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Reproducibility of aerobic and anaerobic thresholds in 20 to 50 year old men



Reproducibility of aerobic and anaerobic thresholds in 20 to 50 year old men



European Journal of Applied Physiology & Occupational Physiology 53(3): 260-266



The reproducibility of the aerobic (AerT) and the anaerobic (AnT) threshold was studied in 33 men aged 20-50 yr. They completed 2 maximal exercise tests on a bicycle ergometer. The thresholds, as .ovrhdot.VO2 [maximal O2 uptake] (l .cntdot. min-1), were determined visually by 2 investigators using both the blood lactate and the respiratory indices. The respiratory variables were measured with a computerized breath-by-breath method; samples of venous blood were drawn every 2nd min and analyzed enzymatically for lactate. The reproducibility of the AerT (r = 0.94) and of the AnT (r = 0.96) were equally good. The AnT can be determined either from blood lactate concentrations (AnTLa) or from ventilatory and gas exchange response (AnTr) during a 2-min incremental exercise test. They both also showed similar reproducibility: r = 0.93 for the AnTLa and r = 0.95 for the AnTr. The work rate and the measured physiological variables at the AerT and AnT, except for the blood lactate concentration, were very reproducible. Age did not affect the reproducibility of the thresholds. The poor reproducibility of blood lactate concentration of the AnT confirmed a previous opinion that the fixed blood lactate levels of 2 and 4 mmol .cntdot. l-1 are poor indicators of AerT and AnT.

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Accession: 006315132

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PMID: 6542860


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