After exercise or after eating too much food (or both) I usually become tired. I regularly observe that if I strech or engage major muscles (chest or legs) my breathing rate quickens considerably in the space of just a few seconds (which is different when I'm not tired). Is this due to low blood pressure or a slow blood circulation?
I'm mainly asking this out of curiosity, and I'm not sure if anyone else has observed a similar effect. I can't come up with a satisfying explanation myself.