Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
I am curious, how does this work? If anyone know?
I see
I read the link description that Johnny posted.
For the physicians
In the descriptions there are somethings I may misinterpretating, it tells you about deep inhale and deep exhale, will this not influence your yoyo buoyancy, if not then is your volume usage not higher ?
I'm curious of this gadget more for musle training of my respiratory system under high ambient pressure ( deep diving ) and morr controled breathing in the unlikely event of a restrictive regulator