I just did some tests again with my pulse oximeter and 30-40s delay until the %SpO2 value changes seems about right here as well. I think this is (mainly) from measuring at a finger and how circulation works.
This was a super spontaneous shoot I did with Hidero. We're collabing on some somewhat ambitious breathplay ideas atm and I wanted to test the viability of Spo2 sensors as a safety measure. Then we kinda just decided to film it.
It's interesting that the oximeter readings seem to have a ~40 second delay from my breath changing. Does anyone know if that's an issue with this cheap sensor? Due to circulation? A delay in oxygen getting from my lungs into my blood?
I have a relatively cheap "iChoice" that I bought off Amazon several years ago, but I've never 'stress tested' it like that. I know the HR on mine is fairly consistent with more expensive devices (like my Withings BP cuff), but I can't speak for the in/consistency, in/accuracy, or feedback delays of the oximeter part.
@pockets I suspect that the delay is mostly caused by my body, but I wouldn't be surprised if the sensor had a ~10 second delay. I think it does some averaging to smooth out fluctuations. After putting it on, it takes about 10 seconds before it gives the first reading.
@Bubu At least with this specific sensor, I think it's probably too delayed and too noisy to use as a safety feature. I have a few more ideas to try still though.
I felt fine during the scene, not dizzy or faint. It makes me wonder how far I'd have to push it before passing out.
The sensor can be connected to a phone via Bluetooth. I just screen recorded the app.
@Bubu I'm interested in trying the pulse oximeter on my earlobe and seeing if that gives a faster response time. Medical literature is divided about the accuracy of finger vs ear placement, but response time isn't really a high priority in medical settings so I can't find much on that.
Bubu
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Thanks for sharing this!
I just did some tests again with my pulse oximeter and 30-40s delay until the %SpO2 value changes seems about right here as well. I think this is (mainly) from measuring at a finger and how circulation works.
Misofist
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This was a super spontaneous shoot I did with Hidero. We're collabing on some somewhat ambitious breathplay ideas atm and I wanted to test the viability of Spo2 sensors as a safety measure. Then we kinda just decided to film it.
It's interesting that the oximeter readings seem to have a ~40 second delay from my breath changing. Does anyone know if that's an issue with this cheap sensor? Due to circulation? A delay in oxygen getting from my lungs into my blood?
pockets
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Misofist
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pockets
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Misofist
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Bubu
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Bubu
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What was your conclusion re: pulse oximeter as a safety measure?
Also: How did you feel during that scene? I never saw this go anywhere close to 40%SpO2. 😳
Also also: how did you get the data from it for the video?
Misofist
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@Bubu At least with this specific sensor, I think it's probably too delayed and too noisy to use as a safety feature. I have a few more ideas to try still though.
I felt fine during the scene, not dizzy or faint. It makes me wonder how far I'd have to push it before passing out.
The sensor can be connected to a phone via Bluetooth. I just screen recorded the app.
Bubu
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I bought mine with the same idea in mind but also came to this conclusion, then didn't really do a lot with it.
Would be interested in hearing about your other ideas, when you get to trying them.
Misofist
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Misofist
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Bubu
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Misofist
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Bubu
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