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I should correct this statement:

>100ml extra apparatus dead space additional to 300ml physiological deadspace 
>in this 1000ml tidal volume is still large.

It is only the anatomical deadspace that is rebreathed not physiological 
deadspace.  Anatomical deadspace is 100-150mls and is only influenced 
slightly by tidal volume, increasing about 20mls per litre increase in TV.

Counting my breathing rate, trying to mimic what I would use diving was 
about 8-10 so I might also revise the TV estimate to 1200-1500ml.  Does 
anyone want to calculate their gas consumption rate and estimate their 
respiratory rate during a working portion of a dive over the weekend?

regards,

David Doolette
ddoolett@me*.ad*.ed*.au*

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