Applicability of standardized ventilatory measure scores in determining anaerobic threshold
S. Nejkov, L. Stefanov
Abstract: The aim of the present study is to compare the compatibility between the Z-score method for determining the second anaerobic threshold and the Dmax method for determining the second lactate threshold.
Ten competitors from the National Rowing Team of the Republic of Bulgaria, men, with an average age of 18 years, were studied during spiroergometric, graded incremental exercise test to exhaustion. Ventilatory parameters, intensity and heart rate were recorded bred-by-bred for each subject for each step of the test. We determined the second lactate threshold using the Z-score method applied to the ventilatory measurements of the competitors. As a reference method for determining the second lactate threshold, we used the Dmax method.
In both approaches for determining the anaerobic threshold, values for heart rate are the same, and the mean values are near at p-value = 0.563 (α=0.05). The coefficients of variation show great uniformity for the two samples. The dispersion for both samples is similar, indicating that the two approaches give near results for heart rate at the anaerobic threshold determined by the two methods. The Bland&Altman scatterplot clearly shows that the difference between the measurements from the two compared methods is within the 95% confidence interval.
Series on Biomechanics, Vol.37, No.1 (2023), 31-35
DOI: 10.7546/SB.05.01.2023
Ten competitors from the National Rowing Team of the Republic of Bulgaria, men, with an average age of 18 years, were studied during spiroergometric, graded incremental exercise test to exhaustion. Ventilatory parameters, intensity and heart rate were recorded bred-by-bred for each subject for each step of the test. We determined the second lactate threshold using the Z-score method applied to the ventilatory measurements of the competitors. As a reference method for determining the second lactate threshold, we used the Dmax method.
In both approaches for determining the anaerobic threshold, values for heart rate are the same, and the mean values are near at p-value = 0.563 (α=0.05). The coefficients of variation show great uniformity for the two samples. The dispersion for both samples is similar, indicating that the two approaches give near results for heart rate at the anaerobic threshold determined by the two methods. The Bland&Altman scatterplot clearly shows that the difference between the measurements from the two compared methods is within the 95% confidence interval.
Series on Biomechanics, Vol.37, No.1 (2023), 31-35
DOI: 10.7546/SB.05.01.2023
Keywords: anaerobic threshold; Dmax method; Z-score
Date published: 2023-02-02
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