Looks like a reasonable proposition. Might drive prices of other single-sided meters down – hello Vector.
I’ve been playing with power, HR and the relationship between the two, based on British Cycling training zones. For my personal 20 minute threshold heart rate and power there is a pretty good relationship between zone boundaries:
Power = 2.2 x HR – 100
Of course this assumes steady-state efforts (unlike the Powercal) but is good enough for me to set the Heart Rate Zones in the Garmin so that the graph of Heart Rate can now tell me which power zone I’m in. Until Garmin add a Power graph, of course. Validity is up to Zone 5, as all out efforts are obviously off the scale, but you can feel that anyway.
That HR graph is fantastic, I’ll show how I did it on another thread. If you haven’t discovered it yet, it will open up a whole new view of dynamic training – so much better than just telling you a number. And you’ll see HR change reasonably quickly after effort. Well mine does, YHRMV.
Not mine but here is the graph showing zones. My display shows Instant HR, 30 second Power and Cadence (I ride fixed wheel so this is also related to speed and HR)