Details:

Alternative Title:
Ergonomics
Publisher's site:
http://dx.doi.org/10.1080/00140139.2014.966155
Personal Author:
Akkas, Oguz ; Azari, David P. ; Chen, Chia-Hsiung Eric ; Hu, Yu Hen ; Ulin, Sheryl S. ; ... More +
Akkas, Oguz ; Azari, David P. ; Chen, Chia-Hsiung Eric ; Hu, Yu Hen ; Ulin, Sheryl S. ; Armstrong, Thomas J. ; Rempel, David ; Radwin, Robert G. Less -
Description:
Objective

An equation was developed for estimating hand activity level (HAL) directly from tracked RMS hand speed (S) and duty cycle (D).

Background

Table lookup, equation, or marker-less video tracking can estimate HAL from motion/exertion frequency (F) and D. Since automatically estimating F is sometimes complex, HAL may be more readily assessed using S.

Methods

Hands from 33 videos originally used for the HAL rating were tracked to estimate S, scaled relative to hand breadth (HB), and single-frame analysis was used to measure D. Since HBs were unknown, a Monte Carlo method was employed for iteratively estimating the regression coefficients from US Army anthropometry survey data.

Results

The equation: =10[e−15.87+0.02D+2.25lnS1+e−15.87+0.02D+2.25lnS], R2 = 0.97, had a residual range ±0.5 HAL.

Conclusions

The S equation superiorly fit the Latko (1997) data and predicted independently observed HAL values (Harris, 2011) better (MSE=0.16) than the F equation (MSE=1.28).

Practitioner Summary

An equation was developed for estimating the HAL rating for the ACGIH Threshold Limit Value® based on hand RMS speed and duty cycle. Speed is more readily evaluated from videos using semi-automatic markerless tracking, than frequency. The speed equation predicted observed HAL values much better than the F equation.


Subjects:
[+]
Article Exposure Assessment Repetitive Motion Work Related Musculoskeletal Disorders
Source:
Ergonomics. 58(2):184-194.
Pubmed ID:
25343278
Pubmed Central ID:
PMC4664886
Document Type:
Journal Article
Funding:
R01 OH007914/OH/NIOSH CDC HHS/United States ; R01OH007914/OH/NIOSH CDC HHS/United States ; R21 EB014583/EB/NIBIB NIH HHS/United States ; R21 OH010221/OH/NIOSH CDC HHS/United States ; R21OH010221/OH/NIOSH CDC HHS/United States
R01 OH007914/OH/NIOSH CDC HHS/United States ; R01OH007914/OH/NIOSH CDC HHS/United States ; R21 EB014583/EB/NIBIB NIH HHS/United States ; R21 OH010221/OH/NIOSH CDC HHS/United States ; R21OH010221/OH/NIOSH CDC HHS/United States Less -
Collection(s):
CDC Public Access
Main Document Checksum:
[+]
urn:sha256:bf11bf35e723896ab6fb725c216b8b5b14269b8ca61f1556237b1361c7b03e9a
Download URL:
https://stacks.cdc.gov/view/cdc/36248/cdc_36248_DS1.pdf
File Type:

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