Key result
Expired excess CO2 volume correlates with blood lactate but cannot accurately predict it across individuals.
Why the study?
The relationship between expired non-metabolic CO2 and blood lactate accumulation, particularly in relation to ventilatory and lactate thresholds, was not well characterized in elite cyclists.
Population
21 elite cyclists (15 males, 6 females)
Comparison
Expired excess CO2, VE/VO2, and blood lactate threshold values
Design
Observational study with progressive intensity bicycle ergometer test
Authors
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ExCO2 cannot replace blood lactate monitoring due to individual/gender variations; leaves open refined noninvasive prediction in prospective exercise studies.
Observational (n=21)
Effect estimate: r = 0.69
p-value: p=<0.001
Although changes in expired excess CO2 precede and track changes in blood lactate concentration during progressive exercise, individual and gender variations prevent accurate prediction of blood lactate from exCO2.
Anderson et al. (1991) conducted an observational in Healthy elite cyclists (n=21). Expired non-metabolic CO2 (exCO2) vs. Blood lactate accumulation was evaluated on Correlation between expired excess CO2 volume and blood lactate concentration (r = 0.69, p=<0.001). Expired excess CO2 volume correlates significantly with blood lactate concentration (r=0.69, P<0.001), but cannot accurately predict it due to individual and gender variations.
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