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Intensity minutes not adding up from activities ?

Former Member
Former Member over 4 years ago

I'm doing quite daily a mountain bike routine covering all heart rate zone, in particular in zone 3 and 4. I record it as an activity. Heart rate zone are a % of my max heart rate.

Since last week the intensity minutes do no longer add up, or only sometimes, in the connect app or web app after synchronizing my watch. But time in zones seems correctly appearing per activity when displayed... why not added ...

Is there any recent change in software that carries a bug ?

Also, connect app on web says "Heart Rate Zones: You can have greater control over how intensity minutes are calculated by adjusting which heart rate zones (1-5) are considered moderate or vigorous intensity." but there seems to be absolutely no menu point on Instinct which would allow this. What is vigorous remains undescribed (I guess zone 4 and 5 ?).

Does anybody know how to influence / correct ?

  • 0 over 4 years ago

    Go to garmin connect, tap on the watch icon on top of the app, user settings, heart rate zones and check how they are set up. You can also reset and see if that helps. Make sure to sync the watch after you apply any changes

  • 0 over 4 years ago

    Please share a weblink to the activity where you believe the Intensity Minutes were not correctly calculated, so that we have a look. Please note that in order to earn intensity minutes credit, you must reach or exceed 10 consecutive minutes where your heart rate is elevated above the threshold that is considered moderate intensity. So if the effort was frequently interrupted, and there were only shorter bursts (<10min) in the upper HR zones, then they won't count.

  • Former Member
    0 Former Member over 4 years ago in reply to darnich

    Thanks for your suggestions, that's done (heart rate zone setting is % of max rate), synchronized, reset done. Problem persisted.

  • 0 over 4 years ago in reply to Former Member

    As I wrote: please share a weblink to the activity where you believe the Intensity Minutes were not correctly calculated, so that we can have a look at it, and tell you what could be wrong. 

  • Former Member
    0 Former Member over 4 years ago in reply to trux

    Hello trux, thanks for your answer. The typical activity has some 20 to 40 minutes in each zone. I give here a link example activity done earlier today.

    Result after synchronizing is unforeseen in that I see  now 11 (eleven) intensity minutes in connect app for today while time spent in zone 4 was 29 min and in zone 3 for 12min45s according to the activity. Hmmm.... better than no counting at all but still room for improvement.

    Another observation : while saving  the accomplished activity on the watch, a short 'failed' message was displayed on the watch. Anyhow, it would proceed and display as usual, and upload to connect app did work as well.

  • 0 over 4 years ago in reply to Former Member

    Indeed, the HR graph shows 25 consecuitve minutes in the Z4, so that should be sufficient for some IMs.

    Another observation : while saving  the accomplished activity on the watch, a short 'failed' message was displayed on the watch.

    That may be the reason. Verify how much free space is remaining on the device storage (over the USB cable). Delete old activities from the folder //GARMIN/Activity, and also unneeded workouts and courses.

  • 0 over 4 years ago in reply to trux

    ... another possibility that could be the reason, is your Max HR and especially your Resting HR for given days. They play important role for the IM calculation. Please go to the Reports page and have a look at the reports Resting Heart Rate and Max Heart Rate. Compare the values for the day you got high IM, and the other day you got low IM.

  • Former Member
    0 Former Member over 4 years ago in reply to trux

    ...thanks  trux,I will try to free up space on the watch and tell here what happens.

    But why is the daily Resting Heart Rate in the equation ? The available documentation explains that % of Max Heart Rate is the criteria, and that is exactly what I need when I wear the watch only during my activities and not during my office hours or at night. If there is any more knowledge about how exactly the watch operates it would be interesting.

  • 0 over 4 years ago in reply to Former Member
    The available documentation explains that % of Max Heart Rate is the criteria

    No, the available documentation (for example the document How Does the Intensity Minutes Feature Work on My Garmin Watch?) tell this:

    "Most devices with wrist-based heart rate senors will calculate intensity minutes by comparing your current heart rate to your average resting heart rate"

    So if you wear the watch for activities only, you will never have accurate IM. The Resting HR is used also for other features of the watch, so the lack of it will influence also other functionality, including possibly also the Calories calculation.

  • 0 over 4 years ago

    This started to happen to me a couple of weeks ago. 

    I used to gain a lot of Moderate Intensity minutes throughout the week from daily walking, and manual work, now I only ever seem to gain Vigorous Intensity minutes when I go running. 

    I also find the heart rate monitor okay for running, but for anything else, it performs poorly. I can be out of breathe, sweating and My heart can be beating through my chest, and I will look at the heart rate graph and its only in the 80's.