Developing a Method for the Design and Evaluation of Manual Lifting Tasks

# Developing a Method for the Design and Evaluation of Manual Lifting Tasks

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## Developing a Method for the Design and Evaluation of Manual Lifting Tasks

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1. National Institute for Occupational Safety and Health (NIOSH) • 1981 • committee met to recommend criteria for defining lifting capacity • evaluate lifting demands

2. NIOSH Lifting Equation Criteria: 1. Biomechanical - loading of the spine 2. Physiological - energy expenditure 3. Psychophysical - capacity to lift

3. NIOSH Lifting Equation Goal: • Identify ergonomic solutions for reducing physical stresses • 1991 revised version

4. Activity • Keeping in mind the goal (and criteria) of the NIOSH committee • Identify features/factors of a lifting task that contribute the most to the hazard of low back injuries

5. Revised NIOSH Lifting Equation (1991) • Lifting equation for calculating the Recommended Weight Limit (RWL) • represents a load nearly all healthy workers could perform (up to 8 hrs.) w/o  risk of developing lifting-related LBP

6. RWL RWL = LC x HM x VM x DM x AM x FM x CM • LC = 51 lbs. • HM = horizontal (initial horizontal position) • VM = vertical (initial vertical position) • DM = distance (total vertical distance moved) • AM = asymmetric • FM = frequency • CM = coupling

7. RWL RWL = LC x HM x VM x DM x AM x FM x CM • LC = 51 lbs. • HM = 10/H • VM = 1 - (.0075|V - 30|) • DM = 0.82 - (1.8/D) • AM = 1 - (.0032 * A) • FM = Table • CM = Table

8. Lifting Index (LI) • Ratio or comparison between actual weight lifted (L) and RWL • LI = Load Weight / RWL • Relative index of physical stress