Physiological models and guidelines for the design of high frequency shoulder lifting tasks.
Asfour-SS; Akcin-M; Tritar-M; Genaidy-AM
Proceedings of the Human Factors Society 35th Annual Meeting, September 2-6, 1991, San Francisco, California. Santa Monica, CA: Human Factors and Ergonomics Society, 1991 Sep; 35(11):814-817
An evaluation of continuous high frequency lifting tasks was conducted. Sixteen healthy male industrial workers participated in a study involving the lifting of a box with varying loads, at different frequency levels, from shoulder to reach height, for 8 hours, with 10 minutes of rest after each 50 minutes of work. Dependent variables were endurance time (ET), oxygen consumption (VO2), minute ventilation (VE) and heart rate (HR). Average physiological and subjective responses were determined. The effects of the independent variables of load and frequency were significant for ET, HR, VO2, and VE. ET and HR were significantly affected by the frequency of lifting, with a decrease in ET and increase in HR seen with increasing load or frequency of lifting. The ET was lower and the HR higher for shoulder to reach lifts than that seen for knuckle to shoulder lifts in a previous study. The authors conclude that ET decreases and physiological parameters increase with increases in load or frequency of lifts.
NIOSH-Grant; Musculoskeletal-system-disorders; Manual-lifting; Work-analysis; Task-performance; Statistical-analysis; Physiological-effects; Work-capacity; Humans
Industrial Engineering University of Miami P.o. Box 248294 Coral Gables, FL 33124
Proceedings of the Human Factors Society 35th Annual Meeting, September 2-6, 1991, San Francisco, California
University of Miami, Coral Gables, Florida