Int J Sports Med 2000; 21(6): 419-423
DOI: 10.1055/s-2000-3836
Physiology and Biochemistry
Georg Thieme Verlag Stuttgart · New York

Increase Characteristics of the Cumulated Excess-CO2 and the Lactate Concentration During Exercise

K. Roecker,  F. Mayer,  H. Striegel,  H.-H. Dickhuth
  • Med. Clinic and Policlinic, University of Tuebingen, Dept. of Sports Medicine, Tuebingen, Germany
Further Information

Publication History

Publication Date:
31 December 2000 (online)

The so-called excess-CO2 in physical exertion results stoichiometrically directly from the quantity of protons bound in bicarbonate buffering. This situation is used in determining the ventilatory threshold (VT). However, the extent to which the degree and increase characteristics of excess-CO2 can be used as an equivalent to blood lactate concentrations is uncertain. To investigate this relationship, 21 healthy men exercised on a cycle ergometer (starting at 50 watt, increases of 50 watt every 3 minutes) to subjective exhaustion. To evaluate the characteristics of this increase, a slope constant λ was calculated in relation to performance for both the blood lactate concentration (λ lactate) and the cumulated excess-CO2 (λ CO2excess). The start of the lactate increase (LT) and excess-CO2 (VT) showed good intercorrelation (VT = 2.27 + 0.98 · LT; r = 0.914; P < 0.001). Mean λ lactate and λ CO2 excess were of similar dimensions in all subjects (69.3 ± 39.8 watt vs. 80.11 ± 15.7 watt), but a minority of the subjects (n = 7) showed a considerably more gradual increase for the excess-CO2 to the maximum. Since in addition there was no significant correlation between the absolute values for maximum lactate concentrations and the cumulative excess-CO2, an interindividual prediction of lactate concentrations from the excess-CO2 would be difficult. It is an open question, however, whether perhaps additional performance-limiting factors, such as the ventilation or the buffering capacity, may be included when measuring the excess-CO2 so that this parameter could be more a measure for the formation rate of new lactate than the blood lactate concentration alone.


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