Identification of a JOURNAL/jscr/04.03/00124278-200807000-00013/OV0312_4/v/2021-02-09T093601Z/r/image-png o2 Deflection Point Coinciding With the Heart Rate Deflection Point and Ventilatory Threshold in Cycling

Abstract

The purposes of this study were to compare the patterns of the work rate (WR)-Vo2 and WR-heart rate (HR) relationships in incremental cycling, to ascertain the occurrence of a Vo2 deflection (Vo2def) coinciding with the HR deflection point (HRdef ), and to determine whether the Vo2def, if present, coincides with the ventilatory anaerobic threshold (VT). Twenty-four professional cyclists performed a maximal incremental test on a wind-load cycle ergometer. Work rate, HR, Vo2, and Vco2 were recorded. The WR-Vo2 relationships obtained were linear up to submaximal WR and curvilinear thereafter and thus described a Vo2def. The WR and Vo2 at Vo2def were mathematically determined for all subjects. The ratio of DeltaWR.DeltaVo2 up to Vo2def was significantly lower than that above Vo2def (90 +/- 11 W.L.min versus 133 +/- 35 W.L.min, p < 0.0001). The WR-HR relationships obtained were linear up to submaximal WR and curvilinear thereafter. The WR and HR at HRdef were mathematically determined for all subjects. The WR values at Vo2def and at HRdef (329 +/- 32 W and 326 +/- 34 W) were significantly correlated (R = 0.96, p < 0.0001) and in good concordance (limits of agreement from -4.7% to 3.2%, Bland-Altman analysis). The Vo2 at VT was then determined for all subjects. The Vo2 values at Vo2def and at VT were significantly correlated (R = 0.99, p < 0.0001) and in strong concordance (limits of agreement from -1.9% to 1.0%, Bland-Altman analysis). In conclusion, a Vo2def coinciding with HRdef and VT was shown. This confirms that the determination of the WR-HR relationship and of HRdef is a practical and noninvasive means of identifying anaerobic threshold.

Respostas cardiorrespiratórias máximas e no limiar anaeróbio da corrida em piscina funda

“…Several studies in the literature have demonstrated the application of the HRDP to determine the AT in different land-based exercise modalities [10][11][12]15,[25][26][27] . However, in the aquatic environment there are, currently, few studies available.…”

“…Also on a treadmill, Sentija et al 11 concluded that a ramp protocol can be used to determine the HRDP in trained runners. In incremental cycling, strong correlations were found between the AT, as determined by the HRDP, and the blood lactate response 12 . Mikulic et al 13 compared physiological variables and performance on a rowing ergometer between two methods of determining the AT (HRDP and VM) and found a close relationship.…”

Oxygen Uptake Attenuation at Ventilatory Threshold in Men With Coronary Artery Disease

“…A city bike was mounted on a wind-load simulator equipped with a crank set with a built-in power measuring system (SRM Training System, Jülich-Welldorf, Germany). 5 Bicycle gearing was individualized according to the functional capacity of the individual; the mean distance covered in 1 rpm was 5.49 ± 0.4 m.…”

A new approach for the determination of anaerobic threshold: methodological survey on the modified Dmax method

“…The evaluation of AT through the measurement of blood lactate transition thresholds is commonly performed in sports science assessment and prescription of the optimal training intensities (Fell, 2008;Grazzi et al, 2008;Wonisch et al, 2002).…”