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Originally Posted by OceanMan
I think there could be several advantages:
- preventing the O2 from going back in the lung (from the blood) during the last 30-20m of ascent. Thus reducing the risk of BO/samba at the surface.
- keeping a strong bloodshift until breaking the surface. Hence, the legs don't burn much oxygen and the extra effort due to the fact that the diver is less boyant is not that worrying (in theory).
- when packing I have always thought that not exhaling during the last few meters of ascent is dangerous for BO/samba reasons (blood suddenly going back into legs/arms/tips) and also for packing injuries reasons (max lung volume+packs reached in a few seconds).
- you can do a strong inhale as soon as you break the surface and renew a lot of air from your lung immediately.
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I have heard that it is good to exhale a bit when ascending after packing, because of the risk of injury. I am not so sure about whether exhaling a lot is a good idea. I have been told that exhaling before surfacing is not good in pool training, because of the risk of blackout. I wouldn't do it because of the risk of blacking out before reaching the surface, and sinking with empty lungs, possibly inhaling water.
I'm not an expert though.
Lucia
