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A frequency-duty cycle equation for the ACGIH hand activity level.

Authors
Radwin-RG; Azari-DP; Lindstrom-MJ; Ulin-SS; Armstrong-TJ; Rempel-D
Source
Ergonomics 2015 Feb; 58(2):173-183
NIOSHTIC No.
20045283
Abstract
A new equation for predicting the hand activity level (HAL) used in the American Conference for Government Industrial Hygienists threshold limit value (TLV) was based on exertion frequency (F) and percentage duty cycle (D). The TLV includes a table for estimating HAL from F and D originating from data in Latko et al. (Latko WA, Armstrong TJ, Foulke JA, Herrin GD, Rabourn RA, Ulin SS, Development and evaluation of an observational method for assessing repetition in hand tasks. American Industrial Hygiene Association Journal, 58(4):278-285, 1997) and post hoc adjustments that include extrapolations outside of the data range. Multimedia video task analysis determined D for two additional jobs from Latko's study not in the original data-set, and a new nonlinear regression equation was developed to better fit the data and create a more accurate table. The equation, HAL = 6:56 lnD[F1:31/1+ 3:18 F1:31], generally matches the TLV HAL lookup table, and is a substantial improvement over the linear model, particularly for F>1.25 Hz and D > 60% jobs. The equation more closely fits the data and applies the TLV using a continuous function. Practitioner Summary: The original HAL lookup table is limited in resolution, omits values and extrapolates values outside of the range of data. A new equation and table were developed to address these issues.
Keywords
Hand-protection; Musculoskeletal-system; Musculoskeletal-system-disorders; Extremities; Force; Exposure-levels; Risk-factors; Repetitive-work; Physiological-effects; Physiology; Carpal-tunnel-syndrome; Exposure-assessment; Analytical-processes; Author Keywords: repetitive motion; work-related musculoskeletal disorders; exposure assessment
Contact
Robert G. Radwin, Department of Industrial and Systems Engineering, University of Wisconsin-Madison, 1550 Engineering Drive, Madison, 53706-1608
CODEN
ERGOAX
Publication Date
20150201
Document Type
Journal Article
Email Address
radwin@discovery.wisc.edu
Funding Type
Grant
Fiscal Year
2015
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R21-OH-010221; Grant-Number-R01-OH-007914; M102014
Issue of Publication
2
ISSN
0014-0139
Source Name
Ergonomics
State
WI; MI; CA
Performing Organization
University of Wisconsin-Madison
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