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J Occup Health year 2000 volume 42 number 6 page 315 - 320
Classification Original
Title Strength and Perceived Exertion in Isometric and Dynamic Lifting with Three Different Hand Locations
Author Shoko ANDO1, Yuichiro ONO2, Midori SHIMAOKA3, Shuichi HIRUTA3, Yoji HATTORI4, Fumiko HORI5, Toshihiko IMAEDA2 and Yasuhiro TAKEUCHI6
Organization 1Nagoya University School of Health Sciences,
2Fujita Health University School of Medicine, Department of Public Health,
3Nagoya University, Research Center of Health, Physical Fitness, and Sports,
4Daido Institute of Technology, Department of Physical Education,
5Gifu College of Medical Technology and
6Nagoya University Graduate School of Medicine, Department of Occupational and Environmental Health
Keywords Strength, Perceived exertion (CR-10), Isometric lifting, Dynamic lifting, Hand location
Correspondence S. Ando, Nagoya University School of Health Sciences, 1-1-20 Daikominami, Higashi-ku, Nagoya 461-8673, Japan
Abstract Strength and Perceived Exertion in Isometric and Dynamic Lifting with Three Different Hand Locations: Shoko ANDO, et al. Nagoya University School of Health Sciences-The dynamic and isometric strength and physical stress in symmetric and asymmetric lifting were measured with some common pairs of hand locations and a pair of clearly defined foot positions. In the experiment, eleven healthy male students were required to lift a small box attached to the arm of a dynamometer. The size of the box was 29 cm long, 24.5 cm wide and 23 cm high, and it weighed 10 kg. Both hands were located at three different positions on the box; the two handles near the upper edges of the box gripped with the hands (Handle type), the bottom on either side (Bottom type), and the left lower proximal corner and the right upper distal corner (Oblique type). The dynamic and isometric forces at the three hand locations were significantly different, and the least values were observed in the Oblique type irrespective of the lifting angle. Perceived exertions on the category scale (CR-10) for the left arm were very high in Oblique type lifting with any combination of height and symmetry during dynamic lifting. Therefore the burden of Oblique type lifting was thought to be greater than in the other two types of lifting, if workers are ordered to handle a box in otherwise identical conditions. In dynamic lifting Handle type lifting was thought to be the best among the three types.