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Restoring heat stre...
Restoring heat stress-associated reduction in middle cerebral artery velocity does not reduce fatigue in the heat
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Keiser, S. (author)
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Fluck, D. (author)
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Stravs, A. (author)
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Huppin, F. (author)
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- Lundby, Carsten (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kost- och idrottsvetenskap,Department of Food and Nutrition, and Sport Science
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(creator_code:org_t)
- 2015-05-06
- 2015
- English.
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In: Scandinavian Journal of Medicine & Science in Sports. - : Wiley. - 0905-7188. ; 25:S1, s. 145-153
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Abstract
Subject headings
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- Heat-induced hyperventilation may reduce PaCO2 and thereby cerebral perfusion and oxygenation and in turn exercise performance. To test this hypothesis, eight volunteers completed three incremental exercise tests to exhaustion: (a) 18 degrees C ambient temperature (CON); (b) 38 degrees C (HEAT); and (c) 38 degrees C with addition of CO2 to inspiration to prevent the hyperventilation-induced reduction in PaCO2 (HEAT+CO2). In HEAT and HEAT+CO2, rectal temperature was elevated prior to the exercise tests by means of hot water submersion and was higher (P<0.05) than in CON. Compared with CON, ventilation was elevated (P<0.01), and hence, PaCO2 reduced in HEAT. This caused a reduction (P<0.05) in mean cerebral artery velocity (MCAv(mean)) from 68.6 +/- 15.5 to 53.9 +/- 10.0cm/s, which was completely restored in HEAT+CO2 (68.8 +/- 5.8cm/s). Cerebral oxygenation followed a similar pattern. was 4.6 +/- 0.1L/min in CON and decreased (P<0.05) to 4.1 +/- 0.2L/min in HEAT and remained reduced in HEAT+CO2 (4.1 +/- 0.2L/min). Despite normalization of MCAv(mean) and cerebral oxygenation in HEAT+CO2, this did not improve exercise performance, and thus, the reduced MCAv(mean) in HEAT does not seem to limit exercise performance.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Idrottsvetenskap (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Sport and Fitness Sciences (hsv//eng)
Keyword
- Brain blood flow
- PaCO2
- exercise performance
- cerebral oxygenation
- BLOOD-FLOW
- PROLONGED EXERCISE
- OXYGEN DELIVERY
- CARBON-DIOXIDE
- VENTILATORY RESPONSE
- INCREMENTAL EXERCISE
- MUSCLE TEMPERATURE
- HYPOXIC
- EXERCISE
- BODY-TEMPERATURE
- MAXIMAL EXERCISE
- Sport Sciences
Publication and Content Type
- ref (subject category)
- art (subject category)
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