100 ml / 4 liters = 2.5%.
2.5% of CO2 laden air (~50,000 ppm) + 97.5% fresh air (420 ppm) = 1640ppm.
1640 ppm of CO2 is very much into the 'feels drowsy and hard to concentrate' region.
2.5% of CO2 laden air (~50,000 ppm) + 97.5% fresh air (420 ppm) = 1640ppm.
1640 ppm of CO2 is very much into the 'feels drowsy and hard to concentrate' region.
Lungplus is just a silicon wrap around a package of corrugated metal wrapped around itself so the air pathway is straight and very open and easy to breath through. Each pipe is about a millimiter in height and 2-3 in width. It still heats up the air very well at least down to -35 C at which time the freehub starts freezing and I can't bike anyway :-)
When exercising, the tidal volumes are far higher (2-3L), and you breathe faster, so the lung air is at least twice as fresh as it was at rest, probably more, since fresh air is functionally 0% CO2, and you're moving maybe 6 times the gas volume in each direction.
Does that massive change in volume and diffusion gradient (at least at the start of a breath) means that you might be able to tolerate a higher CO2 level in the inhaled air?
I guess the two valves in working masks are then quite essential, and normal breathing masks better have as little extra space for air in them as possible.