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>George Irvine wrote:
>
> Another trick, and this is only for those who may need it, is to do 
>hypoxic stuff, but be sure there is somebody watching you, like a lifeguard. 
>This should follow a set of hard stuff, so you are a little on the streessed 
>side. Do repetitive hypoxic sets, and it will hurt, but it will work.

One exercise we use to do for competitive underwater hockey was called 
half and halfs.  We would swim half the pool length on the surface and
half underwater.  This was done as a series of wind sprints with a short
rest period ( about 10 seconds ) between each length.  The trick was
to be the fastest in the group so that you got the longest rest period.
Anyone who got too fast had to swim in a sweat suit.  This drill can quickly
build severe O2 deprevation and CO2 levels and does wonder's for ones breath 
holding.  I would be concerned thought that this sort of exercise would
make one a CO2 retainer and lead to increased risk of oxtox.  We never
had anyone pass out although I recall a few people vomiting, which the pool
staff tended to frown on.  From time to time I would experience tunnel vision,
a burning sensation on the face or loose control of my respirations.  This 
is probably a good time to quit.  It helps if the person calling the drill 
is standing on the side of the pool and has no motivation to let you dilly 
dally at the ends.

Barrie

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