[ConservativeMind]

She seldom used it, but, instead, does sprints for 30+ seconds at a time, every few days, which leave her panting.

CO2, which we exhale, dilates our blood vessels. You can lower your blood pressure, temporarily, by exhaling and not breathing back in for a few seconds.

Strangely, a keto diet generates less CO2 in our bodies, which would work to negate this effect:

https://www.dietdoctor.com/can-keto-improve-copd-or-are-we-getting-a-little-too-excited-about-possible-benefits

[RoosterRedux]

The reason I do keto is that it brings down my cholesterol, blood pressure, weight, etc.

My doc wasn't that familiar with it when I became her patient but she is now. And she likes it for the reasons I mention above.

I'm not sure how it affects my breathing or CO2, but I do at least 5 hours a week of hard cardio and that might counter any possible problems.

I mountain bike mostly, but will switch to indoor rowing when it gets colder. Did a ride today for 1 hr 36 min of heavy breathing. Cool air was perfect.

I have never had any trouble with my breathing, but I will keep what you say in mind and will look for articles on it.

If you have any in mind, please shoot me a link when you get time.