You need to be very careful exercising with graves. I am a marathoner and triathlete. The first time I was diagnosed with gd in 2002 I was training for a marathon, which I ran on beta blockers. I was diagnosed after passing out on a run, I had a resting pulse of 150 and overworked my heart while running after only about 2 miles. As for running a marathon on the beta blockers, It wasnt until medical school when I learned that this is infact quite dangerous because of the effect the drug can have on escalating potassium levels in the bood (which under the righ conditions could lead to major heart problems and in the most sever cases even death). It is important to undertand the long term negative effect such strenous exercise can have on your heart and as a fellow athlete I am positive you want your heart muscles to be fully functioning for years to come… so just wait it out. I went into remission after about 1.5 years on anti thyroid drugs then relapsed jsut last fall (2007) I was running and after 3 blocks on flat groud my pulse jumped to 190. I had to take a full month off, it was aweful, but the fact of the matter is it can seriously damage your heart to the point of ventricular hypertrophy, which as lasting negative effects, and that is far worse than a few weeks of no running. Good luck, it will work out ok, I am back up to my normal routine now, and of course, back on the antithyroids… but at least I can run again.
