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From Fellrnr.com, Running tips
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* '''Intensity minutes'''. It's not clear how Garmin calculates "intensity minutes", but it seems to use heart rate to determine intensity, with high levels of intensity counting as a multiplier on the actual number of minutes. I've seen some strange discrepancy in intensity minutes when using the optical heart rate monitor, which is not surprising given the accuracy issues. I suspect that changes in the heart rate zone also impact intensity minutes, but the lack of transparency in this calculation makes it hard to evaluate.
* '''Sleep'''. The estimation of sleep can be a little flaky on occasions, but overall it seems to do a reasonable job. It's hard to verify the estimation of sleep, other than checking if the bedtime and rising time seem reasonable. I'm not convinced by the Garmin estimate of how much deep and light sleep you are getting, and I tend to ignore that information as suspect. I have noticed that changing time zone can really mess up the sleep calculation, but hopefully Garmin will resolve this at some point.
* '''Resting Heart Rate'''. It seems that Garmin looks for uses two methods of detecting resting heart rate. If you wear the watch overnight with the OHRM enabled, it will be the lowest heart rate it sees while you're awakeasleep. If not, using its sleep detection to ignore heart rate then it will be the lowest one minute average it sees during that time. That closely matches the medical definition of resting heart rateday. The value it records seems a little higher than I would expect, and I've seen some discrepancies when I'm wearing the Garmin 935 and the Fenix 5X concurrently. I keep an eye on the reported resting heart rate, as this is a potential red flag for [[Overtraining]] or other health problems, but I'd only be concerned if I see a consistent rise over several days.
* '''Move IQ'''. Garmin will estimate when you're performing an activity even if you've not explicitly recorded it. So, if I walk the dog, which I don't add to my training log, Garmin will automatically detect this as an activity.
* '''Feedback'''. The area where Garmin really shines as an activity tracker is the feedback and inspiration that they provide. The [[Connect IQ]] watch faces can provide an overview of your weekly activity and how today is comparing with other days, which I find is a good way of motivating myself to get moving. Watch faces also provide a progress bar for how close you are to your daily step goal, though I wish that they'd implement some way of seeing your continued progress after you've hit the goal. Some days I can reach several times in my minimum goal, and it would be nice to see this visually. There are also a number of firework displays the watch gives when you hit your goal. These little firework displays could be considered cheesy or annoying, but I found over time that I really appreciate the little bit of positive feedback. You can also get more information on your activity by scrolling through the widgets on the watch, as well as a vast array of information and visualization on both the Garmin Connect smart phone app and their website.
