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Effect of step height on overhead drilling in construction.

Authors
Anton-D; Shibley-LD; Fethke-NB; Hess-J; Cook-T; Rosecrance-J
Source
Proceedings of the IEA 2000/HFES 2000 Congress, Vol. 5, San Diego, CA, July 30-August 4, 2000. Santa Monica, CA: Human Factors and Ergonomics Society, 2000 Jul; 5:663-666
NIOSHTIC No.
20026180
Abstract
The purpose of this study was to determine the effect of moving closer to the work while performing overhead drilling. This task was simulated by twenty subjects while standing on either a lower or a higher step of a stepladder. Shoulder load was estimated by root-mean-square amplitude of electromyographic (EMG) activity and cinematographic analysis to determine shoulder joint moment using static link segment modeling. The results indicated that moving closer to the work surface by moving up a step reduces shoulder joint moment and anterior deltoid EMG. However, biceps brachii EMG increased by moving up a step. There was no significant change noted in EMG median frequencies suggesting that fatigue was not a significant factor. We conclude that while moving up a step reduces the muscular load on some muscles and the shoulder joint, other muscles may work harder. There are also safety considerations regarding moving up a step and alternative methods to move closer to the work surface are suggested.
Keywords
Construction-industry; Construction-workers; Ergonomics; Musculoskeletal-system-disorders; Humans; Power-tools; Ladders; Muscles; Muscle-function; Musculoskeletal-system; Physical-stress
Publication Date
20000730
Document Type
Conference/Symposia Proceedings
Funding Amount
1910134
Funding Type
Cooperative Agreement; Construction
Fiscal Year
2000
NTIS Accession No.
NTIS Price
ISBN No.
0945289138
Identifying No.
Cooperative-Agreement-Number-U02-CCU-312014
Priority Area
Construction
Source Name
Proceedings of the IEA 2000/HFES 2000 Congress, Vol. 5, San Diego, CA, July 30-August 4, 2000
State
DC; CA; IA
Performing Organization
Center to Protect Workers' Rights
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