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Your heart changes when you ride lots. It gets mega efficient because the muscles get really toned from all the pumping. But also you will probably find it hard to get your heart rate up high if you really try, so you won't be able to get KOMs on sharp climbs.
If you were to just stop riding and do nothing it might not be good for your heart to go from massive amounts of load to zero - a more gentle wind down is meant to be better.
UPDATE: So I'm currently 15km up and on day 145 of the challenge, I'm pretty happy with being back on the positive side of this and have managed to get myself in a good routine with riding.
I rode 200 miles on Sunday (although strava doesn't say this as I stupidly paused my wahoo for 30 odd minutes), it was a long day but I actually really enjoyed riding for that amount of time. I set out to enjoy the ride and to get my friend to complete the distance. It was also the first time I've worn a HR monitor for a while, I was more interested in calories burnt but I was very surprised with the result. I guess the fitness gained from this challenge has showed as my average HR for the day was 108 bpm which is mental as there was points when we were at the organised stops when my HR was higher when eating then when I was cycling.
Riding a bike for 13 hours is an amazing experience and I'm definitely going to do it again soon, I'm even thinking of doing a 500km ride in August. Would anyone be keen to join?