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From Fellrnr.com, Running tips
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* Some guidance on IHE plans can be found at [[Intermittent Hypoxic Exposure]].
=After Use=
After you've finished using the system, disconnect the parts to let them dry out. However, the hypoxicator should not be dried out as moisture is part of the CO2 scrubber. You should check =CO2 Scrubber Replacement=Because the CO2 scrubber uses a chemical reaction to remove the color CO2, it will become exhausted over time. I've found that the scrubber seems to last much longer in my DIY system than the [[AltoLab]] system I used before. The best indication that the scrubber is exhausted is that you will feel a change in your lungs. This feeling is due to the buildup of CO2, which creates a strong desire to breathe, and you will feel like you can't get enough air. If you have that feeling, it's time to replace the CO2 scrubber immediately after . The scrubber has a color change indicator that will go purple, which you can see if you use a clear sided container. The color will change even on the first use as , but it will turn purple when fade after a few hours. I've found that once the color change is still present next time I come to use the system it's exhaustedprobably close to exhaustion. {| class="wikitable" |- valign="top"|[[File:ExhaustedScrubberOverview.JPG|none|thumb|500px|This is how my CO2 scrubber looked at exhaustion. Note that this is the day after it was last used, but and the color has faded.]]|[[File:ExhaustedScrubberCloseup.JPG|none|thumb|500px|This is a close up of the CO2 scrubber.]]|[[File:ExhaustedScrubberImmediate.JPG|none|thumb|500px|Immediately after use the CO2 scrubber had a much darker color will fade. ]]|}
=Iron Deficiency and Anemia=
If you are deficient in iron then it will be difficult for your body to adapt to altitude training. The best thing is to get your iron levels checked with a serum ferritin blood test. I have mine tested periodically at a local [http://www.walkinlab.com/ferritinserumtest.html Walk In Lab]. The cost is about $40, though they sometimes run offers.
=Feedback requested=
If you build one of these systems, I'd be grateful if you let me know how you get on. I'm also interested if you find any improved parts or other suggestions for improvements.
