The goal of this clinical trial is to prove the benefit of intrapulmonary percussive ventilator in healthy volunteers. The main questions are: * How can intrapulmonary percussive improve lung function？ * What is the subjective feeling through intrapulmonary percussive? Participants will be undergoing treatment of intrapulmonary percussive. Then they will be assessed for lung function and EIT before and after intrapulmonary percussive.
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Pulmonary function test
Timeframe: through study completion, an average one hour
Electrical Impedance Tomography of Pulmonary(EIT)
Timeframe: through study completion, an average one hour