A kind of weirdness just happened. Literally overnight, on my second of back to back Turbo sessions, I've just performed some over-unders at 20 BPM lower than normal.. in HR terms I've ended up working out in the Aerobic zone rather than Threshold.
I found the work out ridiculously easy, so much so I jumped off after 10 minutes to check tyre pressure, turbo setup, gearing, resistance etc. Nope, no changes. Then 5 mins more and I cranked up the session to 105% effort, and still it felt easier than it should have.
I have been finding riding in general tough over the last month or so, but is it really possible to get the sudden leap in performance, drop in HR overnight?
Frankly its quite scary!