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Publication AbstractsFinger Cold-Induced Vasodilation During Mild Hypothermia, Hyperthermia and at ThermoneutralityHenricus A.M. Daanen, M.Sc., Ph.D., and Michel B. Ducharme, M.Sc., Ph.D.Aviat Space Environ Med 1999; 70:1206-10 AbstractBackground: Exposure of the fingers to severe cold leads to cold-induced vasodilation (CIVD). The influence of ambient temperature on the CIVD-response is well understood and documented, but the response of CIVD to hyperthermia and mild hypothermia has rarely been investigated. Methods: To investigate the influence of body thermal status on the CIVD response, eight subjects immersed their right hand in 5°C water for 40 min during mild hypothermia (C), thermoneutrality (N) and hyperthermia (W). The mean skin temperature of the body (T(overbar)sk), the esophageal temperature (Tes), the temperature of the volar side of the distal phalanx of each immersed finger (Tfi) and the skin perfusion of the immersed middle finger (Qsk) were continuously measured. Results: During the W condition the body temperatures were higher (Tes: 38.0 ± 0.1°C; T(overbar)sk: 37.9 ± 0.7°C) than during N (Tes: 36.8 ± 0.2°C; T(overbar)sk: 31.8 ± 0.7°C) and during C (Tes: 36.1 ± 0.8°C; T(overbar)sk: 21.2 ± 1.9°C). T(overbar)fi and Qsk were higher during the W condition (T(overbar)fi: 16.5 ± 2.3°C; Qsk: 133 ± 53 perfusion units (PU)) than during N (T(overbar)fi: 8.1 ± 1.7°C; Qsk: 57 ± 39 PU) and during C (T(overbar)fi: 6.8 ± 1.2°C; Qsk: 22 ± 14 PU). The onset time of CIVD was significantly prolonged in condition C (13.0 ± 3.8 min) as compared with N (7.2 ± 2.2 min). Conclusion: It was concluded that the CIVD response is significantly affected by body core and skin temperatures.Keywords: laser Doppler flowmetry, finger blood flow, hunting response, hypothermia, hyperthermia. Information on subscribing, and on obtaining copies of an article or of an entire issue. Table of Contents for Volume 70, Number 12 of the ASME journal.
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