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Garmin connect calculation the wrong TSS and IF from my cykling rides (with a power meter)

Former Member over 4 years ago

Hi.

Today I noticed that my last rides show the wrong TSS and IF in Garmin Connect. You can see the stats below.

When the file is synced to Training Peaks the IF is 0,74 and the TSS is 66. In both TP and Garmin Connect the FTP is set for 274 w,

Any idea of what´s wrong here?

0 trux over 4 years ago

Perhaps the document What Is Intensity Factor on My Garmin Fitness Device? could help. It tells:

*In order to receive an accurate IF® calculation, you will need to set your accurate FTP in Garmin Connect's power zones. For further details on IF®/FTP, view the Training Peaks website.

0 Former Member over 4 years ago in reply to trux

I will take a look but still, the numbers dosen't add up on the picture.

0 trux over 4 years ago in reply to Former Member

the numbers dosen't add up on the picture.

From the document I understood you had to enter the accurate FTP in GC power zones. Probably it takes that value, and not the one from the Activity, when calculating the IF

0 Former Member over 4 years ago in reply to trux

And I have done that. 274 is accurate and I have manualy enterd it.

0 trux over 4 years ago in reply to Former Member

And I have done that. 274 is accurate and I have manualy enterd it.

Before you did the activity, or after it? The new value may have effect only on future activities.

0 Former Member over 4 years ago in reply to trux

I did it before. And all the metrics has been right before. This is a new problem for me.

0 trux over 4 years ago in reply to Former Member

OK, I see. Please post a link to this activity, and to another one, where it was right. I can look at the background JSON data, and try to find where the difference is. Do not forget to set the privacy option on those activities to Everyone.

0 Former Member over 4 years ago in reply to trux

Thank you!

Hope I done it right so you can se the activitys.

Wrong IF/TSS

https://connect.garmin.com/modern/activity/5975766149#

Right IF/TSS

https://connect.garmin.com/modern/activity/5576789830

0 Former Member over 4 years ago in reply to Former Member

And here you can see the same ride thats wrong on garmin but right att TrainingPeaks.

tpks.ws/HWGJKZFJJK65NTI4FEYTRMETSU

0 trux over 4 years ago in reply to Former Member

Well, I did not analyze the JSON data yet, just checked the data on the screen, and I see already one suspicious thing that could have some relation to the troubles you experience - the HR Zones differ significantly. While at the Activity 5576789830 (OK), the Threshold Zone Z4 is at 149-166 bpm, at the other activity the Z4 is at 161-168 bpm. Did you change the HR Zones in the meantime, or do you use some auto-adjusting mode for the zones?

Power zones are the same in both cases, but I have yet to look at it deeper to see whether there is not some association between those two.