Determination of anaerobic threshold based on the dynamics of the heart and stroke rates estimated in the upper body progressive test D Sitkowski, J Starczewska-Czapowska, K Burkhard-Jagodzińska Biol Sport 2004; 21(4):337-350 ICID: 891738
Article type: Original article
IC™ Value: 10.26
Abstract provided by Publisher
In an incremental exercise the heart (HR) and stroke (SR) rates can be periodically synchronized suggesting that changes in the course of a relationship between power output (PO) and HR, recorded in the Conconi test as the deflection point (DP), may be related to changes in SR. In view of this, the aim of the present study was to analyse the course of the PO/HR, PO/SR, and SR/HR relationships in the progressive incremental exercise as well as to evaluate the accuracy of determination of anaerobic threshold (AT) based on the above three relationships. In the investigation, 12 kayakers performed the following tests on a special ergometer: the Conconi test (CT), the 30-min test (PET) with power output at DP (PODP), the critical power test (CP), and the graded exercise test until exhaustion (GT), in which power output at the anaerobic threshold (POAT4, PODmax) was determined based on the blood lactate level (LA). The lack of DP in the PO/HR and the PO/SR relationships was detected in two and one athlete, respectively. In contrast, in the SR/HR relationship DP was recorded in all the tested subjects. The times of occurrence of DP did not significantly differ. Although, as judged by the LA dynamics in PET, the intensity of exercising exceeded that at the maximal lactate steady state (MLSS), all the athletes managed to complete the test. No significant differences were detected between PODP and POAT4, PODmax or CP, and the agreement of the results obtained in CT with those collected in CP and GT was similar to that determined within each of the tests. The obtained results suggest that the changes in the course of the PO/HR relationship may be associated with spontaneous changes of SR. The lack of diversity among the times of occurrence of DP in the three relationships tested allows for an easy and non-invasive determination of AT even in case of a linear PO/HR relationship. The power output estimated with use of the presented method is higher than that at MLSS, but it is sustainable for at least 30 min. The accuracy of determination of anaerobic threshold based on the analysis of the three DPs appears to be comparable with that obtained with use of AT4, Dmax, and CP.