Splinter thread from....
http://forums.deeperblue.net/general-freediving/78948-praise-shallowness-2.html#post722758.
Mod please remove the i in the title iscience.
http://forums.deeperblue.net/general-freediving/78948-praise-shallowness-2.html#post722758.
Hey Trux- or anyone else,
Sorry to derail, but there is soo much bad information out there on SWB. So much confusion, and it is the most serious problem spearos face(as someone wiser than me said).
I have often wondered a couple of things. Maybe i should just use the search forum or start a new thread. Upon surfacing from a very deep dive gas bubbles can come out of your blood stream, even when just free diving (as evidenced by free divers even getting the bends, which is an extreme case of bubbles). When these bubbles (assuming they are larger than 8 um) get lodged in your pulmonary capillary bed to be destroyed, they have been shown to dramatically increase the blood pressure in the pulmonary artery. My question to you is have you ever seen reports of this adding to the SWB? Lets say if someone did 20 or so deep dives.
Secondly, blood pH affects heme/O2 binding. When acidic (muscle capillary bed), O2 is released from Heme and when its basic (pulmonary capillary bed) it binds - well lets not say it binds but is more sequestered out of solution into a complex with hemoglobin, thusly reducing its partial pressure. This dramatically affects the partial pressure of O2 in the lungs and in the muscle. Can anyone correlate this with changing blood pH when you dive? Does the blood pH drop at the end of the dive in the lungs, whereby reducing the pH gradient allowing for O2 to be released back into the lungs? Because otherwise O2 will never be allowed to backflow like we have talked about.
Mod please remove the i in the title iscience.
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