diaphragm

Typical features include frequent deep sighs, rapid breathing, forceful exhalation from the abdomen, or chest breathing without proper diaphragm use, which prevents the lungs from fully expanding.

For example, “Pinky could conclude only that the strength of the floor diaphragm where the trench headers bisected the slab was inadequate.”

I couldn’t speak or do anything other than force up my lines using my diaphragm alone.

"In other words, air had been injected into her stomach. That interferes with your ability to move your diaphragm up and down, and that interferes with your breathing," he said.

That, in turn, causes them to “asphyxiate because their diaphragm has too much pressure on it.”