The author reported that in the questionnaire survey for female students, it was 50.4% who had poor circulation, and pointed out that the subjective symptom of poor circulation inflicted female students most. Therefore positive measures for the poor circulation are demanded. The author thought in a precedent study that the most effective way was to keep the limbs end warm.
　This study is to perform the subject experiment with special pants (Heat Navi Easy Pants:HN) which are said to be effective in keeping lower limbs warm. HN was the product of the use of activeness thermal insulation material. Two kinds of pants were used; one was HN and the other was J which was the product of the use of regular polyester fiber.
　The result of the experiment showed that heat retention of HN is higher indoors than outdoors, it is confirmed that HN absorbs not only the light of the sun but also artificial illumination without missing every single wavelength of light. On this account heat retention is considered to remain at any place if there is only light in wearing HN.
　Comparing one group who had poor circulation in the HN wearing with the other one who had no poor circulation from the skin surface temperature, there was a difference observed in the Max. temperature, but obviously there was no difference shown in the Min. temperature and the Mean temperature. It was not made clear that there was any relation of whether one has poor circulation awareness or not with the skin surface temperature in lower limbs, but the result was interesting because there was not any significant difference in the Min. temperature and the Mean temperature between poor circulation group and no poor circulation one. My judgement is in suggesting that wearing of HN should be effective on the poor circulation group. HN has been originally developed as sportswear, but it benefits the heat retention inside the room. Therefore, its development into casual wear can be expected in the future.

DESCENTE SPORTS SCIENCE Vol.32/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE