Heart rate Series 1,2 vs 3

Discussion in 'Apple Watch' started by iFan83, Sep 16, 2017.

  1. iFan83 macrumors regular

    Sep 12, 2017
    is there a benefit to the series 3 heart rate sensor to the past gens?
  2. ZebraDude macrumors 65816


    Sep 7, 2014
    Naperville, IL
    my understanding is that they are the same sensor..
  3. Trent0341 macrumors 6502

    Jun 3, 2007
    I was trying to get an answer this earlier today... the best I can tell is that it has been software updates that has improved the accuracy of the HR monitor of the AW over time. I was curious about this too and if there have been hardware improvements that would improve the accuracy (besides improved processing power/efficiency) I would love to know more since I am going from a S0 to a S3.
  4. iFan83 thread starter macrumors regular

    Sep 12, 2017
    similar thing here, I don't own an Apple Watch but thinking of buying one, mostly for the heart rate tracking and notifications so if the heart rate has been improved and offers more benefits to that of series 1, I'll go for series 3 but if not series 1 should cover me. With the heart rate sensors being a bit thicker, I would've thought some changes were done but can't find anything about this.
  5. Trent0341, Sep 16, 2017
    Last edited: Sep 16, 2017

    Trent0341 macrumors 6502

    Jun 3, 2007
    I believe the heart rate sensor is a bit thicker because of the increase internals such as the LTE chip and e-sim. I don't think the fact that it protrudes more has anything to do with a hardware change to the HR sensors.

    Also... from my anecdotal experience the accuracy has improved over time with the series 0.

    I do sprints as part of my running workout. When I first got the AW I started getting max HR readings of almost 220. This obviously caused me some concern so I booked an appointment with my doctor and had an EKG. According to the EKG everything was fine. So next I bought a Wahoo Tickr X and ran it side by side with the AW. I was still got the extremely high HR occasionally with the AW but was never over 195ish with the Tickr. After the first or second update (don't honestly remember) it never happened again. Now the main issue I have is it being unable to get a reading at all although usually it is during exercises where I bend my wrist (e.g. pushups or dips).
  6. tivoboy macrumors 68040

    May 15, 2005
    If you really want a better sensor for activities, pair the watch with a Rhythm+ forearm band, much more accurate and responsive.

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5 September 16, 2017