In this report, the workers' heart-rates and onecontinuous work period for forest brush-cutting on a steep area are discussed. After measurements, data were analyzed by the quantification method and the method of multiple regressions. The % HR
max during one continuous work period was more than 60% for nearly all cases with a maximum of 75%. The data indicated that forest brush-cutting on a steep area is difficult and potentially stressful work. The % HR
max was significantly effected by the machine used (
p<0.01), the weather (
p<0.01) and the worker (
p<0.01). The % HR
max was the largest for work by a 8.3 kg hand-type brush-cutter, whereas the smallest for work by a scythe. For the factor of weather, the results showed the largest % HR
max during light rains and the smallest during cloudy times. The one-continuous work period had an inverse relationship with % HR
max The results also indicated that the recovery of heart-rate to normal is faster in the morning than in the afternoon and also faster at a lower temperature than at a higher temperature when the temperatures are more than 20°C.
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