Mohler F S, Heath J E
Department of Physiology and Biophysics, University of Illinois, Urbana 61801.
Am J Physiol. 1988 Feb;254(2 Pt 2):R389-95. doi: 10.1152/ajpregu.1988.254.2.R389.
The temperature of the pinnae of male New Zealand White rabbits was measured by use of infrared thermography. At ambient temperatures of 15, 20, and 25 degrees C, the average pinna temperatures were 23.0, 28.7, and 36.2 degrees C, respectively. From these temperatures, average heat loss from the total pinna surface area was calculated to be 2.8, 3.3, and 4.4 W, respectively. Preoptic temperature changes also affect the vasomotor state of the rabbit. At an ambient temperature of 20 degrees C, cooling the preoptic area of the rabbit by approximately 1 degree C resulted in an average pinna temperature of 26.5 degrees C and a heat loss of 2.4 W. Heating the preoptic area by approximately 1 degree C resulted in an average pinna temperature of 33.5 degrees C and a heat loss of 5.4 W. Finally, pinna temperatures were measured by use of a thermocouple and infrared thermography simultaneously. When the pinnae were vasodilated, the thermocouple measurements were consistently higher than the pinna surface temperatures measured thermographically. When the pinnae were vasoconstricted, the thermocouple measurements were consistently lower than the pinna surface temperatures measured thermographically. The discrepancy between the two methods of measurement is discussed.
通过红外热成像法测量雄性新西兰白兔耳廓的温度。在15、20和25摄氏度的环境温度下，耳廓的平均温度分别为23.0、28.7和36.2摄氏度。根据这些温度，计算得出耳廓总表面积的平均热损失分别为2.8、3.3和4.4瓦。视前区温度变化也会影响兔子的血管舒缩状态。在20摄氏度的环境温度下，将兔子的视前区冷却约1摄氏度，导致耳廓平均温度为26.5摄氏度，热损失为2.4瓦。将视前区加热约1摄氏度，导致耳廓平均温度为33.5摄氏度，热损失为5.4瓦。最后，同时使用热电偶和红外热成像法测量耳廓温度。当耳廓血管舒张时，热电偶测量值始终高于热成像法测量的耳廓表面温度。当耳廓血管收缩时，热电偶测量值始终低于热成像法测量的耳廓表面温度。讨论了两种测量方法之间的差异。
