Drea Exercises with the Bypass Plugs (MP4 - 1080p)
Our set of bypass plugs was developed to test the ability to sustain pressure while blowing air, as opposed to just developing pressure against a closed tube. Drea goes through the sequence of plugs with holes whose cross-sectional area is reduced by half each time. She is instructed to take in a full breath each time, and blow out as hard, fast, and completely as possible. This causes each successive trial to record a higher pressure and a longer time before airflow stops.
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