Some XERT improvements needed!?

I did a long endurance ride outside with no powermeter but with heartrate monitor.
The effect is there is no power and nog XSS and thereby my status is in fact not correct.
Secondly it reports the time of the ride incorrect (total time in stead of moved time), moved time can be diffeterent on (extreem) long rides!

Xert should report moved time instead of total time. Others like Strava and are reporting this correctly.

If there is no powermeter the ride should (and can) still be taken to calculate your status/fitness (and also XSS I think). Based on historical data (with heartrate and powermeter) it is possible to derive this, see for instance for this.

Can it be possible to improve Xert for this (moved time and derived power etc)? It makes Training Status valueble which for now it is not!

Hi Ed,

Please check that your activity is not flagged. If so, unflag it in order to get an heart rate derived result.
Furthermore, did you enable the heart rate derived option in your profile settings?

Gr Johan B

Thanks for the fast answer! The profile was already oke, but there was a flag! Don’t understand why there was a flag but I removed it. Now better results of the ride and status. The only thing that remains is the time moved. It is not 11+ ours but should be (according to Strava) 9 houors and 54 minutes. Is this effecting the data also!?

The flag was probably there because you have stopped for a coffee brake or so and no data was recorded for heart rate. Since Xert is mainly focused on non-stop workouts this is initialy flagged as something being wrong.

There has been quite some discussions on the topic of moved time versus total time.
In Xert total time is being used and to my understanding it doesn’t impact the working of the system.
So coffee brakes are perfectly fine and won’t hamper the system :slight_smile:

It doesn’t, but it looks silly if you do ride with power and the average drops 60 Watts, compared to Strava. Then again, XEP is still fine :joy:

Total time makes sense. If you’re not riding, you’re recovering, and this impacts the MPA calculation.


Ride 1 - 30 mins @ 200W, 30 minute coffee stop, 30 mins @ 200W
Ride 2 - 60 mins @ 200W

If you only report moving time both of those would be the same, when the impact on the body and training stress is very different.


Absolutely and that’s touching on the core principles of Xert. But your average moving Watts is 200 and not 133.

And, on second thought, I’m not sure about XEP. I checked a long mountain stage, with (summit) breaks and if I compare the numbers to Strava, they (all) seem to be calculated against moving time, except XSS, which is close to TSS (or training load, as Strava calls it)…

Looks like a difficult subject reading all this. As I understand now, for trainingload you must calculate Total time but for average power only omving time. Makes sense to me now. Would like to know how Treaningpeaks does the calculations for this. Are they taking into account the breaks also?

Perhaps it is better to register two or more rides if you have a long ride with breaks for lunch or longer coffee breaks? Would that make a better calculation for the work done overall?

I wouldn’t bother. Let Xert do the math and trust that on the target event date your fitness has improved as predicted. Are you using an indoor trainer also btw?

I have a Kickr Core for training inside. Bought this on advice of the coach I had (no longer because he left to Sunweb). This because my heartrate wasn’t to reliable. Outside I still Ride without powermeter but I am looking for a new bike and will ADD a powermeter in that case.
I train for (multiple days) ultracycling and find it difficult to get the right way training for that. I also have to take into account my age of being 68 (the danger of wanting to do to much, recovery takes longer then it used to be, sometimes difficult to accept)

Hi Edgar,

Interesting. We have some things in common :slight_smile:.
I also use a Wahoo Kickr Core. My suggestion is to buy an Wahoo Cadence meter to add since the Kickr Core doesn’t support cadence.
Furthermore I am also training for ultra endurance races (self-supporting, multiple days). Next one is the Race Around The Netherlands on 29 August.

I use the Garmin Viviactive 4 watch to check on my recovery. It is HRV based and gives me very good pointers how recovery is progressing. Also the heart rate in rest is very accurate and supports in that.

Gr Johan

1 Like

coincidence does not exist!
I use the Wahoo Cadence sensor also (sometimes using it for HRV measurement also)
I registered for RATN also but due to change of dates (bloody COVID) and a few (personal) reasons not sure I will be there.

haha, and to add to that. I think I found you on Strava and see that you live nearby. I am living In Wateringen so that’s only a few km’s :slight_smile:

Enjoy your day!

Gr Johan

That would give you metrics that match Strava’s, but for Xert’s core calculations, it doesn’t make a difference.

The only thing I’m not sure about, is how Xert qualifies the ride (i.e. easy, moderate, tough), if you use one recording.

Difficulty is based on an EWMA XSS/hr with a 30 min time constant. At times where you are stopped/coasting, your XXS/hr drops to 0 and difficulty score will also decrease.

The idea was to split it into two separate rides, not one with (a) break(s).

Two 1 hour continuous rides, versus one 2,5 hour ride with a 30 minute break, or two 15 minute breaks.

How will these be classified? It’s purely theoretical, but that’s what I was doubting.