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#DiveNerd

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Giant

Now the stuff, as promised:
One quick note for anyone considering doing likewise is diving can be super dangerous for people with lung conditions in particular because of the increased risk of the very worst kind of diving injury. I'm also using an aggressive oxygen dose ceiling, which is another risk. Either of these risks are the kind that could kill you. Clearly, I do dangerous stuff when it's fully my own choice and the only one at risk is me. Anyways...
For 5 weeks, I did 3 dives per day lasting between 1 to 1.25 hours and breathing air with oxygen content enriched to 0.33.
So 33% OX 3 times per day for an hour, right?
Wrong!
Since we're diving, we're breathing gas mix under pressure varied according to depth. For example: 33' depth is equivalent to one additional atmosphere of pressure compared to ambient pressure at sea level. Thus, the volume of a measure of gas at sea level is halved at 33' depth. Said another way, the dose of each gas in an equivalent volume is doubled. For each additional 33' of depth, add another atmosphere of pressure, and increase the multiplier on the gas dose by one. So 33% OX at 66' depth is equivalent to 100% OX at sea level. Go deeper, and you get OX concentrations greater than 100% OX equivalent at sea level.
Here's the depth profile of my favorite dive from this last trip. Others were similar:
* 110' for 5 minutes (143% OX)
* 90' for 5 minutes (123% OX)
* 80' for 5 minutes (113% OX)
* 70' for 10 minutes (103% OX)
* 60' for 10 minutes (93% OX)
* 50' for 10 minutes (83% OX)
* 40' for 10 minutes (73% OX)
* 30' for 10 minutes (63% OX)
* 20' for 10 minutes (53% OX)

So it ends up to be between 53% and 143% OX * 1 hour * 3 / day * 5 weeks. This seems to have helped quite a lot with my particular symptoms. YMMV

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Public
Giant

I've essentially done 5 weeks of self-administered oxygen therapy (I'll follow up with details. It's stuff), and my cough is all but gone. So I decided to give it a little test and go for a little super-easy run.
It's expected that starting again after some months off should be a bit miserable at first, and I can report no surprises there: yes, a bit miserable. But also not as bad as I feared. I felt a bit asthmatic at the end, but otherwise fine.
I was feeling pretty optimistic until I compared my garmin stats from before I got COVID to today. I mean, I do have optimism that I may be able to start to pick up some running again, but comparing current measurements to what they were before, or even what they had been after recovery from some injuries, it's clear my health is compromised. This chart made my jaw drop. I didn't know this chart even went this low, lol:
1/2

A chart showing my performance condition on the y axis, and distance on the x axis. At start, I'm at about performace condition = -3, stair stepping down to about -9 when miles = 1.35, and eventually ending at -10 when miles are just over 2.2
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