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One of the primary benefits of training is likely to be improving running economy, so that you can run faster for the same oxygen consumption. Running economy varies significantly between different runners, which means that running power output would vary for a given oxygen consumption between runners. If a running power meter was actually measuring oxygen consumption, then this would be a way of measuring running economy, but that's an equally flawed idea.
==Comparisons Between Running Power and V̇O2max==
Below is a graph from the book "The Secret Of Running", which compares power output and V̇O<sub>2.</sub> It's claiming that this shows "the stride data I just as good as the V̇O<sub>2</sub>." However, this only shows that the [[Stryd]] estimate of power varies linearly with pace, which given pace is a primary input to power estimate should come as no surprise. It also shows that oxygen consumption is also linear with pace, something that is well known. However, the power estimate for a given oxygen consumption varies dramatically. You can see for 40 ml/Kg/min, the estimate varies from 2.5 w/Kg to 4.0 w/Kg, a nearly 40% variation. See [https://hetgeheimvanhardlopen.nl/wp-content/uploads/2016/11/3-The-running-economy-of-14-test-runners.pdf] for more details.[[File:StrydVo2.png|center|thumb|300px|Data from "The Secret Of Running" book.]]Stryd have released their own evaluation at [https://storage.googleapis.com/stryd_static_assets/stryd-metric-validation.pdf]. Their data shows "Stryd power is 96% correlated with metabolic energy expenditure", but the study was on 13 runners and the correlation is only a subset of 9 of them.[[File:StrydVO2-2.jpg|center|thumb|300px|Data from an evaluation performed by [[Stryd]].]]
=Differences Between Running and Cycling Power Meters=
Power meters have become an integral part of training for cyclists, and a number of running [[Running Sensors]] claim to have similar benefits for runners. Let's look at the differences between power for cycling and running.