Muscle fatigue, any ideas?

Experienced racing cyclist. Probably raced 7 seasons now. Was flying last week majorly competitive, this weekend dropped in first 5 mile. Tonights club race dropped after 2 minutes. Extreme muscle tiredness. Feel like I have rode 90 mile prior to starting the race. Breathing and heart rate not even getting the chance to get high before legs blow out. Never ever experienced anything like this. Any ideas?
"It was eleven more than necessary."
-Jacques Anquetil (after winning a race by twelve
seconds."
-Jacques Anquetil (after winning a race by twelve
seconds."
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Any medicine changes?
Any recent illness?
Sleep reduction?
etc.
Jay Kosta
Endwell NY USA
A lot of variables there Jay
Legs feel fine of the bike, and even at 18-19 mph feel grand. The minute the pace goes 21-22 my muscles go weak. Very weird.
-Jacques Anquetil (after winning a race by twelve
seconds."
When was the last time you spent 2-3 or even 4 days off your bike? My own mantra in this same situation is, 'I don't get fitter by training harder, I get fitter by recovering properly'. I am in the same situation as you are. Recovery ride yesterday rest today. Easy ride tomorrow, race on Sunday.
Ski to live
You're strong but you're human. Also, given the time of year, back off on volume but really hit the high intensity interval work. That might help with your race pace. But rest, take some Vit C, b6, B12 etc. and stretch and use the muscle roller.
Best of luck, let us know how you get on.
If you blow up suddenly when the intensity goes up, that would suggest being under fuelled and/or severely glycogen depleted.
You can probably run on fat at lower intensities.
As others have mentioned, it might be lack of rest/recovery, or inadequate carbs.
But what you describe seems unusual if it happens early in a ride when you haven't previously expended a lot of calories/fuel - especially if you felt fine beforehand.
Has there been any change in the pattern?
Jay Kosta
Endwell NY USA