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Those error bars are too wide for the formula to be useful for training based on heart rate percentages.

I've already said that I have found it to be useful:

https://news.ycombinator.com/item?id=43083815

:so please explain why I haven't :-)

You are doing nothing that requires the formula to be precise. A 10bpm standard error, meaning the max is very possibly 20bm off where you think it is, means that you can't reliably distinguish between efforts that someone doing serious training would want to be distinguished.

> You are doing nothing that requires the formula to be precise.

Exactly.

My guess is that neither are most other readers and commenters here. (Any evidence to the contrary?)

Meanwhile, what do those error bars tell use about "training based on heart rate percentages." :-)

> someone doing serious training

Care to say what you mean?

Reply on news.ycombinator.com