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From Fellrnr.com, Running tips
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I'm still testing GRP, but here are my initial thoughts.
* Getting your running pace from GPS is fairly useless, so it's not surprising that GRP's power estimate when using GPS as the speed source is pretty worthless. I typically see power estimates fluctuating by +/- 50 watts when maintaining an even effort.
* When I use [[Stryd]] as a Footpod to provide current pace, GRP provides a much better power estimate. I'm still gathering data, and I'll update this page with the results.
* I've not tested GRP with a Garmin Footpod, but this might be a more cost-effective approach then using Stryd. Of course, it will also require a lot more effort in terms of regularly recalibrating the Footpod, something you don't have to do with Stryd.
* The GRP estimate of power is much higher than the estimate I get from Stryd. Garmin [https://support.garmin.com/faqSearch/en-US/faq/content/vAzl2ne5dV6diuc2XbYZA6 claim that running power should be higher than cycling power for a given effort based on a number of research papers]. I'm still analyzing this research.* Because GRP is a Connect IQ data field, you can have it concurrently with the Stryd data field. Neither of them will record it to the standard power track in an FIT file, which means they both require some software support. Golden Cheetah supports Stryd power track natively, but doesn't yet support GRP.
