The first of many writings on running power meters, this one posted at TrainingPeaks....
Running With Power: How to Find Your Run FTP
If you are now currently using a power meter for running, like the new Stryd or RPM2 products, you likely are wondering how you can utilize the tool to maximize the benefit of the technology in your training and racing. Power meters for running are a very new technology, and there is still a lot to learn ahead. However, to begin using it effectively to learn about your training and training response, you should begin as you would if you were using a cycling power meter.
The first thing you should be doing is simply performing your normal training and observe the data as you train. Track the data and see how the numbers fluctuate or correlate with different intensities, different inclines or declines, and more. Don’t try to control your training based on the power numbers, as you don’t have a baseline for what they truly mean yet. At first, collect the data from your normal training and see how the numbers are trending.
When you feel you are ready, you can then test for your run Functional Threshold Power (FTP). Now, if you’re a triathlete who uses power on the bike, this number will not likely be the same as on the bike for you. In fact, it is likely larger than your cycling FTP. So don’t try to use that value. Be specific and set your run functional threshold for power, or what I call, rFTPw. If you’re a runner, you likely already use threshold pace in TrainingPeaks, or what I call rFTPa. I use these terms so not to confuse them with cycling, and especially not to confuse both pace and power when comparing or discussing FTP.
You can read the rest here:
You can also find more info on my book on power meters for running, at www.runwithpower.net