Effects of box weight, vertical location and symmetry on lifting capacities and ratings on category scale in Japanese female workers
The aim was to clarify the effects of box weight, vertical location and symmetry on the lifting capacities and subjective burden in Japanese female workers with manual material handling tasks. Sixteen healthy females were tested. They performed 12 different lifting tasks (three heights * two weights * two symmetries). It is difficult for Japanese women to exert dynamic force in lifting a 15-kg weight from the elbow to the shoulder level. A remarkable increase was observed in heart rate and category scale with ratio properties (CR-10) on large muscle group in lifting a 15-kg weight as compared with lifting a 10-kg one. Judging from calculation of the Recommended Weight Limit using the application manual by the National Institute for Occupational Safe and Health, it was also suggested that lifting the 15-kg weight from the elbow to the shoulder level was difficult for female workers. Not only peak force, but also the average upward acceleration and peak velocity were lower in asymmetric liftings than those in symmetric liftings. CR-10 for the left back and right thigh were also higher in 90° right lateral plane lifting than in the mid-sagittal plane. Thus, asymmetric lifting was supposed to impose higher stress on the back contralaterally and thigh ipsilaterally to the location of the weight.
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Document Type: Regular Paper
Department of Physical Education, Daido Institute of Technology, 10-3 Takiharucho, Minami-ku, Nagoya 457-8530, Japan
Department of Public Health, Fujita Health University School of Medicine, 1-98 Dengakugakubo, Kutsukakecho, Toyoake, Aichi-ken 470-1192, Japan
Research Centre of Health, Physical Fitness and Sports, Nagoya University, Furocho, Chikusa-ku, Nagoya 464-8601, Japan
Department of Nursing, Nagoya University School of Health Sciences, 1-1-20 Daikominami Higashi-ku, Nagoya 461-8673, Japan
Department of Nursing, Gifu College of Medical Technology, 795-1 Nagamine, Ichihiraga, Seki 501-3822, Japan
Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumaicho Showa-ku, Nagoya 466-8550, Japan
December 1, 2000
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