Like my father, I have always had low BP. In my 20s it was 90/60; around that time I started running and it registered 70-something over 40-something when my mom (an RN) took it one day. 35+ years later, my latest reading is 92/60. My resting HR is around 50; even when I was unfit, it was in the 60s.
I am wondering if this may account for feeling like someone pulled the plug if I'm outside in hot weather, and on rides when temps rise into the 80s. My theory is that when I feel hot, my BP goes even lower as my blood vessels dilate to cool the body; in turn, my heart rate rises to compensate, and this leads to early fatigue.
I'm wondering if anyone can offer an explanation and if this will improve as my overall fitness improves. I'm not worried about the low BP, but my brother shared something he heard while working in the ER about a possible link between a low HR and A-Fib later in life.
I need to find ways to stay cool on the bike this summer while training for events at the end of the year. Once I get hot, I'm wiped out for the rest of the day. I'm not overweight at all, and I always used to feel chilled even on warm days. But now, as a woman over 50, things have changed.