[en] The method described by Wasserman for anaerobic threshold (AT) determination, based on the recording of ventilatory parameters, was supported by the simultaneous appearance of hyperlactacidemia and hyperventilation during a standardized incremental work test. Our study aimed at testing the AT in another profile of exercise, viz., during exercises at constant workloads. A homogenous population of 66 healthy subjects performed on a treadmill a total of 100 exercises of 20 min duration at constant workloads (43, 48, 52, 57, 63, and 71% VO2 max). The VO2, V, and venous plasma lactic acid (LA) were determined every minute. LA showed an initial transient increase at 43% VO2 max and a steady-state elevated level above 48% VO2 max. In contrast, the hyperventilation threshold (HVT) was only observed above 57% VO2 max, simultaneously with a delayed steady-state VO2 and with a sustained increase of lactate until the end of exercise. The meaning of the simultaneity of these three events must still be studied. However, the dissociation between both early and steady-state lactate thresholds and HVT is not in keeping with the concept of AT. In these conditions, there is no evidence that HVT necessarily represents an AT, viz., a critical intensity of exercise inducing an insufficient oxygen delivery to the muscles. This conclusion does not imply that the measurement of HVT should be rejected as an empirical test of physical fitness.
Disciplines :
Endocrinology, metabolism & nutrition
Author, co-author :
Scheen, André ; Université de Liège - ULiège > Département des sciences cliniques > Diabétologie, nutrition et maladie métaboliques - Médecine interne générale
Juchmes, J.
Cession-Fossion, A.
Language :
English
Title :
Critical analysis of the "anaerobic threshold" during exercise at constant workloads.
Publication date :
1981
Journal title :
European Journal of Applied Physiology and Occupational Physiology
Asmussen E., Nielsen M. (1946) Studies on the regulation of respiration in heavy work. Acta Physiologica Scandinavica 12:171-188.
Bang O. (1936) The lactate content of the blood during and after muscular exercise in man. Scand Arch Physiol 74:49-82.
Dempsey J.A., Gledhill N., Reddan W.G., Forster H.V., Hanson P.G., Claremont A.D. (1977) Pulmonary adaptation to exercise: effects of exercise type and duration, chronic hypoxia, and physical training. Ann NY Acad Sci 301:243-261.
Fletcher W.M., Hopkins F.G. (1907) Lactic acid in amphibian muscle. The Journal of Physiology 35:247-309.
Gimenez M., Hennequin R., Horsky P., Colas, Saunier C. (1974) Evolution de la lactacidémie, de l'équilibre acido-basique électrolytique au cours d'un exercise musculaire rectangulaire de 20 minutes chez l'homme à différentes charges et à la “puissance maximale supportée”. Bull Physio-Pathol Resp 10:463-479.
Graham T., Sjogaard G., Lollgen H., Saltin B. (1978) NAD in muscle of man at rest and during exercise. Pflügers Arch 376:35-39.
Hermansen L., Stensvold I. (1972) Production and removal of lactate during exercise in man. Acta Physiol Scand 86:191-201.
Jones N.L. (1980) Hydrogen ion balance during exercise. Clin Sci 59:85-91.
Lundholm L., Mohme-Lundholm E., Vamos N. (1963) Lactic acid assay with L (+) lactic dehydrogenase from rabbit muscle. Acta Physiol Scand 58:243-249.
Lundin G., Strom G. (1947) The concentration of blood lactic acid in man during muscular work in relation to the partial pressure of oxygen of the inspired air. Acta Physiologica Scandinavica 13:253-266.
Margaria R., Edwards H.T., Dill D.E. (1933) The possible mechanisms of contracting and paying the oxygen debt and the role of lactic acid in muscular contraction. Am J Physiol 106:689-715.
Margaria R., Meschia G., Marro F. (1954) Determination of O2 consumption with Pauling oxygen meter. J Appl Physiol 6:776-780.
Owles W.H. (1930) Alterations in the lactic acid content of the blood as a result of light exercise and associated changes in the CO2 combining power of the blood and in the alveolar CO2 pressure. The Journal of Physiology 69:214-237.
Pendergast D., Cerretelli P., Rennie D.W. (1979) Aerobic and glycolytic metabolism in arm exercise. J Appl Physiol 47:754-760.
Pirnay F., Petit J.M., Bottin R., Deroanne R., Juchmes J., Belge O. (1966) Comparaison de deux méthodes de mesure de la consommation maximum d'oxygène. Int Z Angew Physiol 23:203-211.
Snedecor G.W. Statistical methods, 5th edition, Iowa State University Press, Ames; 1966.
Wasserman K., Whipp B.J., Koyal S.N., Beaver W.L. (1973) Anaerobic threshold and respiratory gas exchange during exercise. J Appl Physiol 35:236-243.
Wasserman K., Whipp B.J. (1975) Exercise physiology in health and disease. Am Rev Resp Dis 112:219-249.
Wasserman K. (1978) Breathing during exercise. New EngL J Med 298:780-785.
Whipp B.J., Wasserman K. (1972) Oxygen uptake kinetics for various intensities of constant load work. J Appl Physiol 33:351-356.