Time in zones based on Power or HR for Cycling

[Pierre Tamisier]

Dear GoldenCheetah Community,

I'm using GC3.5 and the Metric Reference from the Wiki. I'm looking to setup a chart for cycling that gives % of time spent in zones using power (if power numbers are available), or fall back to time in HR zones if no power.

To do so I was thinking to recalculate the metrics Ln_Percent_in_Zone and Hn_Percent_in_Zone using "Formula" and combine them together.

Pseudo-code as an example:

Sport = "Bike" ?

     L1_Time_in_Zone > 0 ?

          L1_Time_in_Zone / Duration * 100 : H1_Time_in_Zone / Duration * 100

Do you think I'm on the right track?

Happy to upgrade to GC3.6 and/or use python charts if it's easier.

Cheers,

Pierre

[Peret]

In GC 3.6 it is straightforward, as the are in the predefined tiles:

You can have Zones histogram gor power zones and heart rate:

[Ale Martinez]

El lunes, 10 de octubre de 2022 a la(s) 22:22:20 UTC-3, pierre....@gmail.com escribió:

Dear GoldenCheetah Community,

I'm using GC3.5 and the Metric Reference from the Wiki. I'm looking to setup a chart for cycling that gives % of time spent in zones using power (if power numbers are available), or fall back to time in HR zones if no power.

To do so I was thinking to recalculate the metrics Ln_Percent_in_Zone and Hn_Percent_in_Zone using "Formula" and combine them together.

Pseudo-code as an example:

Sport = "Bike" ?

     L1_Time_in_Zone > 0 ?

          L1_Time_in_Zone / Duration * 100 : H1_Time_in_Zone / Duration * 100

Do you think I'm on the right track?

That expression is not well formed, see the wiki, to define a metric you should read https://github.com/GoldenCheetah/GoldenCheetah/wiki/UG_Special-Topics_Creating-User-Metrics, in this case value can be as simple as: 

value { Data contains "P" ? Ln_Percent_in_Zone : Hn_Percent_in_Zone;  }

but you also need count for the metrics to aggregate correctly:

count { Time_Recording; }

and you need to use new names, you can't override builtin metrics, to apply this only to Bike activities you can use the relevant function.

 

Happy to upgrade to GC3.6 and/or use python charts if it's easier.

I would recommend to upgrade to v3.6, it has several fixes related to these metrics.

[Pierre Tamisier]

Cheers Ale. I updated to GC3.6. Based on your response and the doc/wiki I created some user metrics that allow me to track % of time spent in zone based on data available, in this order:

- power (bike)

- pace (run outside)

- HR (bike or run)

I have 7 zones for power and 5 for paces/HR. I created some user metrics in Golden Cheetah > Preferences > Metrics. For example:

For Z5/Z6/Z7 I default to P5 or H5 when no power is available. I use these user metrics in "Formula" in charts. 

Sharing for folks that may be interested.

Thanks again for your help!

--

Pierre

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[Joss Winn]

Aren’t these metrics already available as zone histograms and tables in 3.6 (as activity tiles in the overview) or am I misunderstanding what you have created? 

In the Trends view, time and percent in zones can be built into charts, too.

On 15 Oct 2022, at 06:13, Pierre Tamisier <pierre....@gmail.com> wrote:

Cheers Ale. I updated to GC3.6. Based on your response and the doc/wiki I created some user metrics that allow me to track % of time spent in zone based on data available, in this order:

- power (bike)

- pace (run outside)

- HR (bike or run)

I have 7 zones for power and 5 for paces/HR. I created some user metrics in Golden Cheetah > Preferences > Metrics. For example:

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<Time in Zones 1-5.gchart>

[Pierre Tamisier]

I think we are saying the same thing.

 

Aren’t these metrics already available as zone histograms and tables in 3.6 (as activity tiles in the overview)

It is my understanding that yes they are, but I want a combined version of time spent in zones for all my bike/run workouts (indoors/outdoors), not at the Activity level, but over time.

In the Trends view, time and percent in zones can be built into charts, too.

That's what I'm trying to do, defining User Metrics (Z1/Z2 etc. calculated based on whether the data file has power, pace or HR) as I described in my previous email.

--

Pierre

To view this discussion on the web visit https://groups.google.com/d/msgid/golden-cheetah-users/5F4A0CB0-9D01-45CF-BF2B-D1D7AB9E6F91%40josswinn.org.