My testing was done using a Garmin HRM-11 chest strap (the original old style supplied with the Forerunner series units) paired with a Garmin Edge 500. The MioLink was paired with the TrainerRoad indoor cycling application running on a PC. Both tracks were recorded using the ANT+ protocol.
At the beginning of the activity the MioLink was intentionally moved on my wrist (Link was worn on left wrist) to create a "break" in the HR track for further positive identification of the MioLink's track. As the graph above shows... after about one minute the tracks began to match fairly well and continued to do so throughout the activity.
Overall I would consider the results to be very respectable if you are using the HRM1 as the "standard" the MioLink should match. Critical users will not that certainly, it’s not a perfect fit.
But personally I really believe power is the ultimate precision training tool anyway. Heart rate is only a rough indicator of how hard I’m working because there are so many variables that can affect it. But power is power, whether you like the numbers on any given day or not.
However as a supplement to power (or when riding a bike/wo a meter) I think overall the Link would appear to do a decent job. Over the course of a long ride I really don’t feel the need for second to second correlation of heart rate with another device.
I think ultimately it would boil down to a decision about whether you want to wear the strap or not. And there are probably times I still would… like for longer events. If anything battery life is the biggest reservation I have about using the Link.
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