Ventilation and blood lactate increase exponentially during incremental exercise
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1992
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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BLOOD; LACTATE; ANAEROBIC-THRESHOLD; RESPIRATION; ACIDOSIS; CYCLING; ELITE-ATHLETE
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-366-327
(Last edited on
2002/02/27 18:45:01 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
This study examined whether the ventilatory (V) compensation for metabolic acidosis with increasing O2 uptake (VO2) and CO2 output (VCO2) might be more in accord with the theoretical expectation of a progressive acceleration of proton production from carbohydrate oxidation rather than a sudden onset of blood lactate (BLa) accumulation. The interrelationships between V, VO2, VCO2 and BLa concentration, (BLa), were investigated in 10 endurance-trained male cyclists during incremental (120 plus/minus 15 W min-1) exercise tests to exhaustion. Regression analyses on the V, VCO2 and (BLa) vs VO2 data revealed that all were better fitted by continuous Y=A.exp.(B.VO2) plus C rate laws than by threshold linear rate equations. Plots of V vs VCO2 and (BLa) were also non-linear. Ventilation increased as an exponential V=27 plus/minus 4.exp.(0.37 plus/minus 0.03).VCO2) function of VCO2 and as a hyperbolic function of (BLa). In opposition to the 'anaerobic (lactate) threshold' hypothesis, we suggest these data are more readily explained by a continuous development of acidosis, rather than a sudden onset of BLa accumulation, during progressive exercise.
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STATISTICS
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