In my experience HR has a very loose correlation to power and that is about it. I have a background in data science and for fun a few months ago I spent some time trying to build a model to use my heart rate data to predict my power. Despite adding in data points for temperature, time of day, estimated fatigue, etc. the closest my model could come was +/- 10%. I no longer give any merit to heart rate data. I still collect it because I’m a dork and who knows when I’ll want to make a spreadsheet, but it has zero input on my training.
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