Prediction of maximum acceptable weight of lift in the horizontal and vertical planes using simulated job dynamic strengths.
Mital-A; Karwowski-W; Mazouz-K; Orsarh-E
Am Ind Hyg Assoc J 1986 May; 47(5):288-292
A study was performed to develop predictors of maximum acceptable load for symmetric and asymmetric lifting tasks based on simulated job dynamic strength (SJDS), which was defined as the maximal isokinetic muscular exertion measured while the body assumes the same configuration as during the actual lifting. Six female and 19 male college students were volunteer subjects. SJDS from left to right and right to left did not differ significantly either at 881 centimeters (cm) height or at 152cm height. A correlation of 0.84 was found between left to right and right to left values for the 81cm height, with a value of 0.74 for the 152cm height. At both heights, maximum lifting capacity (MLC) was identical. The Statistical Analysis System software showed that the correlation between SJDS and MLC was substantially higher than correlations between MLC and various isometric strengths, as expected. The correlation between SJDS and isometric strengths ranged from 0.14 to individual were the most important predictors for MLC. The authors suggest that for dynamic activities, such as materials handling, it is proper to use screening procedures which account for dynamic characteristics of the job. Dynamic strength is also less expensive to test than static strength. SJDS was more suitable for use than isometric strengths. Grip strength, body weight and waist circumference of the individual are also important in predicting MLC. Grip strength accounts for static components.
NIOSH-Publication; NIOSH-Grant; Muscle-stress; Musculoskeletal-system; Materials-handling; Task-performance; Work-capacity; Anthropometry; Humans
American Industrial Hygiene Association Journal
Mechanical and Industrial Engr University of Cincinnati Mail Location #72 Cincinnati, Ohio 45221