Determination of Anaerobic Threshold by a new approach through the incremental exercise using proportion in HR and Ve changes in rowers

Stefanov, Lachezar G.; Neykov, Svilen

doi:10.15561/26649837.2021.0203

Cited by 4 publications

(5 citation statements)

References 24 publications

(35 reference statements)

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“…AnT was determined according to the X-method described recently (Stefanov, 2021). The method uses the intersection point between the curve reflecting the difference (Diff) and the curve reflecting %V E (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

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Correlation Between Control Test Times Related to the Anaerobic Threshold Determined by the X-Method in Rowers

Stefanov¹,

Neykov²,

Mladenov³

2022

Proceeding Book Vol.1

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Aim: The aim of the study is to investigate the correlation between the times for overcoming the distance of 2000 m achieved in control tests on the water and the anaerobic threshold determined by the X-method in laboratory conditions. Material and Methods: Includes collection and analysis of the times achieved in overcoming the distance of 2000 m and the anaerobic threshold determined by the X-method, related to the individual ergometric power and heart rate for each participant. Five elite rowers from the National Team of Bulgaria, men, for the period from 2018 to 2021 were examined. To determine the anaerobic threshold by the X-method, we used the data from minute pulmonary ventilation and heart rate recorded every 20 s during the maximum spiroergometric test with increasing intensity. The test was performed on a Concept II rowing machine and equipment measuring pulmonary ventilation and heart rate. Results: The Pearson coefficient r = .457 ( = .05) shows a moderate correlation between the times for overcoming the distance of 2000 m, and the heart rate recorded at the anaerobic threshold determined by the X-method. Conclusion: The X-method for determining the anaerobic threshold is an relevant method in the control of the training process and has prognostic value in determining the functional status of rowers. An advantage is the significantly lower cost of the used diagnostic equipment compared to the cost of a conventional gas analyzer.

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Section: Methodsmentioning

confidence: 99%

“…Recently, the X-method (Stefanov, 2021) for the determination of AnT was published, which is non-invasive, accurate and relatively easy to apply in rowers, compared to other reference methods (Stefanov, 2022).…”

Section: Introductionmentioning

confidence: 99%

Correlation Between Control Test Times Related to the Anaerobic Threshold Determined by the X-Method in Rowers

Stefanov¹,

Neykov²,

Mladenov³

2022

Proceeding Book Vol.1

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“…Hypothesis: After proving in a previous study [22] that there is a 95% of agreement between HR at AnT determined by the X-method, the modified D max method and at fixed blood lactate concentration of 4 mmol/L, we assumed that a similar agreement there should be between X-method and VT2 determined by RCP.…”

Section: Original Articlementioning

confidence: 96%

“…The determination of AnT by a method recently described by us [22] was compared with the AnT determined by two reference methods using blood lactate concentration. The method uses the intersection between difference (Diff) between the percentages of the %HR versus HR peak and the %Ve versus Ve peak on the one hand and the %Ve on the other to determine AnT.…”

Section: Original Articlementioning

confidence: 99%

Comparison between determination of second anaerobic threshold by respiratory compensating point and X-method in rowers

Stefanov¹

2022

ppcs

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Background and Study Aim. The aim of this study is to verify the X-method for determining the second anaerobic threshold in rowers.Material and Methods. Twelve male athletes from the national rowing team of Bulgaria were tested. Participants performed a one-time graded incremental exercise test to exhaustion on a rowing ergometer. The workload were conducted on rowing ergometer system Concept 2, and spirometry system Clark C5. We obtained ventilatory indices, intensity and heart rate bred-by-bred for each participant, for each test stage. The anaerobic threshold was determined by two methods: 1) by the localization of the respiratory compensation point visually, after polynomial regression analysis of the trends for the dynamics of the ventilatory variables related to time and 2) by the X-method using the change in the ratio between heart rate and pulmonary ventilation. We compared the heart rate corresponding to the anaerobic threshold determined by both methods.Results. We found similar values for heart rate at the respiratory compensation point and the anaerobic threshold determined by the X-method for each of the investigated. The Shapiro-Wilk test showed a normal distribution of the two samples with a significance level of α = 0.05. Thus, the t-test for two paired samples showed a p-value of 0.202 at α = 0.05. We found a correlation coefficient r = 0.973 between the heart rate at the anaerobic threshold (determined by X-method) and the heart rate at the anaerobic threshold (detected at the respiratory compensation point). The Blant-Altman analysis showed that 95% of the points in the scatter plot lie within the confidence interval.Conclusions. The two methods give similar results and can be applied alternatively in the investigation of rowers in the age group 18.3 ± 1.07 years. The X-method always gives a reliable intersection point, which in our studies is close to the second anaerobic threshold. Comparative studies are also needed in other contingents for the wider use of the X-method.

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“…Therefore, when VO 2max is evaluated through an IT on the rowing machine, along with obtaining the VTs, their mechanical equivalences are also observed ( Cerezuela-Espejo et al, 2018 ; Huerta Ojeda et al, 2022a ). In this sense, there have been several attempts to validate non-invasive and practical methods to help determine VTs ( Cabo, Martinez-Camblor & del Valle, 2011 ; Stefanov & Neykov, 2021 ). This background shows the importance of establishing different training zones based on ventilatory parameters ( López Chicharro, Vicente Campos & Cancino López, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Six-minute rowing test: a practical tool for training prescription, from ventilatory thresholds and power outputs, in amateur male rowers

Huerta Ojeda,

Riquelme Guerra

2023

PeerJ

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Background The 6-minute rowing ergometer test (6-minRT) is valid and reliable for establishing maximal aerobic power (MAP) in amateur male rowers. However, ventilatory thresholds (VTs) have not yet been established with their mechanical correspondence in this test. Objective The primary objective was to determine the VTs in the 6-minRT achieved by amateur male rowers, while the secondary objective was to determine the correspondence between ventilatory, mechanical, and heart rate (HR) outcomes of the 6-minRT. Methods Sixteen amateur male rowers were part of the study. All participants were instructed to perform an incremental test (IT) and a 6-minRT. Determination of the ventilatory parameters for the first ventilatory threshold (VT1), the second ventilatory threshold (VT2), and 6minRTVO2max were performed by correlating the outcomes of VT1, VT2, and VO2max obtained in the IT, with the outcomes of 6-minRT. For these purposes, Pearson’s test was used, with the following criteria: trivial, <0.1; small, 0.1–0.3; moderate, 0.3–0.5; high, 0.5–0.7; very high, 0.7–0.9; or practically perfect, >0.9. The significance level was p < 0.05. Results The IT analysis determined that VT1 and VT2 correspond to 55 and 80% of VO2max, respectively. A high correlation was observed between IT outcomes in VT1, VT2, and VO2max, with the outcomes of 6-minRT (r > 0.6). Conclusion Based on IT ventilatory parameters and concordance analysis, VT1 and VT2 of 6-minRT are determined at 55 and 80%, respectively, of both ventilatory parameters and their corresponding mechanical outcomes and HR.

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Determination of Anaerobic Threshold by a new approach through the incremental exercise using proportion in HR and Ve changes in rowers

Cited by 4 publications

References 24 publications

Correlation Between Control Test Times Related to the Anaerobic Threshold Determined by the X-Method in Rowers

Correlation Between Control Test Times Related to the Anaerobic Threshold Determined by the X-Method in Rowers

Comparison between determination of second anaerobic threshold by respiratory compensating point and X-method in rowers

Six-minute rowing test: a practical tool for training prescription, from ventilatory thresholds and power outputs, in amateur male rowers

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