抄録
We observed heart rate (HR), mean blood pressure (MAP), sweating rate (SR), and skin blood flow (SkBF) responses to mental task under different ambient temperatures (Ta), i.e., 12, 16, 20, and 24 °C. Seven subjects (27 ± 5 yrs, 64 ± 14 kg) underwent 2-min color word conflict test (CWT) after 2 minutes of data acquisition to establish a baseline following a 15-min resting period. All subjects wore long sleeve shirts and long pants. The SkBF was measured with a laser Doppler probe on the left index finger pulp, and the SR was measured with a ventilated capsule on the left thenar. Minute-by-minute data were calculated. CWT significantly increased the HR and MAP, while there was no significant effect of Ta on the magnitudes of these responses. CWT significantly decreased the SkBF when the Ta was 20 or 24 °C, whereas it significantly increased the SkBF when the Ta was 12 or 16 °C. SR was significantly increased by CWT, and it was significantly greater under 24 °C than under 12 and 16 °C conditions. These findings suggest that different ambient temperatures induce different finger skin blood flow responses to mental task, implying the independent nature of cutaneous vasomotor tone and sweat gland in glabrous skin. [J Physiol Sci. 2007;57 Suppl:S189]
