The effect of overhead drilling position on shoulder moment and electromyography

Details

• Personal Author:
  Anton D ; Cook TM ; Fethke NB ; Hess, Jeffery E. ; Rosecrance J ; Shibley LD
• Description:
  The effect of overhead drilling tasks on electromyographic (EMG) activity and shoulder joint moment was examined in this study. Twenty subjects simulated an overhead drilling task using a close, middle and far reach position while standing on either a lower or a higher step of a stepladder. Root mean square amplitude (AMP) of EMG activity from the dominant side anterior deltoid, biceps brachii and triceps brachii muscles was used to determine muscular load. Digital video was used to determine shoulder joint moment using 2-dimensional static link segment modelling in the sagittal plane. The results demonstrated that, compared to the far reach position, using the close reach position significantly decreased anterior deltoid AMP and biceps brachii AMP and moment, but increased triceps brachii AMP. Compared to the lower step, using the higher step significantly decreased anterior deltoid AMP and triceps AMP and moment, while increasing biceps AMP in the close position. There was no significant change noted in EMG median frequency indicating that fatigue was minimized. Moment increased monotonically with AMP. The findings indicated that workers performing overhead tasks should work close to their body in order to minimize shoulder forces. The implications of this recommendation are discussed. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Construction Industry Construction Materials Fatigue Musculoskeletal Diseases Musculoskeletal System Occupational Health Safety
• Keywords:
  Arm Elevation Author Keywords: Adult Biomechanics Construction Construction-equipment Construction-industry Construction-materials Construction-workers Human Models Motion-studies Muscle-function Muscle-physiology Muscle-stress Muscle-tension Muscular-disorders Musculoskeletal-system Musculoskeletal-system-disorders Myoelectric Amplitude Myoelectric Power Spectrum Occupational Disorders Physical-stress Physiological-fatigue Physiological-measurements Shoulder Joint Simulation-methods Step-ladders Task-performance Working Posture

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• ISSN:
  0014-0139
• Document Type:
  Text
• Funding:
  Cooperative Agreement
• Genre:
  Journal Article
• Place as Subject:
  Iowa ; Maryland ; Oregon ; OSHA Region 10 ; OSHA Region 3 ; OSHA Region 5 ; OSHA Region 7 ; Wisconsin
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  489-501
• Volume:
  44
• Issue:
  5
• NIOSHTIC Number:
  nn:20040378
• Citation:
  Ergonomics 2001 Apr; 44(5):489-501
• Contact Point Address:
  Dan Anton, Biomechanics and Ergonomics Facility, 100 Oakdale Campus, 156D IREH, The University of Iowa, IA 52242, USA
• Email:
  dan-anton@uiowa.edu
• Federal Fiscal Year:
  2001
• NORA Priority Area:
  Disease and Injury: Musculoskeletal Disorders of the Upper Extremities ; Construction
• Performing Organization:
  The Center to Protect Workers' Rights
• Peer Reviewed:
  True
• Start Date:
  19990930
• Source Full Name:
  Ergonomics
• End Date:
  20050630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:718e43278c45a6cf099cfbacd195e688395107153f198e58157f9799e40a4bba204ea34573c494926d9052db30f8cba94a4a9b5e87bfbc4d5cd54577147adc34
• Download URL:
  https://stacks.cdc.gov/view/cdc/193281/cdc_193281_DS1.pdf
• File Type:
  [PDF - 264.58 KB ]