Measurement of Ventilatory Muscle Strength
The ventilatory muscle strength was determined by assessing maximum inspiratory pressure (Maximum Inspiratory Pressure (MIP)) using an analog manovacuometer (Indumed®, Brazil) in the preoperative period in both groups. The measurement was performed using the protocol evaluated by Neder et al.11, which uses a unidirectional valve coupled to the manovacuometer and a nozzle with a 1mm millimeter orifice. The participant was asked to perform a maximum exhalation up to the residual volume and then a maximum and slow inhalation until the total lung capacity. The measurements were repeated 3 times, with an interval of one minute between them, using the highest value reached, provided that this value was not the last10. This assessment was repeated at the time of hospital discharge.