marcag wrote:
Andrew Coggan wrote:
marcag wrote:
Hi Dr Coggan,
Is Gross Power Released/Gross Power Absorbed new to WKO4 ?
Is it only for pedals such as the vector ?
Is it correct to say that GPA is power "wasted" ? If I understand it, if you unweighted 100% your GPA would be 0
GPR of 130 GPA of 27 is pretty bad (I think)
Yes, GPR and GPA are new pedaling metrics that I developed for WKO4 (along with kurtotic index (KI) and maximum effective pedal force (MEPF)).
Yes, you have to have a true double-sided powermeter.
No, GPR does not
necessarily represent "wasted" power. Specifically, you could be actively pulling up on the crank, but still be absorbing power because you're stomping down so hard on the other side.
If you'd like to post a screenshot of the Zorro chart from a variable-power ride, I could walk you through the metrics and their interpretation. (Note that due to limitations of the quality of the underlying data, it is generally better to analyze such metrics using scattercharts instead of, e.g., mean values that are readily distorted by extreme outliers).
thanks
I am not sure there is a wide enough range of power levels
Could be wider, perhaps, but still good enough (note that the X axis of the Zorro chart is *single-leg* power).
Anyway, here's what I see:
1) trainer ride, right? If so, that could influence the results and hence interpretation below.
2) you're more of a "masher" that someone who "pedals in circles" (GPA is relatively high compared to GPR, and doesn't decrease as much w/ increasing power as is usually the case).
3) you tend to "push" more w/ your left leg (cloud of points for left GPR looks to be higher than cloud for right GPR) and "punch" more with your right (GPR lower, but KI higher, indicating a more peaked power-releasing phase).
4) probably because you "punch" the right pedal a bit more, you absorb a little more power on the left side.
So, could you go faster if you modified your pedal stroke? I think that's doubtful...but presumably this chart/analysis has given you better insight into how you actually do pedal, and should you, e.g., develop an overuse injury in the future (and/or have been injured in the past), might be helpful in getting things squared away (ha ha!) again.