Post Number: 131
|Posted on Tuesday, October 16, 2007 - 12:57 pm: |
see more ideas on other threads.
Here just a very interesting observation from or during yesterday's testing.
1. I did a comparison between the respiratory frequency measured by a flow meter we use in the VO2 testing with Fit mate and parallel to it I added the bio harness.
The heart rate sensor in Polar and Bio harness are absolutely identical with the Bio harness somewhat more sensitive to changes with very high impact . like you may get in a hockey game , but still showing the same heart rate per minutes , but you can see, the " impact" on the print out .
So comparing the breathing frequency we have the following observation .
In resting absolute equal.
Under step test equal numbers as long you breath controlled.
Now comes the interesting part.
As soon you push harder and you start getting tired the Fit mate considers any change in air movement directions as a breath .
so you move 60 liter and you have a frequency of 30 breath / min your tidal volume will be calculated as 2 l.
This assuming , that you breath very regular.
Now that's where the big eye opener is with the Bio harness.
During incremental stress test you suddenly see very irregular breathing pattern and you , once aware of it feel it actually , you sneeze short or do a double breath or a very deep expiration forced upon you by the body or a very deep inspiration . which immediately changes the time for one breath and the actual respiratory rate / min. On the fit mate this is not registered , as you don't see it and even a short inspiration or expiration moment is considered as 1 breath.
Now once you start using the screen as a bio feedback you actually can feel and see , what regular breathing is and hwo you very easy loose this "good ' breathing pattern and have a whole set of 4 - 8 breath very shallow or very deep , depending hwo you feel and how CO2 or O2 sat changes and may stimmulate your breathing pattern or demand over this changes.
Once you start breathing in a good frequency you can see HR dropping and even activity level dropping , but more impressive is the increase of O2 intake resp. the drop of FEO2 ( telling you , how much O2 you extract out of the inspiration air . ( Diff. from O2 intake and O2 release. )
Summary : I am surprised , how "uncoordinated the breathing is and how "bad " the breathing pattern is getting in higher intensity and how much I have to concentrate to keep the air properly flowing . ) Similar as I had the first few weeks on a Power crank bike , making a steady effort to pull up the legs and not just letting it flow.
Perhaps there is more in the question , whether we really use the respiratory system properly and whether in a lot of cases it may be a limitation due to lack of proper awareness as well.
If you are a swimmer you may feel it even better. remember the first few times , how you run out of air but actually you had the problem of not getting ride of air , because you try to breath in and out in the short moment you have with your mouth out of the water.
The interesting part now will be to assess certain breathing pattern in different sport . We now have the tool to do this with the Bio harness in real life situation and even outside the lab on a bike or pool or skiing and so on .