Recently I do have Base-Runs in my Garmin Run Coach Training with unusal heart peaks. If it occurs it is often just for less than 60s. If it happens in the first 10 minute it can last for longer.
The belt sits tight. I always make it wet with water before wearing it.
I do have the impression that they are wrong measurements. Sometimes a Base-Run is recognized with anerob effort. It is an issue for me because Garmin Run Coach adapts the next training based on this.
Any ideas how to fix this?
Wrist sensors you can't trust at all and obviously it is the case for the most expensive HRM600 as well.
You may just be unlucky to have a defective device. Personally, I get very accurate data from both sensors - as well from the wrist sensor as from HRM 600. I compare both sources frequently, and they are almost always closely identical, practically undistinguishable. And I compare the data also with other HRMs, so am pretty sure, the data is accurate. Have a look below for an example from today's run. The red (wrist HR) and blue (HRM 600) curves are practically identical, an overlapping exactly ~99.9% of the time. You have to zoom to the max to see some really tiny differences, which are unavoidable due to the delay between the electrical and optical signals. So for me, both the watch standalone, as well as the strap are perfect, and I cannot confirm your conclusion.
If you post a sample FIT file of one of your activities, demonstrating the problem, I can try to analyze it, and guess where the problem could be coming from. Perhaps it is not at all the strap that has a problem, but rather the watch. Or some CIQ app, draining the CPU, and causing the drop out is also a possibility.
Thank you very much for your offer and support.
Heart Rate in Red
Resperation Rate in Gray
Battery level: Fenix 8 > 30% HRM600 75%
Meaningless heart rate: 01:00 to 04:26, 06:00 to 06:35, 49:00 to 49:26 and other less obvious.
Some drops in heart rate that look suspicious eg. at 5:51 I was running downwards
Pace slower than 6:00/km and faster than 05:25 are GPS-issues - more than usual today - no buildings or none arround, just cloudy
New fun fact: Today Fenix 8 told me that I ended my sleep at 2:58AM and moved the planned training from today to tomorrow. It lost just 3+hours of sleep. This was the first time in 10 months. Metal strap instead of silcone one last night but not the first time.
Sorry! Another try: 21775138255_ACTIVITY.fit↷
Yes, it looks better. Below, there is the comparison of the HR from the wrist sensor, and from the external HRM.
As you can see, the values from both sensors are pretty much identical, except of the periods corresponding to the Respiration Rate dropouts, but even then the difference is not dramatic. However, although I am pretty sure the HR from the strap was more accurate, the watch (using the HR Data Source Switching) gave the priority to the internal wrist sensor, and that's why it stopped recording also the Respiration Rate.
You can avoid that the watch resorts to the less accurate wrist HR, by disabling the source switching in Wrist HR settings, in Sensors & Accessories. That should take care of the respiration rate dropouts. On the other hand, it won't really help with the issue from the OP. The peaks of high HR are present with both sensors, so I'd tell it is practically certain that your heart rate was really increased.
