The Psychophysical Approach in Manual Lifting---A Verification Study

Anil Mital

111 citations0/0 files storedHuman Factors The Journal of the Human Factors and Ergonomics Society

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Ergonomics and Musculoskeletal Disorders Occupational Health and Performance Occupational Health and Safety Management

Abstract

An experiment was conducted to verify the psychophysical methodology used for determining lifting capabilities of workers. After estimating during a 25-min period what they could lift for 8 h, males lifted for 8 h. The amount lifted was only 65% of the estimated value. Females, on the other hand, lifted 84% of the estimated weight. When the lifting duration increased from 8 h to 12 h, males lifted only 70% and females lifted 77% of the estimated weights. The metabolic energy expenditure rate of the subjects also decreased significantly with time as the loads were reduced. Heart rates remained relatively constant at about 100 beats/min, even though energy expenditure rates decreased over the 12-h period. This could indicate that the subjects were sensitive to their general state of physiological strain in such work and adjusted the loads and corresponding energy expenditure rates to maintain a relatively constant circulatory burden.

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1955Bulletin of the World Health Organization

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2000Workplace Risk Factors and Occupational Musculoskeletal Disorders, Part 1: A Review of Biomechanical and Psychophysical Research on Risk Factors Associated with Low-Back Pain 2016The Revised Strain Index: an improved upper extremity exposure assessment model 1984Maximum weights of lift acceptable to male and female industrial workers for extended work shifts 1984Comprehensive maximum acceptable weight of lift database for regular 8-hour work shifts 1986Reliability of the psychophysical approach to manual lifting of liquids by females 1985A comparison of dynamic- and static-strength models for prediction of lifting capacity 1988Maximum acceptable weights, heart rates and RPEs for one hour's repetitive asymmetric lifting 1999The psychophysical approach to manual materials handling task design

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