The following results were obtained by testing 2068 boys and girls in the eleme-ntary and junior high schools in Yaizu-shi, Shizuoka Prefecture : 1) The children of Yaizu-shi were shorter in stature and more endomorphic in build than the comparable group of Shuzenji district in Shizuoka. A slight retardation in the growth of their long bones was observed. Their measures of width-depth development and the muscular strength were inferior to those obtained from the other groups of same age level. 2) In the step test (height of the bench 35 cm, 30 steps per minute, for the duration of 3 minutes), boys ages from 6 to 13 years scored 65=70 with very small variation. In the same test, the girls scored similar to the boys, with the exceptions of ages 12 and 13 at which the scores dropped to 55 points. At age 14, the scores in the step test became high for the both sexes, reaching approximately 75 points. It seemed that the scores in the step test for the ages below 13 years are associate with the rate of work load to their leg muscles rather than with the cardio-vasular efficiency. 3) During the age period from 6 to 14 years, no variations associated with either sex or age were observed in the measure of lung capacity per an unit time. However, in the heart rate they are inferior to the adult standard. 4) The performances in vertical jump improved with the advancement of age for the boys. For the girls, however, very small improvement was registered after the age of 11 years. 5) The number of chinnings and the duration of hanging from the bar (with chinning position) improve with the advancement of age for the boys. For the girls, the duration of hanging time decreases after their age of 12 years. 6) The increment rate of the girls from age 6 to 14 years in the index “hanging time x weight” is approximately one-half of the boys' increment rate. 7) Tte increment rate of the girls from age 6 to 14 years in the index “vertical jump x weight” is approximately two-thirds of the boys' increment rate. 8) Thus the sex difference in motor ability becomes eminent after 13 years of age.
The differences between glucose and sucrose were investigated on their effects of the recovery process after exercise. After 17 hours fasting, male rats weighted 100-150g were forced to swim for three hours in 30°C warm water. Twenty percent solution of glucose or sucrose were administered orally by a stomach tube after the exercise. Results were as follows; 1) Low blood sugar levels caused by severe exercise were reduced by administration of sugar and hyperglycemia continued more than three hours, while the maximum blood sugar level in non-exercised group was shown at one hour after administration and it decreased to normal value by three hours. 2) Although there was very slight sugar left in digestive tract (stomach to ileum) at one hour after glucose administration, delaying of sugar absorption was remarkable in sucrose administered groups ; that is, 125.2 mg% and 20.9 mg% of sugar were measured at one and three hours, respectively, after giving of sucrose. 3) Glycogen contents in liver and muscle increased more than that before the exercise in glucose administered groups by three hours after swimming. The recovery was not remarkable in sucrose administered rats, especially in liver. 4) Total protein concentrations in serum were kept almost the same in all groups. Transaminase activities (GOT & GPT) in serum were increased slightly after exercise, however, lactic dehydrogenase activities were decreased. No special changes in enzyme acitvity of serum were found amoung the experimental groups treated with sugars.
To reveal the limiting factors in endurance running on the treadmill was the main interest in this study. An excellent Japanese long distance runner who later got the third place at the Olympic marathon race in 1964, K. Tsuburaya, 23 served as the subject. The all-out running time, heart rate, respiratory rate, pulmonary ventilation and oxygen intake were measured when he ran at the two different speeds, 260m/min. and 240m/min., on the treadmill with 8.6% slope. From these measurements tidal volume, oxygen removal and oxygen pulse were calculated. The all-out running time of this subject was found to be 6 minutes 58 seconds at the speed of 260m/min. and 21 minutes 09 seconds at the speed of 240m/min.. The heart rate and respiratory rate were increased during running toward the point of “all-out”. It is worthy to note that the respiratory rate showed an abrupt increase near the point of exhaustion accompanied by decrease of tidal volume. The oxygen removal, the raito of oxygen intake to pulmonary ventilation, was also decreased gradually during running until it decreased to about 35 near the point of “all-out”. It was supposed from these results that the decrease of efficiency of respiratory function might play a big role to limit the endurance for running. It should be, in the next step, decided whether this decay of efficiency of the respiration would be caused by decreased cardiac output or uneven distribution of gas in the lung.