dentification of a [latin capital V with dot above]o2 Deflection Point Coinciding With the Heart Rate Deflection Point and Ventilatory Threshold in Cycling

• Autores: Giovanni Grazzi, Gianni Mazzoni, Ilario Casoni, Simone Uliari, Gabriella Collini, Larja van der Heide, Francesco Conconi
• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 22, Nº. 4, 2008, págs. 1116-1123
• Idioma: inglés
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• Resumen

  • Grazzi, G, Mazzoni, G, Casoni, I, Uliari, S, Collini, G, van der Heide, L, and Conconi, F. Identification of a [latin capital V with dot above]o2 deflection point coinciding with the heart rate deflection point and ventilatory threshold in cycling. J Strength Cond Res 22: 1116-1123, 2008-The purposes of this study were to compare the patterns of the work rate (WR)-[latin capital V with dot above]o2 and WR-heart rate (HR) relationships in incremental cycling, to ascertain the occurrence of a [latin capital V with dot above]o2 deflection ([latin capital V with dot above]o2def) coinciding with the HR deflection point (HRdef ), and to determine whether the [latin capital V with dot above]o2def, 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, [latin capital V with dot above]o2, and [latin capital V with dot above]co2 were recorded. The WR-[latin capital V with dot above]o2 relationships obtained were linear up to submaximal WR and curvilinear thereafter and thus described a [latin capital V with dot above]o2def. The WR and [latin capital V with dot above]o2 at [latin capital V with dot above]o2def were mathematically determined for all subjects. The ratio of [DELTA]WR[middle dot][DELTA][latin capital V with dot above]o2-1 up to [latin capital V with dot above]o2def was significantly lower than that above [latin capital V with dot above]o2def (90 +/- 11 W[middle dot]L-1[middle dot]min-1 versus 133 +/- 35 W[middle dot]L-1[middle dot]min-1, 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 [latin capital V with dot above]o2def and at HRdef (329 +/- 32 W and 326 +/- 34 W) were significantly correlated (R2 = 0.96, p < 0.0001) and in good concordance (limits of agreement from -4.7% to 3.2%, Bland-Altman analysis). The [latin capital V with dot above]o2 at VT was then determined for all subjects. The [latin capital V with dot above]o2 values at [latin capital V with dot above]o2def and at VT were significantly correlated (R2 = 0.99, p < 0.0001) and in strong concordance (limits of agreement from -1.9% to 1.0%, Bland-Altman analysis). In conclusion, a [latin capital V with dot above]o2def 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