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Excess CO(2) output response during and after short-term intensive exercise in sprinters and long-distance runners



Excess CO(2) output response during and after short-term intensive exercise in sprinters and long-distance runners



Japanese Journal of Physiology 50(2): 199-205



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

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Accession: 010628668

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PMID: 10880876


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