Personal records calculation

How are personal records calculated? 

The time for the 10km must be in one chunk. So for example when the starting and the final parts of a run longer than 10km are fast, then the algorithm will take the fastest 10km chunk from the run, but the average can be easily faster, if the slow part was somewhere in the middle and hence cannot be excluded.

Thanks for you response, 

According to you explanation and my run review(on the picture), I think there is a little bug: the fastest 10k is in 41'14" ( or may be faster but I can't see this without big calculation)

Do you agree?

And what does the Running tab in your Personal Records page show? Did not you reject, or omit to approve the new record?

You can also try going to the concerned activity, and in the context menu under the cogwheel symbol (up right), select the option "Set as PR" - and see what time it shows then on the PR page.

Yes, I approved the RP yesterday ( so more than 12 hours ago)

Thank for the trick! I did the manipulation but the RP stay the same...

No, it is not really what the description tells. It just tells that the distance of the activity does not need to match exactly the given record distance (10k), and that manual changes won't have impact. However, normally, the algorithm still searches the best exactly matching section within the activity and proposes it as a PR. I just checked couple of my previous activities with records - for example I had new 1km, 1mile, 5km and 10km records in one activity, and each of the PR respects the fastest section within the run (it was 17km long in fact).

In my case it seems to work correctly, so I do not quite understand why it did not work in your case. Unless you edited the activity manually, but I do not think you could edit the lap times, unless you imported the run from an external file, which I suppose is not the case.

Indeed, you're right, 

Moreover, the run has not been edited or imported,

Thanks you for your time, I will contact the support to notify them ( In case of other person have the same problem).

.. thinking about it again, it can be perhaps depending on the watch model - records are (at least partially) managed by the device, so it is possible that it is your watch that calculates the fastest section differently than mine. The fastest sections are then perhaps stored in the fit file, and the GC account just displays them. That's the only explanation I can find, that would explain why the fastest 10km section was not detected in your activity, while it works all right for me. What device do you use? Is it an older model, or a recent one?

It might be this!

I use the Forerunner 235 with the last update,