Isn't a problem for me...unless I just don't notice the power surges because my core temp is already cranking the internal furnace from the biking exercise itself. Then again I'm well past the stage where those power hits were annoying.

It could be that the excercise is raising your core temps, and when the surge hits it throws your body's already heightened internal temp right up to red line.

Black Cohash has been the centuries old remedy for heavy power surges. Vitex for the low or mild warm flashes. Both herbs, so they are available just about anywhere. They do work, and they don't mess up your system. You might want to try them first to help regulate those surges, then see how things go when you throw biking into the mix.

Good luck!

PS - when you hit 50 posts ask Siu for a key to the woman's forum.