Tidal volume varies

mets123 · Post by **mets123** » Tue Jul 11, 2023 8:49 am

I live in the north east and my tidal volume is usually around 500. I am in Denver now and my tv has been running around 380. No changes were made at all, could it be due to the altitude?

ChicagoGranny · Post by **ChicagoGranny** » Tue Jul 11, 2023 11:48 am

Compare your respiratory rates for the two locations.

dataq1 · Post by **dataq1** » Tue Jul 11, 2023 12:13 pm

Suggest comparing the minute ventilation rates for the two locations. The minute ventilation is the volume of (respired) air per minute. (Combines respiration rate and tidal volume into one factor.

mets123 · Post by **mets123** » Tue Jul 11, 2023 1:45 pm

As far as respiration rates they are the same, the minute ventilation has decreased.

dataq1 · Post by **dataq1** » Wed Jul 12, 2023 6:59 am

Well that’s not what might have been anticipated considering the altitude change.
Do you have any data on changes in your blood O2 saturation?

(Ultimately the whole purpose of the respiratory system is to maintain adequate O2 saturation and blow off excess CO2.)

mets123 · Post by **mets123** » Wed Jul 12, 2023 9:08 am

I’m on vacation and don’t have access to my oximeter.

mets123 · Post by **mets123** » Wed Jul 12, 2023 5:24 pm

Anyone else have any ideas?

ChicagoGranny · Post by **ChicagoGranny** » Thu Jul 13, 2023 11:16 am

mets123 wrote: ↑
Wed Jul 12, 2023 5:24 pm
Anyone else have any ideas?

You didn't say how you are feeling. Excess sleepiness during the day? Energy level?

mets123 · Post by **mets123** » Thu Jul 13, 2023 11:35 am

Chicago granny, thanks for your reply. Feel the same, no changes. My respiratory rate is the same, no leaks . Just that my tv is around 380 instead of my usual 500.

ChicagoGranny · Post by **ChicagoGranny** » Thu Jul 13, 2023 11:38 am

mets123 wrote: ↑
Thu Jul 13, 2023 11:35 am
Feel the same, no changes.

What's the same? Feeling crummy or feeling energetic or something in between?

mets123 · Post by **mets123** » Thu Jul 13, 2023 11:45 am

Sorry, feeling fine and energetic.

ozij · Post by **ozij** » Thu Jul 13, 2023 12:21 pm

ResMed wrote:Tidal Volume is an estimate of quantity of inhaled air
per breath, calculated as an integral of respiratory flow:
based on the leak flow, the mask vent flow and the
total flow rate. The display is based on a five-breath
moving average, updated every breath.

My emphasis:
Now, this it me trying to undertand:
If tidal volume is the amount of air
And if there's less air at higher altitude
Doean't it stand to reason that tidal volume would be lower?

Or is there something I'm missing?

ChicagoGranny · Post by **ChicagoGranny** » Thu Jul 13, 2023 12:29 pm

The machine has been tested to adjust to air density up to 9500 feet. Denver is about 5200 feet. So, the user should be breathing air of the same density at both locations.

mets123 · Post by **mets123** » Thu Jul 13, 2023 2:59 pm

Agreed Chicagogranny but there must be a reason why this is happening.

ChicagoGranny · Post by **ChicagoGranny** » Thu Jul 13, 2023 3:37 pm

Good point of curiosity. I would like to see the OSCAR Overview chart of TV for the first few days at elevations one and two.

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