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The effect of overhead drilling position on shoulder moment and electromyography.

Authors
Anton-D; Shibley-LD; Fethke-NB; Hess-J; Cook-TM; Rosecrance-J
Source
Ergonomics 2001 Apr; 44(5):489-501
NIOSHTIC No.
20040378
Abstract
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.
Keywords
Construction; Construction-equipment; Construction-industry; Construction-materials; Construction-workers; Muscle-function; Muscle-stress; Muscular-disorders; Musculoskeletal-system; Musculoskeletal-system-disorders; Muscle-physiology; Muscle-tension; Biomechanics; Physiological-measurements; Physical-stress; Step-ladders; Models; Simulation-methods; Motion-studies; Task-performance; Fatigue; Physiological-fatigue; Author Keywords: Adult; Human; Biomechanics; Working Posture; Arm Elevation; Occupational Disorders; Shoulder Joint; Myoelectric Amplitude; Myoelectric Power Spectrum
Contact
Dan Anton, Biomechanics and Ergonomics Facility, 100 Oakdale Campus, 156D IREH, The University of Iowa, IA 52242, USA
CODEN
ERGOAX
Publication Date
20010415
Document Type
Journal Article
Email Address
dan-anton@uiowa.edu
Funding Amount
6544463
Funding Type
Cooperative Agreement; Construction
Fiscal Year
2001
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U60-CCU-317202
Issue of Publication
5
ISSN
0014-0139
Priority Area
Musculoskeletal-system-disorders; Construction
Source Name
Ergonomics
State
MD; IA; WI; OR
Performing Organization
The Center to Protect Workers' Rights
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