Fig. 2
Changes in the cardiopulmonary variables before and after BT. Changes in the ventilatory variables at pre-BT and at 3 months and 1 year after BT. Cardiopulmonary function was assessed by three procedures of incremental cardiopulmonary exercise testing using a similar treadmill protocol. BT bronchial thermoplasty, ex expiratory, fR breathing frequency, in inspiratory, Te expiratory time, Ti/Ttot the ratio of inspiratory time to total breathing cycle time, \( \dot{V}_{E} \) minute ventilation, \( \dot{V}_{{O_{2} }} \) oxygen uptake, VT tidal volume. Closed circle: pre-BT; open triangle: 3 months after BT; open circle: 1 year after BT