Thanks to all. I have now upped the dosage slightly and had a complete blood test which showed no abnormalities save the under active thyroid. I will keep running and try to get the dosage correct for me. Have two 10ks coming up so watch this space, I will tell you how I get on.
Just looked through some of the forum letters on the subject and remember having a few words with you a couple of years ago. Was interested in your dosage of Thyroxine. With no good advice I have kept my dosage at 150 mcg, probably should up the dose but didnt know if there was a maximum one should take. Had a new blood test this morning so await my results
Reading lots about Sports doctors and Specialists but nothing about long term health problems which affect running. I have been diagnosed as having an under active thyroid which requires medication in the form of Thyroxine for the rest of my life. Since diagnosis I have ran like a drain often feeling completely exhausted during races. On Sunday last I ran the Paphos Half Marathon and nearly dropped out at 8K, I continued by running/walking to the end and finished in my worst ever half marathon time and I have been running for over 20 years. I can get no advice on Hypothyroidism in runners.