For me, I find that really concentrating on the rhythm of my breathing helps with stitches - I would really think about getting oxygen into my lungs and concentrate on sending the oxygenated blood to the painful area. Obviously this is nonsense, I'm not convinced that its possible to direct blood flow consciously, but it worked for me. Now I only get them the first run back after a break from exercising.
Re. the heart rate - I believe that having different heart rates for different sports is a reasonably well known phenomenon in Triathlon. Swimming HR is usually lower than cycling which is lower than running for the same RPE (Rate of Perceived Exertion) - similarly I find my HR on the rowing machine is higher still. So yes, having a slightly higher HR when running is normal - when you get used to it you'll work out what your target HR is for each sport.
For me, I find that really concentrating on the rhythm of my breathing helps with stitches - I would really think about getting oxygen into my lungs and concentrate on sending the oxygenated blood to the painful area. Obviously this is nonsense, I'm not convinced that its possible to direct blood flow consciously, but it worked for me. Now I only get them the first run back after a break from exercising.
Re. the heart rate - I believe that having different heart rates for different sports is a reasonably well known phenomenon in Triathlon. Swimming HR is usually lower than cycling which is lower than running for the same RPE (Rate of Perceived Exertion) - similarly I find my HR on the rowing machine is higher still. So yes, having a slightly higher HR when running is normal - when you get used to it you'll work out what your target HR is for each sport.