Not an intervals.icu question per se, but someone might be able to shed some light on this for me.
I did a VO2 session. Assioma Duo pedals. Garmin Dual HRM.
Both the PM and the HRM were connected to a Wahoo computer and a Garmin watch.
The data output from each of the Wahoo and Garmin has some differences.
1 - Max power according to Wahoo is 407w, but is 434w according to the Garmin.
2 - Minor differences in average power for the intervals also (a watt or two only for interval averages but Garmin once again reporting higher power.)
How and why does the data differ on each device? Which should be trusted? Wahoo or Garmin?
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I’ve seen small differences between Garmin devices.
Are both set to 1s recording?
Ya. Both set to 1s record. Well the Garmin definitely is… The Wahoo is the Bolt V1. Think that’s auto set to 1s record.
27 watts is a lot though in Max output.
I don’t understand how they both receive the same data but output different results
It may have to do with the specific recording time/method. The sensors provide data multiple times a second, but the devices record only every second. They can either average everything they receive between writes, or take a single value just before write.
If the single point in time is offset by milliseconds between two devices, you could see disparity.
If the number of received values is different (different radio polling frequency) , you could see disparity.
It usually shouldn’t be much. But there are certainly reasons for it to not line up.
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Thank you. Makes perfect sense.