..., maka kita melawannya dengan menghirup napas bertekanan

Napas bertekanan? Apa ini?
Semacam teknik bernapas yang menunda pengempisan kantung paru, sehingga mempertahankan atau menaikkan kadar oksigen darah. Di ketinggian, oksigen darah dapat turun drastis, bahkan di bawah 90 (kalau terjadi pada penderita COVID-19, ini alamat butuh ventilator).

Tontonlah video berikut:

https://www.youtube.com/watch?v=U-ZPjlWK0jc
Demonstrating how effective pressure breathing can be to raise your blood oxygen level. This was shot at the trailhead parking lot at Bunny Flat on Mt. Shasta (6950'). My normal blood oxygen level at sea level is 98-100%, but it is dramatically affected by altitude.

Nah, yang ini menjelaskan sedikit teknis:
https://www.summitpost.org/phpBB3/pressure-breath-explanatio...
"Pressure breathing" is ... keeping a bit of positive pressure in the lungs at the end of expiration, just a bit over ambient pressure. ...

The analogy is the balloon from the party store. The initial breath to get the balloon open takes a lot of pressure, but once it's blown up you can inflate and deflate rather easily - as long as you don't let the balloon fully collapse between breaths. If you let the balloon fully deflate, then it takes a hard breath to re-inflate.

Pilihan lain?
Buat dramatis: menyedot kuat-kuat napas bertekanan, atau tidak harfiah: menerapkan teknik napas bertekanan.