Rebreather World - View Single Post

depth · 16th July 2007, 19:31

Hi Dan

Ok, my bad, I should be more specific. The 4.8l. is my Forced Vital Capacity (FVC). FVC is defined as: "The amount of air that can be forced out of the lungs after a maximal respiration". I know that the amount of air exchanged in the lungs during normal breath is much smaller.

I should have checked the terminology before posting my question, sorry!

This is also the reason why i postet the question, I do not have much knowledge on this specific topic :-)

Quote: (Originally Posted by DanDunfee)

Christian

I'm really quite surprised at, what I interpreted as, the 4.8 l that you quoted above as your personal lung tidal volume (TV)... particularly for your about-average size. Knowing a good, representative personal TV is quite important for many kinds of volume ( CLs, BCs and RMVs) , and gas-consumption calculations. I'd encourage you to recheck the value you quoted.

For my own frame (5 ft 8 in, and 205 lbs), my TV is ~ 2.2 l. There's a large body of USN data, on seasoned divers, that shows an average TV of ~ 2.1 l, with a very low percentage going over 3.0 l. This leads me to question your number.

16th July 2007, 19:31	#15 (permalink)
depth Christian Rasmussen Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2006 Location: Denmark Posts: 191	Re: Excessive counterlung volume on my MEG Hi Dan Ok, my bad, I should be more specific. The 4.8l. is my Forced Vital Capacity (FVC). FVC is defined as: "The amount of air that can be forced out of the lungs after a maximal respiration". I know that the amount of air exchanged in the lungs during normal breath is much smaller. I should have checked the terminology before posting my question, sorry! This is also the reason why i postet the question, I do not have much knowledge on this specific topic :-) Quote: (Originally Posted by DanDunfee) Christian I'm really quite surprised at, what I interpreted as, the 4.8 l that you quoted above as your personal lung tidal volume (TV)... particularly for your about-average size. Knowing a good, representative personal TV is quite important for many kinds of volume ( CLs, BCs and RMVs) , and gas-consumption calculations. I'd encourage you to recheck the value you quoted. For my own frame (5 ft 8 in, and 205 lbs), my TV is ~ 2.2 l. There's a large body of USN data, on seasoned divers, that shows an average TV of ~ 2.1 l, with a very low percentage going over 3.0 l. This leads me to question your number. __________________ I am not qualified to make my own meg batteries!!! I am not qualified to make my own meg batteries!!! I am not qualified to make my own meg batteries!!! I am not qualified to make my own meg batteries!!! I am not.............
(Online)