It doesn't seem to me to be wise to obsess over any particular sign, especially things like BP and HR. They are only valuable when viewed in concert with an overfall assessment. To do otherwise can either cause you to be a bit hypochondriacal, or to ignore other symptoms that may be pointing to a serious problem. It is probably OK to satisfy a bit of curiosity. It is also probably OK to use HR as a personal refection of physical performance. Beyond that they are just a couple numbers in the whole paint-by-numbers picture of our body.