5. How to Ingest and Expel Air
In tea drinking method, breathing stops temporarily while you swallow air, which is why you take only air into the esophagus to produce one sound, "ah." Two ways enable you to take in much more air -- injection and inhalation.
(1) Before injecting or inhaling air, first expel it through your tracheostoma. Breath in using abdominal respiration to thoroughly distribute it throughout the lungs. Your chest expands, esophageal pressure decreases, and the esophageal mouth opens. In this moment, injected or inhaled air can easily pass through the narrow part to enter the esophagus.
(2) Injection
X-ray photography performed to observe the motions of the injection of air into the esophagus in slow motion, shows that action starts with the tongue moving backward.
The lips are closed and the dorsum of the tongue rises to send air backward. At the same time, the part from which the uvula hangs obstructs the passage to the nasal cavity. (This prevents air from going into the nasal cavity, which occurs by reflex.)