Changes Related to Fatigue in Cardiorespiratory Response Sensitivity to Hypoxic and Hypercapnic Stimulation during Strenuous Physical Load

• Authors: Viktor Mishchenko , Andrzej Suchanowski , Olena Lysenko
• Languages of publication: EN

Abstracts

EN

Background: The aim was to study changes in the sensitivity of CRS responses of skilled athletes caused by fatigue during a strenuous physical load.Material/Methods: Response sensitivity to hypoxic and hypercapnic stimuli was analyzed in a group of high performance rowers (n=12) aged 18-22 years during exercising on "Concept-II" rowing ergometer. Two types of loads were used: sustained intensive load at high oxygen consumption (78-83% of VO2max) and relatively easier load (49-62% of VO2max) performed within 5 minutes. The method of rebreathing was used to determine responses sensitivity to CO2.Results: The results showed an increase in respiratory response sensitivity to hypoxia and a decrease in sensitivity to acidosis stimulus of respiration (CO2-H+) at the end of a strenuous load in presence of fatigue. Ventilatory response to hypoxic stimulus increased reliably before the end of work. At high intensity of loads during increment hypercapnia even in highly trained athletes the inhibition of ventilatory response has been notedConclusions: The data provide additional grounds for correction of fatigue by means of regulating the character and the intensity of physical loads in the process of endurance training. It has been shown that changes in sensitivity of CRS responses and other aspects of reactive features are of importance for special work capacity manifestations.

Keywords

EN

fatigue; cardiorespiratory response; hypoxia; hypercapnia; training load

• Publisher: Versita
• Journal: Baltic Journal of Health and Physical Activity
• Year: 2009
• Volume: 1
• Issue: 1
• Pages: 27-32

Dates

published

1 - 1 - 2009

online

3 - 11 - 2009

Contributors

author

Viktor Mishchenko

• Jedrzej Sniadecki Academy Physical Education and Sport, Gdansk, Poland

author

Andrzej Suchanowski

• Jedrzej Sniadecki Academy Physical Education and Sport, Gdansk, Poland

author

Olena Lysenko

• National University of Physical Education, Kiev, Ukraine

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Identifiers

DOI

10.2478/v10131-009-0003-z