I don't know the answer to that, but there is a lot of depression among well-known boxers. On the other hand these guys are often facing other problems and the rate of depression in the public generally is higher than is normally perceived.
I haven't over the decades seen a correlation between boxing and bipolar / manic and I tend to doubt there is one.
I have seen many cases of boxers with depression, but, as I'm sure you know, that is very different from bipolar.
A lot of the boxers with depression later expressed a need to stay away from recreational drugs. Bipolar on the other hand is not, to my knowledge directly connected to drugs, exercise or even head trauma.
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