Babb T G, Rodarte J R
Department of Medicine, Baylor College of Medicine, Houston, Texas.
J Appl Physiol (1985). 1993 Apr;74(4):2016-22. doi: 10.1152/jappl.1993.74.4.2016.
There is presently no precise way to determine ventilatory capacity for a given individual during exercise; however, this information would be helpful in evaluating ventilatory reserve during exercise. Using schematic representations of maximal expiratory flow-volume curves and individual maximal expiratory flow-volume curves from four subjects, we describe a technique for estimating ventilatory capacity. In these subjects, we measured maximal expiratory flow-volume loops at rest and tidal flow-volume loops and inspiratory capacity (IC) during submaximal cycle ergometry. We also compared minute ventilation (VE) during submaximal exercise with calculated ventilatory maxima (VEmaxCal) and with maximal voluntary ventilation (MVV) to estimate ventilatory reserve. Using the schematic flow-volume curves, we demonstrated the theoretical effect of maximal expiratory flow and lung volume on ventilatory capacity and breathing pattern. In the subjects, we observed that the estimation of ventilatory reserve with use of VE/VEmaxCal was most helpful in indicating when subjects were approaching maximal expiratory flow over a large portion of tidal volume, especially at submaximal exercise levels where VE/VEmaxCal and VE/MVV differed the most. These data suggest that this technique may be useful in estimating ventilatory capacity, which could then be used to evaluate ventilatory reserve during exercise.
目前尚无精确方法可在运动期间确定特定个体的通气能力；然而，该信息对于评估运动期间的通气储备会有所帮助。利用四名受试者的最大呼气流量-容积曲线示意图和个体最大呼气流量-容积曲线，我们描述了一种估算通气能力的技术。在这些受试者中，我们测量了静息时的最大呼气流量-容积环以及次极量运动试验期间的潮气量-容积环和吸气容量（IC）。我们还将次极量运动期间的分钟通气量（VE）与计算得出的通气最大值（VEmaxCal）以及最大自主通气量（MVV）进行比较，以估算通气储备。利用示意性的流量-容积曲线，我们展示了最大呼气流量和肺容积对通气能力及呼吸模式的理论影响。在这些受试者中，我们观察到，使用VE/VEmaxCal估算通气储备对于指示受试者在潮气量的大部分范围内何时接近最大呼气流量最为有用，尤其是在次极量运动水平下，此时VE/VEmaxCal与VE/MVV的差异最大。这些数据表明，该技术可能有助于估算通气能力，进而可用于评估运动期间的通气储备。
