Warfarin inhibits blood coagulation, making you bleed easier, with weight training, heart rate increases and stroke volume increases causing high blood pressure and with stretching of the muscles during weight lifting can easily rupture small blood capillaries and the clotting factors II, VII, IX and X, protein C, protein S, and protein Z synthesis is inhibited by warfarin so clotting of the ruptured blood vessel cannot take place, causing hematomas (blue blacks) or hemorrhage.

So if you're squatting, blood vessels in the knee might get ruptured and coagulation fails and you'll bleed into your knee joint.

http://en.wikipedia.org/wiki/Warfarin

I can't find any journals about warfarin use during exercise, but there are studies about warfarin use in elderly people with myocardial infarction during exercise to reduce platelet aggregability, mainly to prevent further thromboembolitic attacks.

http://www.sciencedirect.com/science?_ob=A...0ac1ec53cf8cbea

Go to scholar.google.com to find more journals about it.

This post has been edited by Florian: Sep 3 2009, 11:39 AM