Response of end tidal CO₂ pressure to impulse exercise

Yano, T. and Afroundeh, R. and Yamanak, R. and Arimitsu, T. and Lian, C. and Shirkawa, K. and Yunoki, T. (2014) Response of end tidal CO₂ pressure to impulse exercise. Acta Physiologica Hungarica, 101 (1). pp. 103-111. ISSN 0231-424X

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Abstract

The purpose of the present study was to examine how end tidal CO₂ pressure (PETCO₂) is controlled in impulse exercise. After pre-exercise at 25 watts for 5 min, impulse exercise for 10 sec with 200 watts followed by post exercise at 25 watts was performed. Ventilation (V̇E) significantly increased until the end of impulse exercise and significantly re-increased after a sudden decrease. Heart rate (HR) significantly increased until the end of impulse exercise and then decreased to the pre-exercise level. PETCO₂ remained constant during impulse exercise. PETCO₂ significantly increased momentarily after impulse exercise and then significantly decreased to the pre-exercise level. PETCO₂ showed oscillation. The average peak frequency of power spectral density in PETCO₂ appeared at 0.0078 Hz. Cross correlations were obtained after impulse exercise. The peak cross correlations between V̇E and PETCO₂, HR and PETCO₂, and V̇E and HR were 0.834 with a time delay of −7 sec, 0.813 with a time delay of 7 sec and 0.701 with a time delay of −15 sec, respectively. We demonstrated that PETCO₂ homeodynamics was interactively maintained by PETCO₂ itself, CO₂ transportation (product of cardiac output and mixed venous CO₂ content) into the lungs by heart pumping and CO₂ elimination by ventilation, and it oscillates as a result of their interactions.

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