Here a great example how different ideas can be applied but perhaps a combination may bring us even further.
Here a nice example form a super interesting web site and concept Golden cheetah , which actually allows you to take MOXY data' s as well.
Here a part of the discussion.
Hi guys, I have a question about best interval calculation on GC.
Sunday I dide an hard climb pushing 258w medium for 30:30, it was my best year effort for this duration.
In the activity page I see a best 30-min value of only 255w, anche looking at my 2015 CP curve my best 30min is 255w too.
I know it's not an important difference but I looks strange...
which could be the problem?
I noticed the same behavior for average power of the automatically detected peak power intervals, there can be a difference of a few watts. For running the differences can be more substantial; on my last run I had a 45 min peak pace of 6:26 min/km, while it actually is 5:58 min/km. Annoying as the first value gets displayed in the Trends charts as well
Now you see the two worlds. I would be more interested in what happened in the 258 load and why I was able to push that or what was the reason for not pushing more.
Was it a delivery limitation and if , what limiter ,or was it a utilization limitation.
So less interested in the 258 wattage.
Now how accurate are wattage and how much fluctuation. Really not an issue as long your wattage meter makes always the same mistake and it is repeatable. So in this case I would love to use wattage and see, by what performance I create what reactions.
So combination of two interesting ideas may create a very improved outcome in how my workouts may be designed and in the understanding why 200 watt today may be a different physiological stimuli tomorrow.