Any way to measure this (cheaply) just for curiosity?
The most basic CO2 monitoring devices (no app support) are around US$40
1 Like
In the context of a room with a turbo in it, that’s a new one on me!
It’s a room with you huffing and puffing in it 
Tiny basement prison-cell type pain caves are the worst
1 Like
Basement here 
Not tiny, but still basement…only a very small window. Nothing I can do about it. So - again - I have to live with it 
Thanks again for all your valuable input!
I hadn’t really thought about CO2 accumulation but it makes sense.
It got me thinking about whether those oxygen concentrators (the things that people with respiratory problems wear/carry) would help here. They are kind of pricey - more than I thought they would be - and I don’t know if it would actually result in a net increase in oxygen available to you.
There are also (who knew) oxygen canisters that you can buy. Also expensive but it seems like that would be even better (net increase in oxygen in the room).
Would this be considered cheating in a race? I know it has to get in line behind all the other forms of cheating but I guess I’m asking if you think this would be ethical.
Didn’t expect to go down this rabbit hole today…
Personally I would invest in ways to move air into the room if that’s what’s needed. Even in a basement that is probably possible if willing to spend a bit of money. I don’t have a problem with the ethics of having better air to breathe because as you say it’s so far down the list. I just don’t think O2 is a good investment and it’s a substantial fire risk in your home if you don’t really need it to stay alive.
sounds like the UCI would allow it?
Distinction from supplemental oxygen
The UCI’s ban is not a general prohibition on all oxygen use. Inhaled supplemental oxygen itself is not considered a banned substance by the World Anti-Doping Agency (WADA). The UCI’s regulation is focused on the rebreathing systems that utilize carbon monoxide for its blood-boosting effects, which were being used outside of sanctioned medical conditions.
I wonder if co2 buildup on your indoor cyclingspace (i hate the expression pain cave) is necessarily a bad thing as the body would start compensating for the resulting respiratory acidosis with metabolic alkalosis increasing performance (ingesting large amounts of bicarbonate has been proven to increase performance)
I suppose no opportunity to vent air in and out with intake fan and exhaust fan?
You might also look into air filters as well to clean up some of the other nasty things typical of basements.
I think that Zwift won’t automatically reset your FTP value if the result from one of its tests is lower than the value that was already set. Not sure if this applies to you. I think the automatic resetting of the ftp value is only done when the test result is a higher value.
Thanks for all your input. Just to report back: I’m not entirely sure, but it seems that how tightly the power meter pedals are mounted makes a huge difference in the power readings. I recently tightened mine with a torque wrench, and on the ride afterwards the numbers were really strange (far too low). At first, I thought the pedals were broken, but then I discovered that they can be calibrated in the Garmin app. After calibrating, a short test ride gave more reasonable results – still slightly lower than before, but it feels more accurate now. So this might have been the issue (perhaps the pedals were showing too high values earlier). Just sharing this in case anyone else runs into the same problem.
Over 1400ppm after only 30 minutes 
1 Like
I now use a core Heat sensor, and even with open window, not racing, with both wahoo headwind and the small fans of my tacx neobike on, my temperature is 38-38.5 degrees when zwifting. On the key moments of long races i go over 39 degrees. 39.1 is a key moment, my power drop and I feel “not powerful”…
I didn’t perceive my heat changes before, and when I monitor my heat outside it is similar. Easy to get to 38.5 and it’s ok, but more than 39 means power dropping fast.
1 Like