Analysis of Working Posture and Intensity of Work in the Dairy Barn

Abstract

As the preliminary study for the analysis of management work in the dairy barn, the author investigated the relationships between increasing rate of heart rate and relative metabolic ratio (RMR) by static and dynamic muscular works.
The following experiments were carried out:
(1) Measurement of heart rate and RMR of an adult male subject when he walks on the belt tread mill as dynamic muscular work.
(2) Measurement of heart rate and RMR of the subject when he holds one or two heavy things by various postures as static muscular work (Fig. 2)
The results obtained are as follows.
1) There was a very close positive correlation between increasing rate of heart rate and RMR in each case of static and dynamic muscular works (Table 1). The relation of these two indexes could be shown by a linear equation Y=aX+e (Y: increasing rate of heart rate, X: RMR, a: coefficient, e: error).
2) Numeral values of coefficient a varied with a character of work, that is, the coefficient a of static muscular work is larger than that of dynamic muscular work.
3) For static muscular works, the coefficient a varied a little with work posture, and was from 11.92 at bending forward posture (1) to 7.95 at sitting posture.
The suthor intends to determine the value of coefficient a of management work in the dairy barn.