How long does it take the heart rate sensor to detect heartbeat?

Discussion in 'Apple Watch' started by KOH, May 6, 2015.

  1. KOH macrumors member

    Apr 11, 2015
    It takes mines about a good 18-20 seconds to get my heart rate from glances.
    Seems a bit slow no?
  2. susan12369 macrumors 6502

    Apr 20, 2015
    When I go to see it in glances, it takes about 2 seconds before it starts saying "measuring..." and then it takes about 15 seconds before it's displayed. Since it is measuring beats per minute, I assume it needs some time to calculate the current HR.
  3. maricc macrumors regular

    Oct 13, 2011
    Yes agreed. Longer than I would have guessed.
  4. AtheistP3ace macrumors 6502a


    Sep 17, 2014
    Yes about 15 secs or so for me. I thought it would be faster.
  5. mrboba1, May 6, 2015
    Last edited: May 6, 2015

    mrboba1 macrumors regular

    Apr 24, 2015
    Raleigh, NC
    How long does a CNA take to check your pulse?

    (I'll tell you - it's a minimum of 15 seconds, but usually 30, and they multiply by 2 (or 4))
  6. zlin9596 macrumors member

    Oct 24, 2010
    i feel like auto checking heart rate is kind of off to the normal open glance and check. how are your measurements?
  7. greytmom macrumors 68040


    Jun 23, 2010
    About 15 seconds sounds about right... you need at least that long to get a heart rate that makes sense.
  8. bjdraw macrumors 6502a

    Jan 24, 2008
    Tampa FL
    When using the workout app, it samples the HR every 5 seconds. My Mio LINK optical wrist HR monitor samples every second. If I have my Mio Link paired with my Watch the HR glance updates instantly.
  9. andrewj macrumors regular

    Sep 4, 2008
    Agreed, it takes longer than it I would expect.
  10. tivoboy macrumors 68040

    May 15, 2005

    yeah, its between about 18-20 seconds, and I think it's probably trying to hit 20 seconds since that would be an easier BPM cal to do..HR recorded X 3..

    Probably gives a better reading than one that does it faster.
  11. maliu macrumors 6502a

    Jun 24, 2010
    As a nurse, I usually count for 15 seconds, but if it's irregular I go a full minute. It takes time. Relax.
  12. lchlch macrumors 6502a

    Mar 12, 2015
  13. Lloydbm41 Suspended


    Oct 17, 2013
    Central California
    I have just done 7 back to back samples of my Moto 360 heart rate via Google Fit and compared it to my very accurate Reebok chest strap HR monitor.

    All 7 samples averaged out to between 20 and 27 seconds. All 7 samples were within 1-2 beats of my chest strap monitor. While I do not have an Apple Watch to do this with, I would say that 15-20 seconds on the Apple Watch is actually slightly quicker than the competitors.

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