Relations between Heart Rate and Energy Metabolic Ratio (Continued Report)

Abstract

The authors investigated heart rate and relative metabolic ratio of five adult male subjects practicing various tasks (Tab. 1). There was found very close positive correlation between heart rate and relative metabolic ratio (Tab. 2). The relation of these two indexes could be shown by a simple equation y=ax+b (x: heart rate, y: relative metabolic ratio). Numeral values of coefficients a and b, however, not only varied with every subject, but also differed from those obtained from the previous experiment by a tread-mill. That is, at a certain work intensity of a certain subject, heart rate of this experiment was a little more than that of the previous under the condition of relatively higher intensity, and less under lower intensity. These differences seemed to be chiefly due to the intensity of nervous load, which was related to autonomousness of the subject's exercise affected by various experimental conditions.
It may be concluded that the mathematical conputation of relative metabolic ratio based on heart rate was proved to be not so much precise. But, with pretty wide latitude, heart rate is proportional to the intensity of work load, and reflects the change of intensity even during a short time more easily than relative metabolic ratio.
The authors intend to investigate heart rate of various jobs and work elements and to point out problems to be studied for the reduction of work loads, in and around the livestock barn.