PHYSICAL WORK LOAD ON AND DERMATOSES OF FEET OF DAM WORKERS STANDING ON AN INCLINED PLANE
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概要
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Physical work load on and skin changes of feet of workers dealing with asphalt paving of a large rock-filled dam surface with an inclination of 27.5 degrees were investigated. While the operators of finishing machines stayed mostly on their machines, workers dealing with supplementary and miscellaneous work, all being elderly farmers working part time for a subcontractor, spent more than 70 % of their working time standing on an evenly inclined surface. The work flow among these standing workers was restricted by the conditions of the finishing machines resulting in a variety of work patterns and in frequent changes in working positions. According to oxygen intake and heart rate measurements, work by standing workers was physically moderate but ascending and descending on the smooth slope were much more difficult than level walking. Feelings of general fatigue were more frequent among machine operators, while tiredness in the legs remarkably increased in standing workers. The latter had higher fatigue rates for the posterior part of lower legs, ankle, and sole than the former. Painful callosities and burn scars were frequently observed on the soles of the feet of standing workers. These symptoms are most likely connected to the peculiar standing postures on steep and smooth inclinations and with the heated asphalt surface.
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