Maybe the value of fatigue also depends of the duration? Something easy in math 30 minutes 0.5 Fatigue, 45 minutes 0.75 and 1 hour 1.0 fatigue
The factors are applied to the training load for the activity which is derived from the duration (among other things) so the duration is already accounted for.
@david - My HR is a fair bit higher for indoor sessions (I’m sure that’s pretty common). Obviously this doesn’t matter for the actual TSS score from those indoor sessions, because I always have power.
But could the indoor sessions be excluded from the model? They might already be, of course!
Hmm that would help a bit with time in zones and average HR models but it would also make the data sparser. I will have a look and see. Tx.
It would be sparser - but I do think more accurate (at least for me).
My outdoor rides estimated v actual TSS are pretty close, but last week’s indoor rides estimates were significantly higher.
I have the same issue, but it’s because my indoor FTP is really about 30 points lower, whether for biomechanical reasons or a difference in the power meters. I use the time-in-HR-zone estimate on my commuting and goofing around bike and would like to be able to exclude indoor data. It would also be nice to use only fairly recent data for the estimate because of seasonal fluctuations in fitness.
I have added this to the todo list.
Hi @david, does one of these options match the training load calculation performed by Training Peaks?
I can see quite a difference right now between the two platforms for outdoor activities, where I do not have a PM.
I haven’t seen anything published as to how TP does it and I am not a TP user myself so I am not sure. Maybe HRSS if your resting HR and max HR are correct?
I’ve found this article that says that “hrTSS will only be used if there is not enough data to calculate TSS, rTSS, or sTSS” so you are probably right.
The two metrics differ because the default for cycling here is Time in HR Zones and not HRSS.
What’s your logic for making StandUpPaddling fitness 0.0 fatigue 0.0?
I have only seen people doing it and didn’t look like much cardio … but open to suggestions from actual standup paddling people 
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I am using Ice Skating as my activity for speed skating. Would you assume that a factor > 0% for Fitness apply to this type of activity? What % would you then to apply? Attached is a view of my latest skate.
Thanks,
That looks like cardio from the HR traces so probably best to go with 100% for fitness and fatigue.
Hi David! I’m quite new on Intervals.icu but I like it so much and I believe it can help also stand up paddlers. I’m a SUP coach and I start to use Intervals.icu to work with my athletes. I have a couple questions:
- Is it any chance to get the “distance per stroke” data that Garmin already provides? For now, we don’t have any way to measure the power per stroke, so “distance per stroke” is the only way to get an idea about how strong we’re paddling in each stroke, intervals and session. Of course wind, currents and ocean conditions affects a lot on this value, so it’s only helpful when we paddle on a “perfect” conditions.
- I can see the presets for HR Zones, changes on % according if it’s used for cycling or running, witch one do you think it would be better to use it on stand up paddle.
- In our sport we can use different equipment (boards and paddles) according the discipline (sprints, long distance, open ocean, flat water). Garmin has already the feature to predeterminate more than one equipment per sport and change if it’s needed. Could you also take this data? I saw in Intervals I can add my equipment but I only can default one, so would be perfect I could chose a board and a paddle.
Thank you!
Thanks! I added a custom activity field to calculate distance per stroke:
You can add that to your athletes. Select one of the athlete’e SUPs and click “Custom” under the activity timeline chart and then search for the field:
You will need to re-analyse existing activities to see the new field value.
Unfortunately you can’t see this for intervals yet, only the whole activity. I will be working on custom fields for intervals soon.
I don’t know what set of HR zones would be good for SUP. I only do cycling myself.
I have added a top level gear type “Board” and a component “Paddle”. Currently to select different sets of equipment you need to create multiple top level gear items and configure them differently.
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Totally amateur SUPer here, but the me who undertook a 220k event over 5 days in September, where I spent up to 8h in Z1-2, feels very much that SUP is cardio 
. I agree that probably most people practice SUP for a bit of outdoor chill, but these people mostly won’t be recording it on their Garmin and/or Strava. Your choice is not too much of an issue having the ability to make it 100% contributing for myself, but I do think the default, for your audience, could be 100%.
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Thank you for the Distance per Stroke feature! That metric is also very used by rowers for on the water work, so I have added it to my OTW rows. I would suggest editing the description to say it is for SUP and for rowing (and possibly other paddle sports, to double-check).
Good luck on th 11SUPCity Tour, I did it in 2018 the non stop and 2023 seems I’ll back, not sure yet on the five days or non stop again.
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Hi David!
thank you for adding the metric, when we can get it fo intervals would be perfect!
About the equipment, I’m affraid I didn’t explain mysel properly. The paddles aren’t a component, they’re part of the equipment. The point is it would be awesome to define my default equipment for SUP:
- board: Sunova 14’ x 21’5
- paddle: Quickblade T2
so when I check my training I can see the equipment use it, but if for that training I used another board or paddle be able to change it and add the kms to this equipment.
I hope I’m more clear now. Thank you!