The purpose of the present study was to examine how end tidal CO 2 pressure (PETCO 2 ) 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 (V . E) 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.PETCO 2 remained constant during impulse exercise. PETCO 2 significantly increased momentarily after impulse exercise and then significantly decreased to the pre-exercise level. PETCO 2 showed oscillation. The average peak frequency of power spectral density in PETCO 2 appeared at 0.0078 Hz. Cross correlations were obtained after impulse exercise. The peak cross correlations between V . E and PETCO 2 , HR and PETCO 2 , and V . E 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 PETCO 2 homeodynamics is interactively maintained by PETCO 2 itself, CO 2 transportation (product of cardiac output and mixed venous CO 2 content) into the lungs by heart pumping and CO 2 elimination by ventilation, and oscillates as a result of their interactions.
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