48yo M here. This year i have dropped 53lbs and built to 15k+ yds/wk. Last week while donating at red cross the nurse taking my vitals looked at me while taking my pulse and said "46." I said "no way." and checked my watch and... sure enough. Since then I've been looking and resting hr is generally 48-52 (58 as I'm typing). I know that a slower heartbeat is, generally speaking, a good thing and a result of activity but being in the 40's so often is a little disconcerting. Before I started my no booze swim regimen in January my standing hr was like 68.-72, so the drop is significant.
My hr for swims seems to be okay. my distance/stroke sets get me to 130-135 and sprint sets will get it to 145, and I'm under 80 after like 100-120 seconds of rest. And I have no other symptoms of concern. My diet is balanced and junk/treats are minimal. BP is a seady 120/80.
But heart disease in my family is rampant and, like I said, 46 is a scary number to me.
I called the doc and made an appt for next week to be sure. In the meantime, should I be backing off just in case?
Thanks for any advice.