Calories burned and HR dropping down over time ...

Discussion in 'Apple Watch' started by TDHawks, Feb 28, 2018.

  1. TDHawks macrumors newbie

    Jan 7, 2018
    Here is what I mean - Over the past 2 weeks, my HR is considerably lower and my calories burnt are way down. Now, I have not turned into an elite endurance athlete where the readings could be justified.

    I play tennis and my HR will vary. For the past 6 weeks I average close to 1000 calories per 1.5-2 hour session. HR in the fat burning to cardio zone, roughly 65-85% for most of the sessions.

    The past coupe weeks I am only registering close to 600 calories and my HR is consistently is the warm up zone, 60% of max HR.

    Any idea why the sudden change?

    I have used the stock app, and two different third party apps and they all are doing the same thing.
  2. ftaok macrumors 603


    Jan 23, 2002
    East Coast
    Here's a couple of thoughts.

    1. You're getting in better shape and therefore your HR readings are truly lower now.
    2. You've gotten better at tennis, so you're running around less.
    3. You're playing less skilled players and do not have to run around as much.
    4. You're not trying as hard as you were previously.

    Some other things to check.

    a. Make sure your height, age, and weight are correct on the AW, iPhone, and any 3rd party app you're using. Age and weight can change where your HR zones are located. Weight will affect your calories burned. While you're at it, make sure your setting for gender hasn't changed either.

    b. If you have readings in your VO2max, check to see if it's significantly improved. That could help determine #1 above.

  3. jeyf macrumors 65816

    Jan 20, 2009
    your your wallet is much lighter now after buying the apple watch

    apple did sponser a white papaer how the watch will detect prevent heart disease. go figure:rolleyes:
  4. TDHawks thread starter macrumors newbie

    Jan 7, 2018
    I have never seen the VO2Max register on my health app. I use HITT stock workout in the gym, but rarely use the stock "other" for tennis as that algorithm is based off a brisk walk and not realistic for tennis. I will have to look into that when I get a minute.

    I get what you are saying in the top section and to a small degree could play a part, but not as drastic as what I am seeing for readings.
  5. Newtons Apple macrumors Core

    Newtons Apple

    Mar 12, 2014
    Jacksonville, Florida
    If you HR is not being tracked correctly it will show less calories being burnt. One depends on the other.
  6. TDHawks thread starter macrumors newbie

    Jan 7, 2018
    Correct. Maybe after the update I did last night it'll work different today. We shall see.
  7. Newtons Apple macrumors Core

    Newtons Apple

    Mar 12, 2014
    Jacksonville, Florida
    When you look at your HR while in a work out or game, how much lower is it that what you are used to seeing. Maybe the last AW update changed things.
  8. Julien macrumors G4


    Jun 30, 2007
    You will only get a VO2 Max reading if you do a Run or (very brisk if slightly de-conditioned) Walk Activity. As pointed out with tennis there are just too many variables plus it is not a true cardio exercise further complicating comparisons. In order to compare if you fitness level is changing you would ned to do some some base line cardio exercises and then do this agin and compare. A great one would be something like a 5K run on a treadmill. This way you can control the speed and there would be FEW if any variables.

    Also if you are not using Other in tennis what are you using?
  9. TDHawks thread starter macrumors newbie

    Jan 7, 2018
    Makes sense. Thanks.

    I am using an app called Zones for Training. It breaks down your HR into each zone based off your heart rate so you can calculate your zones for better training. I mainly use it for tennis as I use the stock HIIT for most of my gym workouts.

    I tried the "other" option when playing tennis a few weeks back and results were a good amount less than the Zones app all within the same week. Granted, it's one algorithm vs another. I found online that the "other" algorithm is based off a brisk walk. Not sure if that's true or not? That's why I generally use the Zones app.
  10. Resqu2 macrumors 6502a

    Apr 23, 2011
    My vo2 shows up every day but I do run every day. My resting HR is now in the low 40ties but that took a long hard year to do that. I keep a check on accuracy by wearing a chest strap on some runs. The watch is very accurate from what I’m seeing. I’d physically take your resting HR several times during the day and compare to what the watch says.
  11. kevo0822 macrumors 6502

    Jul 13, 2007
    New England
  12. BasicGreatGuy Contributor


    Sep 21, 2012
    In the middle of several books.
    How are you calculating your target heart rate zone? If your reply is taking what you think your max heart rate is minus your age, that number is not accurate.
  13. TDHawks thread starter macrumors newbie

    Jan 7, 2018

    I use the Karvonen Method after determining my MHR.

    But that is not the point of what I am trying to figure out. I am just curious why the drop so suddenly. Figured it was mostly software related.

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12 February 28, 2018