Performing Organization:
  West Virginia University
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Applied Ergonomics
• End Date:
  20250630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:458819f0636e8c155c2dca4a9aa6bb106495340afba025e6e8613a33e7779da4367d611f83e610b648f6dcf756da047d604337fdc2bb5e4017ee1fe38a8f6d75
• Download URL:
  https://stacks.cdc.gov/view/cdc/226501/cdc_226501_DS1.pdf
• File Type:
  [PDF - 2.65 MB ]