HRV data replaced by unknown data in .fit files

Since last weekend, my Fenix 5S is not recording HRV data anymore. Decoding the fit file, there's something else appearing where HRV data normally would.

A normal fit files converted to a .csv, it looks like this: [TABLE="border: 0, cellpadding: 0, cellspacing: 0, width: 288"]
[TR]
[TD="width: 64"]Data[/TD]
[TD="width: 64, align: right"]14[/TD]
[TD="width: 64"]hrv[/TD]
[TD="width: 64"]time[/TD]
[TD="width: 64"]0.38|65535|65535|65535|65535[/TD]
[TD="width: 64"]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]13[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]hrv[/TD]
[TD]time[/TD]
[TD]0.332|65535|65535|65535|65535[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]13[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]hrv[/TD]
[TD]time[/TD]
[TD]0.408|65535|65535|65535|65535[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]13[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]hrv[/TD]
[TD]time[/TD]
[TD]0.373|65535|65535|65535|65535[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]13[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]hrv[/TD]
[TD]time[/TD]
[TD]0.369|65535|65535|65535|65535[/TD]
[TD]s[/TD]
[/TR]
[/TABLE]

The new files look like this: [TABLE="border: 0, cellpadding: 0, cellspacing: 0, width: 288"]
[TR]
[TD="width: 64"]Data[/TD]
[TD="width: 64, align: right"]14[/TD]
[TD="width: 64"]unknown[/TD]
[TD="width: 64"]unknown[/TD]
[TD="width: 64"]0|0|0|24[/TD]
[TD="width: 64"] [/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD="colspan: 2"]10|0|0|32[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD="colspan: 2"]128|3|0|40[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD="colspan: 2"]11|253|7|0[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD="colspan: 2"]52|240|11|8[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD="colspan: 2"]2|176|39|16[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD]0|0|0|24[/TD]
[TD] [/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD="colspan: 2"]10|0|0|32[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD="colspan: 2"]128|3|0|40[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD="colspan: 2"]11|253|7|0[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD="colspan: 2"]52|240|11|8[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD="colspan: 2"]6|24|112|16[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]0[/TD]
[TD]record[/TD]
[TD]timestamp[/TD]
[TD="align: right"]9E+08[/TD]
[TD]s[/TD]
[/TR]
[TR]
[TD]Data[/TD]
[TD="align: right"]14[/TD]
[TD]unknown[/TD]
[TD]unknown[/TD]
[TD]0|0|0|24[/TD]
[TD] [/TD]
[/TR]
[/TABLE]

I have no idea what those repeating strings of 4 digits represent, I haven't changed anything on the watch as far as I know, and I'm using the same HR monitor as with my Edge 520 where the HRV is still working fine.

Any ideas?

0 mschole over 6 years ago

Not sure what you mean? Have they changed how HRV reports in the fit file?

0 mschole over 6 years ago

Ah I see what you mean. Thanks for that. I wonder why it's just started now, after working pretty flawlessly during the 6 weeks since I got the Fenix 5s. Is there any way to turn off the OHR during an activity?

Maybe the Tickr needs a new battery. Except it's fine with the Edge 520, no dropouts or any reason to think that the strap isn't working properly. Admittedly I do not use the Fenix at the same time so it's not transmitting OHR during cycling.

0 mschole over 6 years ago

I re-paired my Tickr HR monitor and made sure it was paired via Ant+. Worked tonight on my run just fine, so I guess I will keep an eye on it. Thanks for your help.

0 nmyeti over 6 years ago

For what it is worth, I had some similar HRV oddness with the Tickr X last year. I ultimately replaced it with an HRM-Run and haven't had an issue since.