A relationship between an enhanced sensitivity of cutaneous vasodilation response to an increase in esophageal temperature and a component synchronizing with cardiac cycle in skin sympathetic nerve activity after heat acclimation in humans.

众所周知，热适应引起的血浆体积（PV）膨胀会增强高热人群的皮肤血管舒张。另一方面，我们发现在给定r波后1.1-1.3s潜伏期存在一个与心动周期同步的成分，该成分随着食道温度的升高而升高，而这种升高被低血容量显著抑制。在本研究中，我们已经证明热疗中同步成分的增加被热驯化后的PV扩张增强，这种增强可能与热驯化后热疗中皮肤血管舒张的增强有关。

It is well known that plasma volume (PV) expansion induced by heat acclimation enhances cutaneous vasodilation in hyperthermic humans. On the other hand, we have found that there was a component synchronizing with cardiac cycle in 1.1-1.3s latency after a given R-wave, which increased with the increase in esophageal temperature, and the increase was significantly suppressed by hypovolemia. In the present study, we have proved that an increase in the synchronizing component in hyperthermia was enhanced by PV expansion with heat acclimation, and the enhancement might be associated with an enhancement of cutaneous vasodilation in hyperthermia after heat acclimation.