Rise in blood pressure?
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I am going to speculate here, but I am going to guess that it is due to a sudden increase in blood pressure. The same kind of feeling can be experienced if your inhale deeply, then hold that breath and "bear down".
Hope this helps...
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Cliff Etzel - Solo Video Journalist
bluprojekt | solovj.com - my blog
"To live the liquid life is to experience the rehabilitation of our bodies and minds as they evolve in the underwater world by not using any form of mechanical breathing apparatus - this is the essence, the purity of purpose of freediving."
Aharon Solomons
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