I think you raise an interesting question that should be addressed. I know that Kirk is in Miami teaching a clinic and will be in Kona in the next few weeks teaching another one. He is currently working on a research project at Simon Fraser University in Canada about studying some of the physiological effects that occur while freediving.
I will pass along your question and see if Kirk might be able to respond with his current busy schedule...
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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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