This is a useful link to a paper comparing the Shaker, Acapella and Flutter devices. Here are other research papers that use and/or reference the Shaker. They are mostly from Brazil (and in Portuguese but the abstracts are in English) because this is where the product originates from: Mechanical Behaviors of Flutter VRP1, Shaker, and Acapella Devices Mechanical comparison of 6 oscillatory positive expiratory pressure devices Utilization of a High Frequency Oral Oscillatory Device with Mechanical Ventilation Respiratory physiotherapy in patients with cystic fibrosis: a literature review Effect of oral high-frequency oscillation technique at different expiratory pressures on heart autonomic function and cardiorespiratory parameters
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