National Institute for Occupational Safety and Health (NIOSH)

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NIOSH Lifting Equation submitted by William A. Groves

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Presentation transcript:

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

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

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

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

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

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

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

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

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