Max sampling rate of heart rate sensor of Ionic?

[HumanComputer]

As i go through the codes from the sdk-hr-meter example from https://github.com/Fitbit/sdk-hr-meter/blob/master/app/index.js

It is updating the screen with a rate of 2Hz (0.5s), may i infer that the max heart rate sampling rate from HeartRateSensor() API of Ionic/Fitbit Os will be also 2Hz? Can you controll the sampling rate with the API? What's the max sampling rate i can get from this api?

[HumanComputer]

Just find the Sensors API doc: https://dev.fitbit.com/guides/sensors/heart-rate/ and https://dev.fitbit.com/reference/device-api/sensors/#sensorreading , which indicates a reading of hr with 10Hz or 30Hz also possible, but still it would be great to know what's the limit of the sensor hardware of Ionic.

[Bond-JamesBond]

Does anyone know what type of Heart Rate data comes through the Sensors API? Is it averaged/ aggregated Heart Rate, Beat-to-Beat Interval (RRi or BBi) displaying the time between each successive heart beat, or something else?

Any samples of the data would be fantastic to see!?

[allyann]

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@Bond-JamesBond wrote:

Does anyone know what type of Heart Rate data comes through the Sensors API? Is it averaged/ aggregated Heart Rate, Beat-to-Beat Interval (RRi or BBi) displaying the time between each successive heart beat, or something else?

Any samples of the data would be fantastic to see!?

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I would like to know this too. Has anyone got an answer?

[Colinm39]

A little late seeing this but here is an example of what I download from a 3rd party source for one minute of my sleeping from my Ionic.  Over 24 hours it averages 24 HR points/minute.  Typical 35000 plots/day

[dragonBTV]

According to my experience, higher rate of grabbing heart rate is helpless and even with side effects of in inaccurate read out and power consumption.

I even experience hardware or firmware level failure during my test while grabbing data on brust mode. (which was already deleted under current firmware)

I end up with these way to balance the accuracy, power consumption and response:

  start up the default heart rate call back
  average every 20 seconds as current output
  but double confirm of all read out which is 30% changed by second and third reading

I am to release my app named Heartbeat after power comsumption test under coming Ionic firmware upgrade.

hope it helps

[allyann]

I would like the ability to capture every heart beat in a sample size of say five mintues. I would then be looking at time (ms) between beats to calculate Heart Rate Variability HRV

[Mark2018]

Can HRV shown with real time data?

Thanks.

[ccyoh]

For those looking to measure heart rate variability (HRV) I just uploaded eHeart Rate Variability clockface to the gallery.  It calculates SDRR (not SDNN  because it doesn't filter abnormal beats), RMSSD, and pNN50 in real-time in 1 minute increments.  It is based on HR in place of RR intervals which is not ideal. 

To Fitbit: is there a way to access RR intervals?

[ccyoh]

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@Mark2018 wrote:

Can HRV shown with real time data?

Thanks.

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For those looking to measure heart rate variability (HRV) I just uploaded eHeart Rate Variability clockface to the gallery.  It calculates SDRR (not SDNN  because it doesn't filter abnormal beats), RMSSD, and pNN50 in real-time in 1 minute increments.  It is based on HR in place of RR intervals which is not ideal. 

To Fitbit: is there a way to access RR intervals?

[FitPaulaP]

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@dragonBTV wrote:

According to my experience, higher rate of grabbing heart rate is helpless and even with side effects of in inaccurate read out and power consumption.

I even experience hardware or firmware level failure during my test while grabbing data on brust mode. (which was already deleted under current firmware)

I end up with these way to balance the accuracy, power consumption and response:

  start up the default heart rate call back
  average every 20 seconds as current output
  but double confirm of all read out which is 30% changed by second and third reading

I am to release my app named Heartbeat after power comsumption test under coming Ionic firmware upgrade.

hope it helps

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@dragonBTV Are you using the batch mode or have you set a timeout/interval to sample every 20 seconds? I am trying to get one HR reading per minute, and the min frequency that it seems I can set it to is 1, as in once per second (https://dev.fitbit.com/build/reference/device-api/sensors/#interface-sensoroptions). 

Thanks in advance for sharing!