Petrofsky Jerrold Scott, Bains Gurinder, Raju Chinna, Lohman Everett, Berk Lee, Prowse Michelle, Gunda Shashi, Madani Piyush, Batt Jennifer
Department of Physical Therapy, Loma Linda University, Loma Linda, CA 92350, USA.
Arch Dermatol Res. 2009 Sep;301(8):581-5. doi: 10.1007/s00403-009-0957-3. Epub 2009 May 5.
Numerous studies have examined the effect of local and global heating of the body on skin blood flow. However, the effect of the moisture content of the heat source on the skin blood flow response has not been examined. Thirty-three subjects, without diabetes or cardiovascular disease, between the ages of 22 and 32 were examined to determine the relationship between the effects of dry vs. moist heat applied for the same length of time and with the skin clamped at the same skin temperature on the blood flow response of the skin. The skin, heated with an infrared heat lamp (skin temperature monitored with a thermocouple) to 40 degrees C for 15 min, was either kept moist with wet towels or, in a separate experiment, kept dry with Drierite (a desiccant) between the towels to remove any moisture. Before and after heat exposure of the forearm, blood pressure, heart rate, skin moisture content, skin temperature, and skin blood flow were recorded. The results of the experiment showed that there was no change in skin moisture after 15 min exposure to dry heat at 40 degrees C. However, with moist heat, skin moisture increased by 43.7%, a significant increase (P < 0.05). With dry heat, blood flow increased from the resting value by 282.3% whereas with moist heat, blood flow increased by 386% over rest, a significant increase over dry heat (P < 0.05). Thus, with a set increase in skin temperature, moist heat was a better heating modality than dry heat. The reason may be linked to moisture sensitivity in calcium channels in the vascular endothelial cell.
众多研究探讨了身体局部和整体受热对皮肤血流的影响。然而，热源的湿度对皮肤血流反应的影响尚未得到研究。对33名年龄在22至32岁之间、无糖尿病或心血管疾病的受试者进行了检查，以确定在相同时长且皮肤夹在相同皮肤温度下，干热与湿热作用的效果之间的关系，以及对皮肤血流反应的影响。用红外热灯加热皮肤（用热电偶监测皮肤温度）至40摄氏度并持续15分钟，皮肤要么用湿毛巾保持湿润，要么在另一个实验中，在毛巾之间用干燥剂（无水氯化钙）保持干燥以去除任何水分。在前臂受热前后，记录血压、心率、皮肤湿度、皮肤温度和皮肤血流。实验结果表明，在40摄氏度的干热环境中暴露15分钟后，皮肤湿度没有变化。然而，在湿热环境中，皮肤湿度增加了43.7%，这是一个显著的增加（P < 0.05）。在干热环境下，血流比静息值增加了282.3%，而在湿热环境下，血流比静息时增加了386%，比干热环境下有显著增加（P < 0.05）。因此，在皮肤温度设定升高的情况下，湿热是比干热更好的加热方式。原因可能与血管内皮细胞钙通道中的湿度敏感性有关。
