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Acceptable workloads for three common mining materials.

Authors
Gallagher-S; Hamrick-CA
Source
Ergonomics 1992 Sep; 35(9):1013-1031
NIOSHTIC No.
10011423
Abstract
A series of psychophysical lifting studies was conducted to establish maximum acceptable weights of lift (mawl) for three supply items commonly handled in underground coal mines (rock dust bags, ventilation stopping blocks, and crib blocks). Each study utilized 12 subjects, all of whom had considerable experience working in underground coal mines. Effects of lifting in four postures (standing, stooping under a 1.5-M ceiling, stooping under a 1.2-M ceiling, and kneeling) were investigated together with four lifting conditions (combinations of lifting symmetry and lifting height). The frequency of lifting was set at four per minute, and the task duration was 15 min. Posture significantly affected the mawl for the rock dust bag (standing mawl was 7 pct greater than restricted postures, and kneeling mawl was 6.4 pct less than stooped); however, posture interacted with lifting conditions for both of the other materials. Physiological costs were found to be significantly greater in the stooped postures compared with kneeling for all materials. Other contrasts (standing versus restricted postures, stooping under 1.5-M ceiling versus stooping under 1.2-M ceiling) did not exhibit significantly different levels of energy expenditure. Energy expenditure was significantly affected by vertical lifting height; however, the plane of lifting had little influence on metabolic cost. Recommended acceptable workloads for the three materials are 20.0 Kg for the rock dust bag, 16.5 Kg for the ventilation stopping block, and 14.7 Kg for the crib block. These results suggest that miners a
Keywords
Underground-miners; Underground-mining; Psychophysiological-testing; Posture; Manual-materials-handling
CODEN
ERGOAX
Publication Date
19920901
Document Type
OP; Journal Article
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
OP 170-92
Issue of Publication
9
ISSN
0014-0139
NIOSH Division
PRC
Source Name
Ergonomics
State
PA
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