Maximum weights of asymmetrical loads acceptable to industrial workers for symmetrical manual lifting.
Am Ind Hyg Assoc J 1987 Jun; 48(6):539-544
Databases of the maximum acceptable weight of asymmetrical loads for male and female industrial workers were developed. Maximum acceptable weights of lift were determined psychophysiologically for 37 male and 37 female experienced industrial workers, and 37 male and 37 female students, by allowing each subject to adjust weight in a box to arrive at the maximum acceptable weight of lift. Maximum acceptable weight of lift data were then adjusted for the effect of work shift duration. On the average, the maximum acceptable weight of lift for male students was 89 percent of the maximum acceptable weight of lift for male industrial workers, while the maximum weight of lift acceptable for female students was 94 percent of that of acceptable for female industrial workers. Changes in maximum acceptable weight of lift were determined in response to changes in three different task variables: lifting heights, lifting frequency, and box size. The patterns of decline in maximum acceptable weight with lifting height and box size were similar between industrial workers and students of the same gender. However, the response to changes in lifting frequency was similar between male and female students, and between male and female industrial workers. In a separate study, the maximum acceptable weight of lift of asymmetrical loads was determined psychophysiologically for ten male college students. These data were adjusted to generate design databases of maximum acceptable weight of lift for asymmetrical loads for male and female industrial workers. The authors recommend that the databases developed be used in designing manual lifting jobs involving asymmetrical loads in order to reduce spinal stresses and the risk of overexertion injuries.
NIOSH-Publication; NIOSH-Grant; Physical-stress; Industrial-factory-workers; Ergonomics; Fatigue; Psychophysiology; Work-capacity; Back-injuries; Humans
Mechanical and Industrial Engr University of Cincinnati Dept of Mec & Indus Engrg Cincinnati, OH 45221
American Industrial Hygiene Association Journal
University of Cincinnati, Cincinnati, Ohio