Exposure to a combination of heat and hyperoxia during cycling at submaximal intensity does not alter thermoregulatory responses

C Zinner; M Krueger; JL Reed; M Kohl-Bareis; H-C Holmberg; B Sperlich

doi:10.5604/20831862.1192041

eISSN: 2083-1862
ISSN: 0860-021X

Biology of Sport

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1/2016
vol. 33

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abstract:

Original paper

Exposure to a combination of heat and hyperoxia during cycling at submaximal intensity does not alter thermoregulatory responses

C Zinner

¹

,

M Krueger

^{2, 3}

,

JL Reed

⁴

,

M Kohl-Bareis

⁵

,

H-C Holmberg

⁶

,

B Sperlich

^{1, 6}

Department of Sport Science, University of Würzburg, Judenbühlweg 11, 97082 Würzburg, Germany
Institute of Training Science and Sport Informatics, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933 Cologne, Germany
The German Research Centre of Elite Sport, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933 Cologne, Germany
Faculty of Health Sciences, University of Ottawa, ON, Canada
University of Applied Sciences Koblenz, RheinAhrCampus Remagen, Germany
Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden

Biol. Sport 2016;33:71-76

DOI: https://doi.org/10.5604/20831862.1192041

Online publish date: 2016/02/24

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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 (Tcore) and skin (Tskin) 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°C or 33°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°C than 21°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°C than 21°C. In conclusion, during 30 min of submaximal cycling at 21°C or 33°C, Tcore, Tskin and Tbody, 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.

keywords:

Exposure to a combination of heat and hyperoxia during cycling at submaximal intensity does not alter thermoregulatory responses

C Zinner 1 , M Krueger 2, 3 , JL Reed 4 , M Kohl-Bareis 5 , H-C Holmberg 6 , B Sperlich 1, 6

Heat stress, Hyperthermia, Skin blood flow, Thermoregulation, Vasoconstriction

C Zinner

¹

,

M Krueger

^{2, 3}

,

JL Reed

⁴

,

M Kohl-Bareis

⁵

,

H-C Holmberg

⁶

,

B Sperlich

^{1, 6}