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J Appl Physiol (March 22, 2002). doi:10.1152/japplphysiol.00873.2001
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Articles in PresS, published online ahead of print March 22, 2002
J Appl Physiol, 10.1152/jap.00873.2001
Submitted on August 24, 2001
Accepted on February 1, 2002

Inhalation of Warm and Cold Air Does Not Influence Brain Stem or Core Temperature in Normothermic Humans

Igor B Mekjavic1*, Klemen Rogelj2, Maja Radobuljac2, and Ola Eiken3

1 Institute of Biomedical and Biomolecular Sciences, University of Portsmouth, Portsmouth, United Kingdom; Department of Automation, Biocybernetics and Robotics, Institute Jozef Stefan, Ljubljana, Slovenia
2 Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
3 Swedish Defence Research Agency, Karolinska Institutet, Stockholm, Sweden

* To whom correspondence should be addressed. E-mail: igor.mekjavic{at}ijs.si.

The present study tested the hypothesis that inhalation rewarming provides a thermal increment to central neural structures adjacent to the nasopharyngeal region. Auditory evoked brain stem responses (AEBRs) of fourteen subjects (7 male and 7 female) were monitored for 25 minutes while they inspired room air (24°C) followed by hot air (41°C) saturated with water vapour and cold dry air. The latencies of peaks I, III and V, and the interpeak latencies (IPLs) I-III, III-V, and I-V were compared between the three conditions with a repeated measures ANOVA. Changes in IPLs are sensitive makers of changes in brain stem temperature. Tympanic temperature (Tty) was measured with an infra-red tympanic thermometer. There were no significant differences in Tty, peak latencies I, III, and V, and IPLs I-III, III-V, and I-V. The results indicate that inhalation of hot and cold air does not influence Tty, nor does it influence the temperature of the brain stem. We conclude that inhalation rewarming is not capable of warming the vital central neural structures adjacent to the naropharynx.




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