Rhr 80-90 should I be concerned

It could have been dehydration maybe.

I was dehydrated yesterday morning working outside, my blood pressure dropped and my heart rate was at 100 bpm rested.
I drank pedolyte with 16 oz of water then drank more than normal the rest of the day and was fine a couple hours later.

It’s been smoking hot outside and I’ve been finishing my deck in full sun, wind blocked by the house and garage.
 
Its probably the reta. I get a consistent increase in RHR on Tirzepitide of around 10bpm.
 
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