Longer than normal aching legs

I recently did a short but hard ride hitting well above my average for power and speed. Although hard, I felt good afterwards. The following day I did a 30 minute high cadence session on the turbo in the inner ring as a recovery. For the last 3 days, my legs have ached like never before with me having to bail during the final phases of a Sufferfest Full Frontal session. I've rollered the top of the thighs afterwards and they do feel a bit easier as a result. I also checked my BP which is bang in the optimal range. Could it be I simply needed to allow longer recovery after a long HI session and to do an easier recovery session the following day?
I ride a bike. Doesn't make me green or a tree hugger. I drive a car too.
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If you are training a lot in warm weather then it might be worth considering your intake of these crucial components: calcium, magnesium, potassium, sodium, phosphate and chloride.
So over the course of a week, going out everyday for 2+ hours, only two rides were power training rides. The other five rides were quite gentle, where I used easier gears and tried not to go anywhere near 275W+.
2020 Voodoo Marasa
2017 Cube Attain GTC Pro Disc 2016
2016 Voodoo Wazoo
How do you find that out? I have been pushing myself on nterval sessions more recently, but have tired thighs almost constantly.