I've not been in contention much for top 10 Tiny Race finishes since my mid Feb to mid March lurgy, so I've not sprinted often for 2+ months, but I've had the odd one where my heart rate hit 178-182. In race #2 on Saturday, I did a longer race finishing effort up the ramp and then slightly down to the railway banner finish, where my heart hit 185 for the first time in months if not over a year and I just missed out on an extremely rare pen D podium.
Was so fatigued Sun-Tues besides a brief period Monday afternoon (plus had to scale back my efforts in races 3 and 4 on Sat), where I started stage 2 Pas Normal and then turned it into a recovery ride half way through. Then discovered my heart rate the last two evenings has been crazy high for while sitting around, like ~90 instead of ~65 (my true resting heart rate is probably lower but I do drink quite strong coffee, normally 4 per day, used to be ~8 until few years ago), seems more normal today, but a bit disconcerting aged 52 despite how my fitness it nothing like it was when I was 48...
Guess it was a combo of race fatigue and drinking more strong ground coffees this last week after a big effort by my standards in the first running of Pas Normal stage 1, despite all the in-race weirdness.