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Thermoregulatory responses to combined moderate heat stress and hypoxia

Low, DA and Bailey, TG and Cable, NT and Jones, H Thermoregulatory responses to combined moderate heat stress and hypoxia. Microcirculation. ISSN 1549-8719 (Accepted)

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Objective: The aim of this study was to examine the cutaneous vascular and sudomotor responses to combined moderate passive heat stress and normobaric hypoxia. Method: Thirteen healthy young males, dressed in a water-perfused suit, underwent passive heating (Δcore temperature ~0.7 °C) twice (NORMOXIA; 20.9% O2 and HYPOXIA; 13% O2). Chest and forearm skin blood flow (SkBF; laser Doppler flux), local sweat rate (SR; capacitance hygrometry) and core (intestinal pill) and skin temperatures, were recorded. Results: HYPOXIA reduced baseline oxygen saturation (98±1 vs. 89±6%, P<0.001) and elevated chest (P=0.03) and forearm SkBF (P=0.03) and HR (64±9 vs. 69±8 beats.min-1, P<0.01). During heating, mean body temperature (T ̅BODY) thresholds for SkBF (P=0.41) and SR (P=0.28) elevations were not different between trials. The SkBF: T ̅BODY linear sensitivity during the initial phase of heating was lower at the Chest (P=0.035) but not different at the forearm (P=0.17) during HYPOXIA. With increasing levels of heating chest SkBF was not different (P=0.55) but forearm SkBF was lower on the forearm (P<0.01) during HYPOXIA. Chest (P=0.85) and forearm (P=0.79) SR:T ̅BODY linear sensitivities were not different between trials. Conclusion: Whilst sudomotor responses and the initiation of cutaneous blood flow elevations are unaffected, hypoxia differentially effects regional SkBF responses during moderate passive heating.

Item Type: Article
Uncontrolled Keywords: 11 Medical And Health Sciences
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Wiley: 12 months
Date Deposited: 12 Jul 2016 10:23
Last Modified: 12 Jul 2016 10:23
URI: http://researchonline.ljmu.ac.uk/id/eprint/3878

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