I'm not saying you or the text is wrong, by any means. But I sometimes feel like passing out at the gym when I do a hard set. So maybe we should move quickly away from the squat rack and start skipping rope or doing jumping jacks? I don't know. I just hang on to the equipment until the feeling passes. But if that's so, that all that norepinephrine is being secreted after every set, that's got to add up! So something else must be going on as well, or perhaps the norepinephrine is very quickly resorbed? Someday RN? I never have that feeling after cycling, perhaps because it's a hundred yards from the end of the sprint to my car, and that's adequate?

Norepinephrine triggers the baroreceptor reflex. From Wikipedia:
"In cardiovascular physiology, the baroreflex or baroreceptor reflex is one of the body's homeostatic mechanisms for maintaining blood pressure. It provides a negative feedback loop in which an elevated blood pressure reflexively causes blood pressure to decrease; similarly, decreased blood pressure depresses the baroreflex, causing blood pressure to rise."

All very interesting. Thanks, Machka.