Giovanni Grazzi, Gianni Mazzoni, Ilario Casoni, Simone Uliari, Gabriella Collini, Larja van der Heide, Francesco Conconi
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
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