15 Mean SaO2
- Beatrix Krause (Unlicensed)
Mean O2 is visible in channel 15 in red. Every two seconds or so (FIND OUT), one sample of skin temperature is measured and visualized. The Y-axis to the right shows the range of mean O2 in percent.
SaO2 is acquired from a pulse oximeter attached to the left thumb and visible in channel 14. Since SaO2 entails fluctuations, a mean signal was computed in order to attain a usable numerical measurement.
Below you see images that show skin temperature instead of mean SaO2. The procedure is the same, just that the channel is different, so replace everything that says “skin temperature” with “mean O2”.
Output data
Select channel 15 (click on the label “15 | mean O2”, click on the border of the focus area, so a vertical cursor line appear at the beginning of the focus area. Then:
Go to Analysis → Find cycle
First tab: Select fixed time intervals and interval width 2 seconds.
Selection tab: this interval range is where the software will compute measurement values from. Select “previous interval” such that the blue markings are intervals, rather than just lines.
Output tab: on the Measurement sub tab, select ‘save measurements into Excel spreadsheet file’ and keep the default of ‘Apply measurement preset’ in the dropdown menu. This means your previously determined measurements of interest will be used and output into excel.
Then click “Find all in focus areas”.
If you have more than one focus area, you can select whether you want all focus areas output into the same file and tab, or into one spreadsheet per focus area. My suggestion is to use a single spreadsheet.
If this warning occurs, click yes:
Let’s say you entered 1-second intervals on the first Find Cycle tab, but the acquisition software can only sample in 2-second intervals, your will receive the following warning. It is definitely important to know your sampling rate, but either way, you will receive the smallest possible sampling intervals this way.
Your output will look like this. Note this is for 3 focus areas (here Stroop), they will be pasted underneath each other.
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