I just read an article, people with type O blood bruise more easily that those with B or A. Type A's bruise the least. Other factors are high blood pressure, or if you take asprin, ibruprofin (show me a cyclist that doesn't take vitimin I!). I used to take Ginko Biloba, but stopped 'cause I started bruising horribly!

Here's their solutions:
1. Apply direct pressure with ice to constrict the blood vesssels

2. Elevate the injured body part higher than your heart (I have visions of us all doing shoulder stands when we bang our knees.....)

3. Eat a diet rich in fruits and vegetables.

The full article is in the June 2004 Shape magazine.