(05-24-2014, 03:11 PM)justMongo Wrote: Ever heard the saying, "If it ain't broke, don't fix it." Your numbers fall into that category.
I agree with justMongo here: If it ain't broke, don't fix it.
So rather than focusing on your excellent
therapy numbers, you need to be asking yourself: How do you feel when you wake up? And how do you feel throughout the day?
If you are NOT yet feeling as well as you hoped, it's time to consider other
(05-24-2014, 03:23 PM)Marnid2014 Wrote:
(05-24-2014, 03:11 PM)justMongo Wrote: You say you breath shallow. Most people do during sleep. The Tidal Volume is a measure of how shallow.
There's a range of what normal TV is. Around 500 ml is normal.
These are the stats from last night, the tidal volume is low, is this ok?
Channel Min Med 95% Max
Tidal VolumeTidal Volume (ml)
W-Avg: 284.44 60.00 260.00 480.00 820.00
Tidal volume depends on the person (size is important!) and whether you're talking about WAKE breathing or SLEEP breathing.
Normal WAKE, but resting TV for a typical adult is approximately 500 mL per inspiration or 7 mL/kg of body mass. So that 500 mL "average TV" is based on an average weight of 71.43 Kg = 157.48 pounds. But there is quite a bit of variance on the numbers considered "normal" in the population.
In normal SLEEP breathing, the TV does go down, sometimes substantially. According to this research paper in Thorax
the TV in REM sleep is often only 73-80% of what the resting wake TV is. The sleep TV is also lower than the wake TV in all other stages of sleep as well, often is 10-20% lower than the WAKE, but resting TV. And in most normal people, the SLEEP breathing is substantially shallower than their normal WAKE breathing.
If you weigh substantially less than 150 pounds, your tidal volume numbers are going to be far less: Take my own situation: I'm 5'1" tall and weigh about 105-110 pounds. And 110 pounds = 49.90 kg. So my WAKE, but resting average TV should be around 49.9 * 7 = 349.3 mL (call it 350 mL). My weighted average and median sleep TV (as measured by SH's computations) are both usually in the 280-300 mL range, which is 80%-86% of my expected WAKE, but resting TV.
In light of all this: Your median and weighted average TV may indeed be a bit on the low side, particularly if you weigh a lot. But it could just be that these numbers are normal for you. And if you are feeling decent when you wake up and decent during the daytime, I would assume that your TV numbers are "normal for you".