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

Details

• Alternative Title:
  Ergonomics
• Personal Author:
  Radwin, Robert G. ; Azari, David P. ; Lindstrom, Mary J. ; Ulin, Sheryl S. ; Armstrong, Thomas J. ; Rempel, David
• 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:
  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
• 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:
  [PDF - 1.35 MB ]