Department of Physical Therapy, Loma Linda University, Loma Linda, California, USA.
Diabetes Technol Ther. 2011 Mar;13(3):365-72. doi: 10.1089/dia.2010.0161. Epub 2011 Feb 3.
When heat is applied to the skin, heat is conducted away because of the latent heat transfer properties of the skin and an increase in skin circulation, but little attention has been paid to the heat transfer properties of skin in different areas of the body and in people with diabetes. research design: Thirty subjects in the age range of 20-75 years had a thermode (44°C) applied to the skin of their arm, leg, foot, and back for 6 min to assess the heat transfer characteristics of skin in these four areas of the body. Skin blood flow and skin temperature were monitored over the 6-min period.
For the younger subjects, blood flow was not statistically different in response to heat in three areas of the body, starting at less than 200 flux measured by a laser Doppler imager and ending at approximately 1,200 flux after heat exposure. The foot had higher resting blood flow and higher blood flow in response to heat. Temperature and the rate of rise of temperature were also not different in any of the areas. The heat added to raise temperature, however, varied by body region. The arm required the least, whereas the leg and foot required the most. For the older group and subjects with diabetes, the heat required for any region of the body was much less to achieve the same increase in skin temperature, and blood flows were also much less; the subjects with diabetes showed the least blood flow and required the fewest calories to heat the skin. Whereas the foot required the greatest number of calories to heat the tissue in younger and older subjects, in subjects with diabetes, the foot took proportionally fewer calories.
Thus, specific areas of the body are damaged more by diabetes than other areas.
当热量施加于皮肤时，由于皮肤的潜热传递特性和皮肤循环的增加，热量会被传导走，但很少有人关注身体不同部位和糖尿病患者的皮肤传热特性。
30 名年龄在 20-75 岁的受试者将热模（44°C）应用于其手臂、腿部、脚部和背部的皮肤 6 分钟，以评估身体这四个部位的皮肤传热特性。在 6 分钟的时间内监测皮肤血流量和皮肤温度。
对于年轻的受试者，血流量在三个身体区域的热刺激下没有统计学差异，起始时通过激光多普勒成像仪测量的血流量小于 200 通量，暴露于热后结束时约为 1200 通量。脚部的静息血流量较高，对热的血流量也较高。在任何区域，温度和温度上升率也没有差异。但是，增加热量以升高温度的量因身体区域而异。手臂所需的热量最少，而腿部和脚部则需要最多。对于年龄较大的组和糖尿病患者，任何身体部位所需的热量都要少得多，才能使皮肤温度升高相同，血流量也少得多；糖尿病患者的血流量最少，加热皮肤所需的热量也最少。虽然脚部在年轻和年长受试者中需要最多的热量来加热组织，但在糖尿病患者中，脚部所需的热量比例较少。
因此，与其他部位相比，身体的特定部位受到糖尿病的影响更大。
