Jim has it right, exercise will increase your metabolism, and as a result will process the Coumadin at a faster rate. The best thing to due is try to establish a regular exercise program, and watch your INR until your Coumadin is adjusted accordingly to establish stabilization. Remember consistency is the key in what ever you do when on Coumadin
I workout 5 days a week, and at times when I travel and cannot get to a gym, I do notice that my INR will be higher than usual as a result of not working out, and breaking the routine.
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