On the Effects of Water-temperatures on Respiration and Circulation Function

In the case of physical exercises in water, whose temperatures are divided into 5 stages with the step of 4℃ from 20℃ to 36℃, the author studies how much influence those temperatures have on the respiration and circulation function of a human body. The obtained results are as follows: (1) The rate of increase in the number of pulsation is different at each water-temperature and the number of pulsation is least at 24℃. (2) The rate of increase in the number of respiration becomes higher at either 20℃ or 30℃ and 36℃ with the passing of time. (3) The metabolic activity with the consumption of oxygen is rapidly stimulated with the commencement of exercise at each temperature and this tendency is more conspicuous as the temperature becomes lower or higher. (4) There is no parallel relation between the number of pulsation and the consumption of oxygen. (5) The required quantity of oxygen is least at 24℃ and increases by steps as the temperature becomes higher than it. (6) Immediately after the exercise or just before leaving the water both the rate of increase in the number of pulsation and the quantity of oxygen consumed have a tendency of increase as being higher or lower than 24℃