Abstract
The posture and heart rate of 7 chiansaw men were investigated. The results obtained are as follows.1) By Ovako Working Posture Analysis System, 82% of the posture of worker were classified into the operation under moderate work load, but 12% of that were classified into the operation under heavy burden. The posture under heavy burden appeared the operation of felling, i. e. undercutting and backcutting.2) The work intenity level equaled moderate physiological loads from the increasing rate of chainsaw men's heart rate, but the level of the % HRmax on older worker equaled or was over the upper limit of physical work capacity in 8 hours work. The higher heart rate appeared in the felling, the wedge driving and the walking with chainsaw on slope. Judging from the % HRmax, the optimum time in one continuous work and one rest would be estimated respectively about 50min. and 20min. in the heavy work, and about 100min., 25min. in moderate work.
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