The purpose of this study is to conduct the examination of heart rate and speed variations with respect to the various interval trainings of swimming. One trained, one post-trained and one untrained swimmers were employed for this study. The experiment was conducted during the summer of 1968. The temperature of atomosphere varied from 30°C to 33°C and that of water from 27°C to 29°C.
The data of heart rate were obtained from the record of ECG. Two electrodes or ECG consisting of silver cups of 10mm in diameter were attached to the skin over sternum. In order to avoid mechanical and electrical disturbances, the electrodes were tightly fixed through the following procedures;
1) The electrodes were pasted on cleaned skin with ECG jelly.
2) The adhesive plaster was placed over the electrodes.
3) The adhesive plaster was coated with wax.
The wire of 20 meters was used to connect the electrodes and the recorder. On trial of interval training was consisted of two phases; 1) The active phase....To swim 50 meters according to his swimming ability. 2) The rest phase...To take a 0, 5, 10, 20, 30, 45 or 60 seconds interval between each 50 meters swimming. Each trial of training was repeated ten times.
Results are as follows;
1) The longer the rest period is, the higher the swimming speed is.
2) All swimmers swim 50 meters at 60-80% of their maximum speed and the percent of the trained is higher than that of the untrained.
3) Maximum heart rates of the trained, the post-trained and the untrained during tenth swimming are 188, 180 and 173 respectively, which are the same in every trial.
4) Decreasing rates of heart rate during the rest period are 10 under in 5-10 seconds interval, 15-25 in 20-30 seconds interval and 20-50 in 45-60 seconds interval,

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A new measuring apparatus of earth-attached planter area was devised and by use of this apparatus the earth-attached planter area of the various subjects mentioned below was measured. The relation between the area and constitution and physical fitness, the daily change of the area in camp for training, and the increase and decrease of the area before and after training, were studied. Furthermore, the increasing-decreasing experiment of the area was carried out and the obtained results were as followed:
1) How the earth-attached planter area was changed with different postures was examined. Comparing the area in an straight position with that in a position of bending forward and backward, the former showed larger value than the latter. Therefore, it was suggested that the straight position should be chosen as a standard posture fit for measurement.
2) The relation between the area and the records of height, body weight, 50m running, vertical jump and broad jump was investigated.
There existed no relationship between the area and the records of 50m running, vertical jump and broad jump, but the corelationship between the area and the records of height and body weight.
3) When the area of the students of some women's physical education college in Tokyo was compared before and after training in camp, the area of them after training had the increasing tendency.
4) It was a pattern of its daily change that it showed the minimum at awaking, then, gradually increasing, the maximum before sleeping.
5) How the area before and after exercise on both tiptoes was changed, and how the area before and after exercise of standing on one leg was changed, were investigated, which resulted in decreasing of the area after both exercises.
6) When the area after immersing in 20°C water was compared with that after in 35°C water, there was found some thermal effect on the area but no definite tendency.
7) To observe the relation between the area and circulatory system, the thigh was tied up by a pressure band for 2 min and then the area was measured. To some extent the change of the area before and after tied up was observed.
8) After loading exercise, the increased area, pulse rate and blood pressure were observed, which would suggest that there could exist some relationship among them.
9) In the same way mentioned above, there found some relationship among the area, plethysmography and E.C.G.
10) The angular change of the planter arch was compared by X-ray pictures before and after exercise. However, there found no particulr change of it, e. g. it could be said that there would be no relation between the earth-attached planter area and the angle of the planter arch.

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The effects of maternal physical exercise during eary pregnancy upon the embryonic development of mice were studied as follows: A/Jax female mice at 10 to 16 weeks of age were imposed daily compulsory running at the speed of 15 meter/min. using a tread mill for 100 min. for the period from zero to 6th day of gestation (called severe exercise group) and for 50 min. from zero to 13th day of gestation (called mild exercise group) respectively. All mice together with the control group without the exercise were sacrificed at 18th day of gestation and the states of concep.uses as well as external and skeletal development of fetuses were observed. The results may be summarized as follows:
1.Significant pregnancy-blocking effect was found in the severe exercise group and it is presumed that the treatment caused obstruction of implantation or maintaince of early pregnancy after implantation in most cases.
2. No significant differences were observed in litter size, fetal mortality, fetal body weight and frequency of the malformed fetuses between pregnant mothers of each of experimental group and control group.
3. The progress of ossification in the mild exercise group was slightly superior in some part of the skeleton to that of the control group.

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