How long to acquire heart rate?

Discussion in 'Apple Watch' started by skimcpip, Jun 2, 2015.

  1. skimcpip macrumors regular

    Aug 28, 2013
    How long does it take your watch to acquire heart rate? I'm trying to figure out if mine is defective. Is it instant or can it take up to 10-20 seconds?
  2. AppleWes macrumors 6502


    Oct 9, 2013
    I think that's a normal amount of time. Mine seems to take at least 10 seconds or longer too sometimes.
  3. zmunkz macrumors 6502a


    Nov 4, 2007
    The normal behavior is 10-20 seconds, which in my opinion makes it "effectively defective" as a useful feature, but it is what it is, at least for now. I almost never get the HR to show before the screen shuts off. Very agitating.
  4. Mike Delta macrumors 6502

    Mike Delta

    Sep 12, 2014
  5. Smurphy Gherkin macrumors 6502

    Apr 13, 2015
    Melbourne, Australia
    18 to 19 seconds every time I have ever timed it.
  6. papbot macrumors 6502

    May 19, 2015
    I work with pulse oximeters in a hospital. They register your heart rate as well as oxygen saturation. Even on them it can take 10 seconds or more, depending on peripheral circulation and condition of the finger tips, to display an accurate heart rate. These are measuring at the nail bed of your fingertip where your circulation is the most superficial. So it wouldn't be possible for the watch to do it any faster from the top of your wrist where it's not even in the vicinity of an artery. What you're describing is to be expected and sounds perfectly normal to me.

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5 June 2, 2015