| Keywords |
Vasoconstriction ; Vasodilation ; Capillaroscopy ; Pulse wave velocity(PWV) ; Feet immersion |
| Abstract |
Capillary plays an important role in dissipating the heat produced in the internal body. Although it is known that the range of vasoconstriction / vasodilation in the extremity changes according to the thermal environments, only indirect methods such as the measurement of skin temperature and skin blood flow have been mostly used. Therefore, this study was conducted to investigate the validity of capillary measurement with capillaroscopy, and the method of feet immersion in hot(HI) and cold(CI) water was used. Six male subjects participated in the investigation and capillary size, pulse wave velocity, skin and rectal temperature, etc. were measured. The results were as follows. Arterial and venous diameter were decreased in CI and increased in HI. Capillary sizes were correlated with mean skin temperature(p<.01). Flow velocity was the highest in HI, and was correlated with thermal sensation(r=0.626), humidity inside clothing at the chest(r=0.624), ring finger temperature(r=0.517)(p<.01). These results indicate that vasoconstriction or vasodilation can be measured directly and visually by using the capillaroscopy. |