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

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

Ergonomics

a Department of Industrial and Systems Engineering , University of Wisconsin-Madison, 1550 Engineering Drive, Madison , 53706-1608 WI , USA.

Published: November 2016

AI Article Synopsis

  • A new equation for predicting hand activity level (HAL) was developed, focusing on exertion frequency (F) and percentage duty cycle (D), to improve the American Conference for Government Industrial Hygienists’ threshold limit value (TLV) table.
  • This new equation, derived from extensive analysis and data adjustment, aims to enhance accuracy when evaluating hand-related tasks by better fitting the observed data rather than relying solely on linear models.
  • It showed significant improvements, especially for situations with high frequency (F>1.25 Hz) and duty cycle (D>60%), offering a continuous function to assess HAL more effectively.

Article 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 ln D[F(1:31) /1+3:18 F(1:31), 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.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4302734PMC
http://dx.doi.org/10.1080/00140139.2014.966154DOI Listing

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