I thought athletes used sodium bicarbonate to buffer the production of lactic acid during anaerobic activity. I've never heard of it as a stimulant. Can you provide a source for that mechanism?
Try it. Heaped teaspoon in a glass of water, give it 30mins. You'll notice the difference if you are walking around or doing more vigorous exercise like jogging or running.
Sodium/potassium kinase pump. https://www.ncbi.nlm.nih.gov/books/NBK537088/
Sodium - releases calcium, increases a chance of a heart attack. FYI! https://pubmed.ncbi.nlm.nih.gov/2158146/#:~:text=In%20respon....
CO2 levels. https://www.epa.gov/sites/default/files/2015-06/documents/co...
This is what you are referring to https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6544001/
There are other mechanisms, like the effect sodium has on adrenal gland.