The Cumulative Lifting Index (CULI) for the Revised NIOSH Lifting Equation: Quantifying Risk for Workers With Job Rotation

Human Factors
Arun Garg, Jay M Kapellusch

Abstract

The objectives were to: (a) develop a continuous frequency multiplier (FM) for the Revised NIOSH Lifting Equation (RNLE) as a function of lifting frequency and duration of a lifting task, and (b) describe the Cumulative Lifting Index (CULI), a methodology for estimating physical exposure to workers with job rotation. The existing FM for the RNLE (FME) does not differentiate between task duration >2 hr and <8 hr, which makes quantifying physical exposure to workers with job rotation difficult and presents challenges to job designers. Using the existing FMs for 1, 2, and 8 hr of task durations, we developed a continuous FM (FMP) that extends to 12 hr per day. We simulated 157,500 jobs consisting of two tasks each and, using different combinations of Frequency Independent Lifting Index, lifting frequency and duration of lifting. Biomechanical stresses were estimated using the CULI, time-weighted average (TWA), and peak exposure. The median difference between FME and FMP was ±1% (range: 0%-15%). Compared to CULI, TWA underestimated risk of low-back pain (LBP) for 18% to 30% of jobs, and peak exposure for an assumed 8-hr work shift overestimated risk of LBP for 20% to 25% of jobs. Peak task exposure showed 90% agreement with CULI bu...Continue Reading

Citations

Jul 8, 2016·Human Factors·Kermit G Davis, Stephen D Hudock
Jun 23, 2020·Journal of Occupational and Environmental Medicine·Matthew S ThieseJay Kapellusch
Nov 22, 2017·Journal of Occupational and Environmental Hygiene·Jay M KapelluschArun Garg
Jan 18, 2022·International Journal of Occupational Safety and Ergonomics : JOSE·Junshi LiuYipeng Liu

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Software Mentioned

RNLE
CULI

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