Abstract
In his previous report, the author stated that, with the dynamic muscular labour of the whole body, the concentration of lactic acid in the blood remarkably increases and that the concentration of pyruvic acid increases accordingly. In the case where excessive pyruvic acid is formed, the increase of the amount of the constituent factors of the Krebs' cycle in the tissue and the resultant outflow there of into the circulating blood is presumed. The author, thereupon, burdened 5 volunteers with dynamic ascending and desccending to and from a platform, pumbing mainly performed with upper extremities and with static box-holding under varying conditions in order to observe the changes in the concentration of citric acid in the blood serum . during their recovering stage. The followings are the outline of the results thus obtained.
1) When the conditions for these 3 kinds of labour were so changed that the maximum amotjnt of labour can be tolerated within the same length of time, the rate of increase in the concentration of citric acid in the blood serum became higher and the recovery also more delayed as the labour became more dynamic and the labour was performed more and more with the whole body.
2) when the rates of increase in the amount of citric acid in the blood serum in the cases of ascending and descending platform and pumping to the maximum amount was compared with those rates in the cases of the same labour but to only one half of the maximum amount of labour, the latters were found to be equivalent to roughly one half of the f ormers. Further, almost no increase was observed when burdened so as to establish a steady state.
3) when the maximum tolerable amount in a labour, which allows to continue for a short period of time such as static box-holding with the weight weighing 10 kg, the process of recovery generally showed a trend of more delay compared with the cases of other kinds of labour.
4) The peak of the increase in the concentration of citric acid in the blood serum appeared later compared with that of pyruvic acid. It appeared at about 15 minutes after the completion of the labour in a dynamic labour, and a trend of later appearance was seen in a static labour.
