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2009 | 1 | 2 | 97-104
Tytuł artykułu

Specifics of Ventilatory and Heart Rate Chemosensitivity Related to Special Endurance Capacity in High Performance Alpinists and Endurance Athletes

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Background: The aim was to compare ventilatory and heart rate chemosensitivity to hypoxia and hypercapnia in homogenous groups of high performance alpinists and endurance athletes and its relation to special work endurance.Material/Methods: Thirty-two male best national alpinists (30.7±2.7 yrs, VO2max 63.7±1.9 ml. kg-1,min-1, 14.3±2.4 yrs of experience) and 24 high performance male road cyclists of national team (25.7±1.1 yrs, VO2max 74.5±1.5 ml.kg-1,min-1, 11.2±1.4 yrs of experience) were examined by isocapnic progressive hypoxia and CO2 rebreathing tests. Maximal oxygen uptake, lung ventilation and heart rate peak responses were measured in an incremental ergometric test at sea level. Special work capacity of 23 alpinists was evaluated as the best time of non complicated mountain climbing between the point at 3,290 and 4,300 m above the sea level. Special work capacity of cyclists was evaluated as the best time of the individual 50 km race at the sea level.Results: The results showed no significant differences of the hypoxic ventilatory response in groups of alpinists and cyclists (p<0.05) But circulatory response evaluated by response of HR increase in answer to a decrease in O2 arterial blood saturation (SaO2) in alpinists was lower (p<0.05). Results showed that the evaluation of ventilatory and heart rate chemosensitivity in addition to measure of aerobic power may give important information for prevision of specific working capacity of high performance alpinists. Maximal oxygen uptake (ml/kg body mass) of the four best alpinists did not differ from the values of other alpinists. Special work capacity of alpinists was significantly related to tidal volume increase for the hypoxia test (r=-0.60) and to CO2 sensitivity (r=-0.67).Conclusions: The long-term exposure to environmental hypoxia and hypocapnia in alpinists generates specific changes in respiratory control. To evaluate special work capacity potential possibilities in a homogenous group of high performance alpinists first of all heart rate response sensitivity to hypoxia as well ventilatory response sensitivity to CO2 had to be taken into account, but only an alpinist's aerobic power.
Wydawca

Rocznik
Tom
1
Numer
2
Strony
97-104
Opis fizyczny
Daty
wydano
2009-01-01
online
2009-12-23
Twórcy
  • Jedrzej Sniadecki Academy of Physical Education and Sport, Gdansk, Poland
  • National University of Physical Education and Sport, Kiev, Ukraine
  • Jedrzej Sniadecki Academy of Physical Education and Sport, Gdansk, Poland
Bibliografia
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  • Chicharro JL, Hoyos J, Lucía A. Effects of endurance training on the isocapnic buffering and hypocapnic hyperventilation phases in professional-cyclists. Brit J Sports Med 2000; 34:450-455.[Crossref]
  • Ohyabu Y, Usami A, Ohyabu I, Ishida Y, Miyagawa C, Arai T, Honda Y. Ventilatory and heart rate chemosensitivity in track-and-field athletes. Eur J Appl Physiol Occup Physiol 1990;59(6):460-464.
  • Steinback CD, Salzer D, Medeiros PJ, Kowalchuk J, Shoemaker JK. Hypercapnic vs. hypoxic control of cardiovascular, cardiovagal, and sympathetic function. Am J Physiol Regul Integr Comp Physiol 2009;296(2):402-410.
  • Spyer KM, Dale N, Gourine AV. ATP is a key mediator of central and peripheral chemosensory transduction. Exp Physiol 2004 Jan;89(1):53-59.[PubMed]
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_v10131-009-0011-z
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