Excess CO2 Output Response during and after Short-Term Intensive Exercise in Sprinters and Long-Distance Runners.

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The purpose of the present study was to examine the response of excess CO2 output to short-term intensive exercise in sprinters (SPR) and long-distance runners (LDR). End-tidal CO2 pressure (PETCO2) increased up to about 20 s postexercise and then returned to the resting level at about 2–3 min postexercise. Thereafter, PETCO2 remained below the resting level. V˙CO2 excess, defined as the difference between V˙CO2 and V˙O2 was integrated from the start of exercise until PETCO2 returned to the resting level. This integrated V˙CO2 excess was defined as the first phase of CO2 excess (1st CO2 excess). The subsequent integrated V˙CO2 excess until 10 min postexercise was defined as the second phase of CO2 excess (2nd CO2 excess). The ratio of 1st CO2 excess to the lactate rise from rest to the peak value was significantly lower in SPR than in LDR, whereas 2nd CO2 excess was significantly greater in SPR than in LDR. The decrease in PETCO2 at 10 min postexercise was significantly larger in SPR than in LDR. The 2nd CO2 excess was closely related to the decrease in PETCO2. The results in the second phase suggest that the difference in the response of excess CO2 output is derived from the difference in the respiratory chemosensitivity to lactic acid rise.<br>

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