kbre93

7 ms·

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Show HN: Every Step You Take – Weekly Insights from Your iPhone Step Data(github.com)
1 points by kbre93 2y ago|0 comments
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by kbre93 2y ago
Atrial Fibrillation (AF) is the most common serious heart arrthymia, affecting around 30 million people worldwide. People with AF have a 4 times higher risk of mortality and 5 times higher risk of stroke than the normal population. I'v
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Show HN: Interoception – Know your heart with the Polar H10 heart rate monitor(github.com)
2 points by kbre93 3y ago|0 comments
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by kbre93 3y ago
Hi stenmorten try going into Settings > Privacy & Security > Bluetooth, and adding your terminal application or development environment to the list of applications that are allowed to use Bluetooth
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by kbre93 3y ago
This should be fixed now. Let me know if you still have issues
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by kbre93 3y ago
This should be fixed now. Let me know if you still have issues
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by kbre93 3y ago
The blue circle is your chest expansions and so when it follows the gold circle you’re controlling your breathing well. Good hrv is above 150 ms and is shown as a green band on the bottom graph
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by kbre93 3y ago
Thanks ar-jan I’ve merged those and I think the Bluetooth issues are related to security permissions
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by kbre93 3y ago
Yes basically, I remove the gravity component by high pass filtering, and then take just the component of acceleration which is along the axis of chest expansion (i.e. pointing out from the sensor) off the top of my head this is the z axis.
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by kbre93 3y ago
Very nice, yeah the Polar H10 sends raw ECG, as well as the calculated heart rate, so could be what you're looking for.
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by kbre93 3y ago
I'm glad
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by kbre93 3y ago
It currently only works with a Polar H10, which has a heart rate monitoring (ECG) and an accelerometer (for measuring breathing rate through chest expansion)
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by kbre93 3y ago
Right, but I don't think they measure it directly (could be wrong), I think they measure it based on change in heart rate
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by kbre93 3y ago
Interesting, thanks for sharing, it looks like it has similar core sensors to the Polar H10, but I'm not sure how it compares overall
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by kbre93 3y ago
That article is referring to the internal memory that the Polar H10 has, which can be used to store some data. But you will eventually need to connect the device to retrieve that data. You can access this data programatically with a blue-to
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by kbre93 3y ago
This would be possible I with the Polar H10 I think. The H10 sends raw ECG and analysis on this waveform could be used to find anomalies like afib. I haven't done this myself though.
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by kbre93 3y ago
This is measured over a very short time scale though – so not a persons absolute max and min heart rate, just how it varies over a few seconds. And yes, higher HRV is generally healthier and points to a better balance between the fight-and-
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by kbre93 3y ago
No, this is just for biofeedback training, so just for a session once a day
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by kbre93 3y ago
Yep that's right, and the H10 is able to stream the ECG waveform. For this project I used the inter-beat-interval that is sent however, as it means I don't have to run peak detection on the ECG to get heart rate.
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by kbre93 3y ago
The H10 is a newer and better version of the H7. Because breathing rate is measured from chest expansion that is pretty easy to verify (there can be noise in the estimate of course due to movement artefacts). Heart rate estimation from the
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by kbre93 3y ago
Yes it's common to estimate breathing rate based on the oscillations in the heart rate pattern. But estimating it from the chest expansion is a more direct method
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by kbre93 3y ago
Interesting, thanks for sharing. It's cool they do it as a platform, but I'm not sure what the benefit over using a Polar H10 would be, which are widely available, I guess it would be custom branding of the hardware
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by kbre93 3y ago
I think most bluetooth low energy devices can be connected to quite easily programmatically as long as you know the data specification. Polar use to publish their data spec on their website but took it down a few years ago so I had to searc
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by kbre93 3y ago
What's your os? Only been test on macOS so far
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by kbre93 3y ago
Yep it's via bluetooth
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by kbre93 3y ago
I've it's quite common for fitness trackers to predict the onset of sickness from heart rate variability. I've found they don't offer much real-time feedback, and don't have breathing detection though which was what
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by kbre93 3y ago
Yep it's taking the difference between peaks and troughs in heart rate, for plotting with the breathing rate it looks at the min and max over the breathing cycle.
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by kbre93 3y ago
Hey no worries and thanks. It was a break-through for this project to find the H10 gives accelerometer data as well as heart rate, so that it would be possible to estimate breathing rate, which I haven't seen other apps do
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by kbre93 3y ago
As you breath more slowly, heart rate oscillations (i.e. the variability) increase, which is a reflection of the parasympathetic nervous system activating (the "rest and digest" response). This can help to mediate the stress respo
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by kbre93 3y ago
Thanks, I've personally found benefits from being to learn to control my breathing in stressful situations. Right now it only works with the Polar H10, but it would be possible to adapt it if other chest strap monitors have an acceler

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