Abstract
The authors investigated heart rate and relative metabolic ratio of five abult male subjects walking on the belt tread mill. There was found very close positive correlation between heart rate or increasing rate of heart rate and relative metabolic ratio (Tab. 1). The relation of these indexes can be shown by a simple equation y=ax+b, provided that coefficients a and b vary according to each subject (Fig. 3 and 4).
So that, once an equation of each subject has been given, the intensity of barn works may be assumed roughly only from the measurement of heart rate of the same subject in operation. But, heart rate seems to be more strongly affected than relative metabolic ratio by psycological factors. The authors intend to perform further investigations on the above relations of various work in and around the livestock barn.
