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HealthScan makes a similar device. Depending on your lung function, I would talk to your doctor because with these devices you create a pressure inside your lungs.
If you close your lips, and try to breathe through your mouth the experience of using this device is just about the same. With the machine you can measure the training
Doing this time after time can possibly cause acid reflux because you are creating so much pressure on your diaphragm muscle it puts a pressure on the stomach as well and the rest is history
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