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Analysis of applied forces and electromyography of back and shoulders muscles when performing a simulated hand scaling task.

Authors
Porter-W; Gallagher-S; Torma-Krajewski-J
Source
Appl Ergon 2010 May 41(3):411-416
NIOSHTIC No.
20035982
Abstract
Hand scaling is a physically demanding task responsible for numerous overexertion injuries in underground mining. Scaling requires the miner to use a long pry bar to remove loose rock, reducing the likelihood of rock fall injuries. The experiments described in this article simulated "rib" scaling (scaling a mine wall) from an elevated bucket to examine force generation and electromyographic responses using two types of scaling bars (steel and fiberglass-reinforced aluminum) at five target heights ranging from floor level to 176 cm. Ten male and six female subjects were tested in separate experiments. Peak and average force applied at the scaling bar tip and normalized electromyography (EMG) of the left and right pairs of the deltoid and erectores spinae muscles were obtained. Work height significantly affected peak prying force during scaling activities with highest force capacity at the lower levels. Bar type did not affect force generation. However, use of the lighter fiberglass bar required significantly more muscle activity to achieve the same force. Results of these studies suggest that miners scale points on the rock face that are below their knees, and reposition the bucket as often as necessary to do so.
Keywords
Mining-industry; Underground-mining; Musculoskeletal-system-disorders; Men; Women; Workers; Humans; Miners; Mine-workers; Ergonomics; Author Keywords: Scaling; Electromyography; Mining
Contact
William Porter, Pittsburgh Research Laboratory, National Institute for Occupational Safety and Health, 626 Cochrans Mill Road, P.O. Box 18070, Pittsburgh, PA 15236, USA
CODEN
AERGBW
Publication Date
20100501
Document Type
Journal Article
Email Address
wlporter@cdc.gov
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Issue of Publication
3
ISSN
0003-6870
NIOSH Division
OMSHR
Priority Area
Construction; Mining
Source Name
Applied Ergonomics
State
WV
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