SAC versus depth

[mikerault]

Instead of dive number can you show the depths?

Mike

 

[bperrybap]

Instead of dive number can you show the depths?

Mike

Unfortunenately it won't.
However, I attached 2 charts that show the average depths
for the dives in the exact same order as the two previous charts.

I also attached a MS Excel file with the data so you can play
with it anyway you like.

I can export other fields like pressure used, tank size,
tank working pressure, etc... if for some reason you need them.

--- bill

 

[mikerault]

Sorry, eliminating the null results and the 0 result and plotting as an XY plot by increasing depth to SAC you get a decreasing SAC rate with your data when you plot the trend line. Here is the result. The same as the other divers who have sent me their data. The only one that didn't had so many outlayers the data was suspect.

Maybe it is related to N2 Narcosis and its effects on respiration rate? Just a SWAG.

Mike

 

[bperrybap]

Sorry, eliminating the null results and the 0 result and plotting as an XY plot by increasing depth to SAC you get a decreasing SAC rate with your data when you plot the trend line. Here is the result. The same as the other divers who have sent me their data. The only one that didn't had so many outlayers the data was suspect.

Maybe it is related to N2 Narcosis and its effects on respiration rate? Just a SWAG.

Mike

Very interesting. I bet there is some sort of slight impact on
respiratory rate due to Partial pressure of 02 and O2 levels.

If I remember correctly, the brain uses C02 Levels or carbonic
acid levels or H+ ion levels to detect its need for breathing
rather than actual oxygen levels in the blood.

Perhaps this detection method is disturbed or altered as the
partial pressures are changing and moving to new levels as the
diver dives. Perhaps there are other detection mechanisms
the brain uses that come into play a bit more as the
partial pressure of oxygen changes.

I am reminded of when I was hiking at 14,000 ft down in
South America. I was VERY winded when
going up steep trails or stairs. The oxygen content of the air is
still 21% and I bet my body was producing just as much C02
for the given amount of excersize/work load as if I were at lower altitudes,
yet my respiration rate was MUCH higher than at lower levels so
I was breathing a much larger volume of air per minute.

So perhaps there is some sort of converse relationship as well
that causes the respiratory rate to fall as the partial pressure
of oxygen increases.

Just thinking outloud a bit.......................

--- bill