Vagal threshold determination during incremental stepwise exercise in normoxia and normobaric hypoxia
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15510%2F20%3A73602986" target="_blank" >RIV/61989592:15510/20:73602986 - isvavai.cz</a>
Result on the web
<a href="https://www.mdpi.com/1660-4601/17/20/7579" target="_blank" >https://www.mdpi.com/1660-4601/17/20/7579</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/ijerph17207579" target="_blank" >10.3390/ijerph17207579</a>
Alternative languages
Result language
angličtina
Original language name
Vagal threshold determination during incremental stepwise exercise in normoxia and normobaric hypoxia
Original language description
This study focuses on the determination of the vagal threshold (Tva) during exercise with increasing intensity in normoxia and normobaric hypoxia. The experimental protocol was performed by 28 healthy men aged 20 to 30 years. It included three stages of exercise on a bicycle ergometer with a fraction of inspired oxygen (FiO2) 20.9% (normoxia), 17.3% (simulated altitude ~1500 m), and 15.3% (~2500 m) at intensity associated with 20% to 70% of the maximal heart rate reserve (MHRR) set in normoxia. Tva level in normoxia was determined at exercise intensity corresponding with (M; SD) 45.0 %; 5.6% of MHRR. Power output at Tva (POth), representing threshold exercise intensity, decreased with increasing degree of hypoxia (normoxia: 114 W; 29 W; FiO2 = 17.3%: 110 W; 27 W; FiO2 = 15.3%: 96 W; 32 W). Significant changes in POth were observed with FiO2 = 15.3% compared to normoxia (p = 0.007) and FiO2 = 17.3% (p = 0.001). Consequentially, normoxic %MHRR adjusted for hypoxia with FiO2 = 15.3% was reduced to 39.9; 5.5%. Considering the convenient altitude for exercise in hypoxia, POth did not differ excessively between normoxic conditions and the simulated altitude of ~1500 m, while more substantial decline of POth occurred at the simulated altitude of ~2500 m compared to the other two conditions.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
30306 - Sport and fitness sciences
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Environmental Research and Public Health
ISSN
1661-7827
e-ISSN
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Volume of the periodical
2020
Issue of the periodical within the volume
17
Country of publishing house
CH - SWITZERLAND
Number of pages
12
Pages from-to
1-12
UT code for WoS article
000585596300001
EID of the result in the Scopus database
2-s2.0-85093844981