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Exposure to a combination of heat and hyperoxia during cycling at submaximal intensity does not alter thermoregulatory responses
Univ Wurzburg, Dept Sport Sci, Judenbuhlweg 11, D-97082 Wurzburg, Germany.
German Sport Univ Cologne, Inst Training Sci & Sport Informat, Sportpk Mungersdorf 6, D-50933 Cologne, Germany.
Univ Ottawa, Fac Hlth Sci, Ottawa, ON K1N 6N5, Canada.
Univ Appl Sci Koblenz, RheinAhrCampus Remagen, Landau, Germany.
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2016 (Engelska)Ingår i: Biology of Sport, ISSN 0860-021X, E-ISSN 2083-1862, Vol. 33, nr 1, s. 71-76Artikel i tidskrift (Refereegranskat) Published
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Abstract [en]

In this study, we tested the hypothesis that breathing hyperoxic air (FinO2 = 0.40) while exercising in a hot environment exerts negative effects on the total tissue level of haemoglobin concentration (tHb); core (T-core) and skin (T-skin) temperatures; muscle activity; heart rate; blood concentration of lactate; pH; partial pressure of oxygen (PaO2) and carbon dioxide; arterial oxygen saturation (SaO2); and perceptual responses. Ten well-trained male athletes cycled at submaximal intensity at 21 degrees C or 33 degrees C in randomized order: first for 20 min while breathing normal air (FinO2 = 0.21) and then 10 min with FinO2 = 0.40 (HOX). At both temperatures, SaO2 and PaO2, but not tHb, were increased by HOX. Tskin and perception of exertion and thermal discomfort were higher at 33 degrees C than 21 degrees C (p < 0.01), but independent of FinO2. Tcore and muscle activity were the same under all conditions (p > 0.07). Blood lactate and heart rate were higher at 33 degrees C than 21 degrees C. In conclusion, during 30 min of submaximal cycling at 21 degrees C or 33 degrees C, T-core, T-skin and T-body, tHb, muscle activity and ratings of perceived exertion and thermal discomfort were the same under normoxic and hyperoxic conditions. Accordingly, breathing hyperoxic air (FinO2 = 0.40) did not affect thermoregulation under these conditions.

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2016. Vol. 33, nr 1, s. 71-76
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Heat stress, Hyperthermia, Skin blood flow, Thermoregulation, Vasoconstriction
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Idrottsvetenskap
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URN: urn:nbn:se:miun:diva-27823DOI: 10.5604/20831862.1192041ISI: 000370854600011PubMedID: 26929473Scopus ID: 2-s2.0-84964928529OAI: oai:DiVA.org:miun-27823DiVA, id: diva2:934234
Tillgänglig från: 2016-06-08 Skapad: 2016-06-07 Senast uppdaterad: 2019-01-31Bibliografiskt granskad

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