Evaluation of Infrared Thermometry of Tympanic Cavity as an Indicator of Core Temperature
Final rept. 19990-1991
NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA
Pagination or Media Count:
This study examined relationships among rectal Tr, esophageal T., and tympanic Ty membrane left and right responses during exercise in high ambient temperatures. Tr, Te, Tty, and skin Tsk temperatures were recorded on 11 subjects Under the following conditions A at rest in room temperature 20 to 22 deg C B at rest in a climatic chamber 48 to 51 deg C C cycle ergometry exercise at IOOW in a climatic chamber 48 to 51 deg C and D at rest in room temperature 20 to 22deg C. In conditions A, B and C, ice was applied to the f ace and neck f or 1-min intervals. In condition D, four of the subjects were exposed to air currents. In condition A, Tty correlated with T, and T., whereas in conditions B and C, Tty remained consistently higher than at all other temperature sites. During condition C, only Tty and Tsk decreased in response to ice application. In condition D, exposure to a fan resulted in temperature decreases at all sites however, the only significant changes were observed in Tty. The Tty fluctuations suggest that the tympanic membrane is an unstable measurement site in high heat and exercise conditions, a well as in changing environmental conditions. Tympanic, Infrared thermometry, Core temperature, Heat stress.
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