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I do combat sports, and in these sports there are a lot of hits that can cause bruising.

I've found that, over time, physical conditioning can reduce and/or eliminate the bruising to the point where even after hard impacts, there is no residual bruising.

However, I was under the impression that it is not possible to "condition" for reduced bruising since bruising is the result of ruptured capillaries, and you can't condition to not rupture blood vessels.

Can someone offer an explanation to why, with conditioning, it is possible to reduce/eliminate bruising?

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Speculation: It may have to do with an increased capacity for repair. While you will still bruise from impact, the intensity and duration of the bruise are more limited due to a quicker/more efficient healing response. –  leonardo Jun 8 '13 at 12:17
    
Hi Leonardo. Thanks. What causes the increased capacity for repair? Is it increased blood flow? –  me2 Jun 8 '13 at 16:27
    
healing, esp speed of repair would be dependent upon your genetics as well as your nutrition –  shigeta Jun 8 '13 at 16:49
    
Shigeta, genetics and nutrition has nothing to do with this topic. Please read the question. –  me2 Jun 9 '13 at 5:48
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