Question

How does the Colorado Exercise Room (CER) simulate altitude?

Answer

The altitude simulation is created by decreasing the percentage of oxygen in the air.

The air unit pumps in air that is 13% oxygen, which mixes with normal 21% air.

It is then monitored by the controller, which contains an oxygen sensor that keeps the percentage of oxygen at the desired equivalent altitude (usually 9000 feet).

CAT uses a blow through system instead of recirculation, which creates a constant flow of fresh air.