Spikes in HR data?

Mojopin

macrumors regular
Original poster
Apr 7, 2011
197
58
Hi, I have noticed that my heart rate info has been normal in the health app except there always seems to be strange (usually) singular spikes in the data that can be up to 129bpm which puzzles me. It seems to happen once a day on most of my readings. These high bpm's are sporadic and don't coincide with exercise as I don't work out with my watch on.

Just was wondering if anyone else has noticed any anomalies with the HR or could possibly smoking a cigarette really cause a resting rate of 80 to jump to 129 but still not the answer as I have smoked before and the readings stayed well under 100bpms?
 

MistahMumford

macrumors 6502
Nov 12, 2011
259
18
SC
Hi, I have noticed that my heart rate info has been normal in the health app except there always seems to be strange (usually) singular spikes in the data that can be up to 129bpm which puzzles me. It seems to happen once a day on most of my readings. These high bpm's are sporadic and don't coincide with exercise as I don't work out with my watch on.

Just was wondering if anyone else has noticed any anomalies with the HR or could possibly smoking a cigarette really cause a resting rate of 80 to jump to 129 but still not the answer as I have smoked before and the readings stayed well under 100bpms?
I don't smoke and notice the same thing from time to time
 

Mojopin

macrumors regular
Original poster
Apr 7, 2011
197
58
I don't smoke and notice the same thing from time to time
Thanks yeah it seems odd, I know it's not smoking as I just checked it after having one and it was normal. Good to know I"m not the only one having the random spikes.
 

exxxviii

macrumors 65816
May 20, 2015
1,423
555
Yes, the watch will get sporadic high and low readings. Because it only samples every 10 minutes, you cannot look on either side of a reading to judge its veracity. Almost every day, I will get one outlier reading that is 30 BPM to 40 BPM higher than the readings on either side. Similarly, I will often get a low reading that is 20 BPM to 30 BPM lower than the readings on either side of it.
 
Yes sometimes I get readings that I question the accuracy. When doing a weight lifting workout, the HR readings are basically worthless. But I also have had questionable one-off readings of my resting HR. Honestly, it's hard to know if it's reality or not.

I've especially questioned this during my sleep. I track my sleep, and I typically have a very low resting HR (40s and 50s) during the night. But without fail it seems like I almost always have 1 or 2 (sometimes as many as 15) readings that are >100, even gone as high as ~122. I'm a pretty fit person, and it takes a significant amount of exertion to go that high. I've long wondered about those, and decided to experiment with putting my watch in workout mode during my sleep (for those interested it used about 60% of the battery during a 7.5 hr sleep) to track my HR. In my experiment I noted that my HR was in fact elevated to >100 twice during the night for ~20 minutes each time. Is this normal? I dunno. Does this answer your question? Maybe not, but it does show that there are cases that you wouldn't imagine your HR jumping up randomly, but I have data to show that my HR did in fact become elevated.
 
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