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Welcome and thank you for your question.
I am a qualified MD with more than 20 years’ experience and I am happy to help you with your question today.
What is your BP and pulse rate?
What medicines, if any, are you on?
I would prefer to continue with text, if you do not mind.
Muscle twitches generally occur due to :
- Muscle strain
- Electrolyte imbalance
- Calcium and/or Magnesium deficiency.
- Certain nerve conditions like ALS.
In your case, since you are very active and cycle regularly, it is very likely that you are suffering from dehydration and/or electrolyte imbalance.
Please do slow stretching exercises of the affected muscle. Drink adequate fluids with at least 1 glass of an electrolyte fluid like gatorade.
Take Calcium supplement.
Get your Vitamin D level tested - a deficiency can cause decreased calcium absorption from the gut.
If these steps do not help, please consult your doctor for tests on the nerves.
I hope this helps.