The experiments were executed to elucidate the effects of three different kinds of T-shirt with double-face knitted fabrics on thermo-regulatory responses and clothing humidity during cyclic ambient temperatures (neutral→warm→neutral). The double knitted fabrics used in the present experiments were composed of the inside layer of polyester and the outside layer of cotton (A: C/P), the inside layer of cotton and the outside layer of polyester (B: P/C), and the inside layer of cotton and the outside layer of cotton (C: C/C). Main results are summarized as follows: 1) The increasing rates of clothing humidity were the slowest in C in comparison with those in A and B under the influences of an increase in an ambient temperature (Ta) from 28°C to 37°C in 30 min. 2) The level of clothing humidity was the lowest in C at Ta of 37°C. 3) The decreasing rates of clothing humidity were the quickest in C under the influences of Ta decrease from 37°C to 27°C in 30 min. 4) There did not exist any consistent differences in the amounts of sweating and the whole bodily weight loss due to evaporation through clothing among A, B and C. These findings are discussed in terms of thermal physiology and clothing sciences.

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