Exposure to a combination of heat and hyperoxia during cycling at submaximal intensity does not alter thermoregulatory responses [Elektronisk resurs]
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Zinner, C. (författare)
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Krueger, M. (författare)
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Reed, J. L. (författare)
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Kohl-Bareis, M. (författare)
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Holmberg, Hans-Christer (författare)
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Sperlich, Billy (författare)
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Mittuniversitetet Fakulteten för humanvetenskap (utgivare)
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NVC (medarbetare)
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NVC (medarbetare)
- 2016
- Engelska.
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Ingår i: Biology of Sport. - 0860-021X. ; 33:1, 71-76
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Sammanfattning
Ämnesord
Stäng
- 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.
Ämnesord
- Medical and Health Sciences (hsv)
- Health Sciences (hsv)
- Sport and Fitness Sciences (hsv)
- Medicin och hälsovetenskap (hsv)
- Hälsovetenskaper (hsv)
- Idrottsvetenskap (hsv)
Indexterm och SAB-rubrik
- Heat stress
- Hyperthermia
- Skin blood flow
- Thermoregulation
- Vasoconstriction
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