The author investigeted the blood-types of the Japanese students who were the representative sprinters, fielders, swimmers and base-ball players of several universities in Tokyo.
The Dr. K. Yosizawa's method of testing blood-types by saliva was used, and the following results were obtained.
O Type 77 O3 0.2%
A Type 79 31.0%
B Type 66 25.8%
AB Type 33 13.0%
From above mentioned data the author could find out, that there was slight increase in the percentage of the B-type and decrease in that of the A-type, compared with the distribution of the blood-types among the ordinary Japanese. But these deviations from the standard percentages being too little to be taken into consideration, the author was inclined to conclude that there were no particular features in the distribution of the blood-types amomg athletes.