We want to measure the physiological load of forest worker by use the energy consumption, as the same evaluation indicate.
But, it is difficult to measure the energy consumption during forest work. And the equipment of energy consumption is very expensive.
In this study, we measured the heart rate and energy consumption of many subjects by using Harver step test in laboratory, and next measured about heart rate during 24 hours.
There is large correlation between the heart rate and energy consumption about each subject, but it is difficult to display one regression line.
In the case of basic heart rate in sleep time, there is no individual variations. But this new equation, it will be possible to estimate energy consumption from relative heart rate, when we estimate physiological load of labour at forest work.
Key word: Forest work; Physiological load; heart rate; energy consumpution; ralative heart rate.