[Paddlewise] Cold water adaptation

As a Southern California paddler I have noticed that when I travel north
to colder water it takes a few days of paddling for my body to adapt.
Rolling practice the first day typically results in ice cream headache
and dizziness/disorientation. The next day the effect is reduced and by
the third day it is typically not a factor.
I have read about this same effect in others in a Sea Kayaker article
about a rolling competition in Greenland.
I have my own guess as to what is going on, but does anyone know
specifically what causes this adaptation?
It is not just a matter of getting used to it, because there are
specific symptoms which go away, as opposed to just being able to put up
with the cold.
 
             Steve Brown
 

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