Changes

The heart of my [[DIY Altitude Training]] system is the 'hypoxicator'. The principle of this altitude [[Altitude Training]] system is that you rebreathe your exhaled air, and each time you do so the oxygen level drops. This creates air that has less oxygen, which simulates high altitude. However, you can't simply [[Breathing| breathe ]] into a bag because as the oxygen level drops, the carbon dioxide levels rise. This rise in CO2 will cause you to breathe deeper and faster, leading to dramatic panting without any drop in your blood oxygen level ([[SpO2|SpO₂]]). To overcome this problem, your breath must go through a CO2 scrubber, which is the function of the hypoxicator. This hypoxicator is essentially a box filled with a chemical CO2 scrubber, plus attachments for the breathing hoses and filters to keep the scrubber in the box. I made mine for less than $20 plus the cost of the CO2 scrubber.