I was down to 90-100 within a few minutes of getting home, then took Little Scouse down to the park.
I'll try to check my rest heart rate tomorrow morning.
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You don't have a wireless cycle computer that could be interfering with it.
Just noticed your HRM thread, I would say the crane sports one would be an older style analog HRM which were not that reliable when it came to interference from other electrical devices or static electricity.
I have a cycle computer but it's not a wireless type. I'll leave it off for Monday's ride & see what difference it makes.