It can be hard to follow an interval workout using a heart rate monitor alone.
This is because your heart rate takes a few minutes to fully reflect what you're actually doing. It's the same for everyone. For example you might push to a high power output, but your heart rate will remain low for until it builds up to reflect your current intensity. And vice versa.
For this reason, heart rate is great for steady state rides but not so good for interval sessions with frequent changes in intensity. Power output is a better measurements for interval sessions (followed by Rate of Perceived Exertion or RPE).
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