Grazzi Giovanni, Mazzoni Gianni, Casoni Ilario, Uliari Simone, Collini Gabriella, Heide Larja van der, Conconi Francesco
Department of Biochemistry and Molecular Biology, Centro Studi Biomedici Applicati allo Sport, Università degli Studi di Ferrara, Ferrara, Italy.
J Strength Cond Res. 2008 Jul;22(4):1116-23. doi: 10.1519/JSC.0b013e318173936c.
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.
本研究的目的是比较递增式骑行中工作率（WR）- 摄氧量（Vo2）和WR - 心率（HR）关系的模式，确定与心率转折点（HRdef）同时出现的摄氧量转折点（Vo2def）的发生情况，并确定如果存在Vo2def，它是否与通气无氧阈（VT）一致。24名职业自行车运动员在风阻自行车测力计上进行了最大递增测试。记录工作率、HR、Vo2和二氧化碳排出量（Vco2）。所获得的WR - Vo2关系在次最大工作率之前呈线性，之后呈曲线，因此描述了一个Vo2def。通过数学方法确定了所有受试者在Vo2def时的WR和Vo2。直至Vo2def时的DeltaWR.DeltaVo2比值显著低于Vo2def以上的比值（90±11 W·L·min对133±35 W·L·min，p < 0.0001）。所获得的WR - HR关系在次最大工作率之前呈线性，之后呈曲线。通过数学方法确定了所有受试者在HRdef时的WR和HR。Vo2def和HRdef时的WR值（329±32 W和326±34 W）显著相关（R = 0.96，p < 0.0001）且一致性良好（一致性界限为 - 4.7%至3.2%，Bland - Altman分析）。然后确定了所有受试者在VT时的Vo2。Vo2def和VT时的Vo2值显著相关（R = 0.99，p < 0.0001）且一致性很强（一致性界限为 - 1.9%至1.0%，Bland - Altman分析）。总之，显示出与HRdef和VT一致的Vo2def。这证实了确定WR - HR关系和HRdef是识别无氧阈的一种实用且非侵入性的方法。
