Effects of exercise intensity, seasonal variation and the type of clothing on changes in non-evaporative heat loss from the human hand [HL (R+C)] were observed in four healthy men exercised for 60 min on bicycle ergometer at 20, 35 and 45% VO₂max at an ambient temperature of 20℃ and a relative humidity of 50%. HL (R+C) increased with rising esophageal temperature (Tes) during exercise. The slope indicating the relationship between HL (R+C) and Tes decreased with rising exercise intensity. Increase in HL (R+C) was higher in summer than in winter at a given exercise intensity. HL (R+C) at rest and the end of exercise was larger than that for the corresponding area of the hand with increasing area covered by clothing from 12% to 93% of the body surface area. These results indicate that the heat loss from the hand plays a significant role for the thermoregulation when sports wear was worn.

DESCENTE SPORTS SCIENCE Vol.2/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE