Our expert says:
It's not normal, no, but I'm at a loss to explain what is causing it. It can't be due to overtraining, because that's a more gradual decline and yours seems to be pretty profound and instant. Is it possible that whatever they are treating you for is also linked to the weakness? If there is a problem in the back, it can often lead to muscle weakness because all the nerves come out the back. This might also cause cramping in addition to muscle weakness.
It doesn't sound like normal fatigue, but perhaps by this stage, it has corrected itself (sorry for getting to you so late - I answered all the questions but for some reasons these two days slipped through the cracks). I think you need to just back off, train less hard and you're within your rights to challenge the bio, because though I don't know the specific numbers here, if you are genuinely cramping and dropping your performance level by this much, it may be suggestive of something worse.
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