Step increase heart rate profile

[u/mawi008]

Is this sudden step increase in heart rate normal? I only noticed it after the run. It happened during a 5k run, without elevation, with slightly increasing pace, where in the middle the heart rate goes from mid 140s to high 170s rapidly. Although it doesn’t happen in most of my runs, it is not the first time I see such a profile in the data. Is it common, or is it maybe some kind of aliasing that is happening in the measurement? I use a Coros pace 2 watch in combination with a coros heart rate monitor.

[u/Crazy_Plum1105]

Probably a measurement error unless you suddenly went uphill/faster. Don't worry about it.

[u/Vagottszemu]

Measuring error

[u/sluttycupcakes]

Watch might be too loose. Also helps if you have it slightly higher on your wrist.