Here is an inquiry I received that I think would be helpful to may people:
I practice Bikram (ie., hot) yoga. I also sing in a community choir here in Salt Lake City. When I do yoga I almost always suffer significant weakening of my voice (it becomes constricted, and I don’t have my usual power or resonance), and in addition, as a low bass, I usually lose about the bottom minor third of my range. It generally takes 36 to 48 hours to recover.