Heart rate during excercise

So today I dosed 5mg at 10:30am, (about 1+15 hrs after drinking 12 oz GFJ.). I then went to the gym at 4:15pm for a 4 mile treadmill workout which I do every 3rd day. (rowing machine and nautalis weights the other 2 between treadmill day) I noticed that my heart rate was much lower then normal rates. Usually it’s around 142-148bpm but today it was running about 121-128bpm. I was on the same machine I usually use and ran the same pace/times. I’m wondering if it was because of the dosing or the machine suddenly was acting up…? I’ll keep my eye out in 2 days when I run again and try to get the same machine.

any comments?

Was the temperature noticeably cooler in the gym on the lower heart rate day?

I have found my heart rate in the gym (I am not a regular attender although I use an exercise frame at home) goes higher when I use ATP enhancers such as MB, MK7, Creatine etc. I have no evidence on Rapamycin use as I am in the lower frequency category on this forum.

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No. Everything was the same.