In order to investigate the effects of sportswears at games exposed to the high-speed air flow on skin temperature, the temperature change by a speeding motorcycle was measured as an example. From the results, the better way to wear was considered in aspects on air permeability and wind-resistance of fabrics applying a model simulation.
　1) Field work
　A rider in two kinds of sportswear rode on speedways at two kinds of speed. The skin temperature changing was more highly correlation with the atmospheric on riding comparing resting. The skin temperature of the covered body region with fabrics as well as the uncovered body dropped by riding, and the degree was larger at breast and the abdomen, and smaller at the back.
　2) Simulation
　The air permeability of the fabrics exposed to the high-speed air flow was measured on the wool gaberdine, the cotton broadcloth, the cotton knitted fabric and several kinds of sporting knitwear. The effects of the air permeability of fabrics under the high-speed air flow on skin temperature were examined by using the cylindrical thermo-integrator. Exposing the tightly fabric-covered integrator to the air flow, the surface temperature of it dropped down. The degree was larger at the front, and smaller equally at the other parts. On the loosely fabric-covered integrator, the same tendency was recognized too.
　The relationship between the wind-resistance and the material of fabrics was examined under the high-speed air flow by means of the wind-resistance tester. The higher speed of air flow, the larger was the resistance. But it was shown that the resistance decreased temporaly in some region of the speed, and it again increased with the speed. The rougher surface and the more air permeability of fabrics, the region was in the lower speed.

DESCENTE SPORTS SCIENCE Vol.10/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE