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

Radwin, Robert G.; Azari, David P.; Lindstrom, Mary J.; Ulin, Sheryl S.; Armstrong, Thomas J.; Rempel, David

doi:10.1080/00140139.2014.966154

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

Oct 24 2014
By Radwin, Robert G. ; Azari, David P. ; Lindstrom, Mary J. ; ...
http://dx.doi.org/10.1080/00140139.2014.966154
Source: Ergonomics. 58(2):173-183.

[PDF-1.35 MB]

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Details:

Alternative Title:

Ergonomics
Personal Author:

Radwin, Robert G. ; Azari, David P. ; Lindstrom, Mary J. ; Ulin, Sheryl S. ; Armstrong, Thomas J. ; ... More +

Radwin, Robert G. ; Azari, David P. ; Lindstrom, Mary J. ; Ulin, Sheryl S. ; Armstrong, Thomas J. ; Rempel, David Less -
Description:

Objective

A new equation for predicting the hand activity level (HAL) used in the ACGIH threshold limit value® (TLV®), was based on exertion frequency (F) and percentage duty cycle (D).

Background

The TLV® includes a table for estimating HAL from F and D originating from data in Latko et al. (1997) and post-hoc adjustments that includes extrapolations outside of the data range.

Methods

Multimedia video task analysis determined D for two additional jobs from Latko’s study not in the original data set, and a new non-linear regression equation was developed to better fit the data and create a more accurate table.

Results

The equation, HAL=6.56lnD[F1.311+3.18F1.31], 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.

Conclusion

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 was developed to address these issues.
Subjects:

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Article Exposure Assessment Repetitive Motion Work Related Musculoskeletal Disorders
Source:

Ergonomics. 58(2):173-183.
Pubmed ID:

25343340
Pubmed Central ID:

PMC4302734
Document Type:

Journal Article
Funding:

R01OH007914/OH/NIOSH CDC HHS/United States ; R21OH010221/OH/NIOSH CDC HHS/United States ; UL1 TR000427/TR/NCATS NIH HHS/United States

R01OH007914/OH/NIOSH CDC HHS/United States ; R21OH010221/OH/NIOSH CDC HHS/United States ; UL1 TR000427/TR/NCATS NIH HHS/United States Less -
Volume:

58
Issue:

2
Collection(s):

CDC Public Access
Main Document Checksum:

[+]

urn:sha256:ded5cdfe08667b9e580eca5759a664724698c5e6adb5842e95c8be0dfdc69764
Download URL:

https://stacks.cdc.gov/view/cdc/30257/cdc_30257_DS1.pdf
File Type:

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