Is this something in development 
Would make sense since caffeine is one widely studied supplement that lowers RPE and enhances performance. So could be a good move to have this as an optional additional feedback mechanism.
Same thoughts here:
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they need a button for “always” lol
Joe
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You have to take shed loads of caffeine to get measurable performance gains.
A strong coffee doesn’t do it.
“Hold my ristretto “
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2 strong coffees probably does though
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Probably
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I tried 200mg before an XC race last year. Hard to tell if it helped on the climbs but I was jittery as hell on the descents. Definitely not for me.
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I can’t find the original science that showed a 5% performance gain in cyclists, must be ten years ago-ish. It was an unreasonable amount of coffee youd have to drink, it was done by supplementation.
A litre of French Dark Roast might get me 1% I think. If I could stay focussed on whatever race I was supposed to be doing.
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People’s responses to caffeine differ wildly. The amount needed for performance improvement is very individual.
That being said, it’s 4:40 a.m., I’m barely awake and just drank a preworkout with 2 scoops amino energy before hopping on a 2 hr ride. I make it every night before bed when I have morning workouts and set it on my nightstand. Total lifesaver.
Except the time I woke up thinking it was morning and drank it. My wife heard it and asked what I was doing as it was the middle of the night. Now I always check the time first.
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I don’t know what you classify as measurable performance gains but would disagree with your statement here.
> Small caffeine doses (e.g. 2-3 mg/kg (~200 mg)) are effective at improving performance, irrespective of whether the caffeine is ingested before and during (in the case of endurance tasks) exercise. > The major benefits of this dose of caffeine on exercise capacity and performance appear to be achieved by central nervous system effects, specifically those involving antagonism of adenosine receptor.
More here: https://www.ausport.gov.au/ais/nutrition/supplements/group_a
Or easy to google and find plenty of studies that use 2-7mg/kg. That is probably more than one cup, but easily done in 2-3.
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One thing about caffeine intake is its affect on heart rate. now that the AI model looks at heart rate, it could look like the effort was harder than it actually was.
Although that’s not “free heart beats”, they still come at a cost.
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Reads a bit vague to me - they don’t describe a measurable benefit. Their dose may improve performance, side effects may include increased heart rate…
But I obviously can’t defend a position which is just an old recollection of mine, until I find the study. 
Just google caffeine impact on cycling performance, tons of studies. Effect of caffeine ingestion on time trial performance
It is one of the few really well documented supplements.
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I’d love to see this as part of the survey.
I’m a high responder for caffeine. For any race up to ~5 hours, caffeine provides a significant performance boost for me. I’ll also use it on hard interval days to reduce RPE. I avoid it all other times and don’t drink coffee anymore. Makes the response much stronger compared to when I’m taking it every day.
For longer races, I still use it, but it has to be applied carefully or it can backfire with a crash and/or stomach issues. Usually a slower drip across the day vs. hammering a bunch early.
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Just to save time, could this be checked by default?
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Nice mockup, @Rizzi 
So convincing I had to check if it was actually an option. 
Did you fiddle with developer settings in the browser to do it?
Also took me a while to notice why I got a notification for this one. 
Agree with @JMGant: a nested checkbox in settings “New activities checked by default” would serve both camps.
Not contesting the general positive attitude, but specific gains and dosage - have you seen a x% performance gain in your timetrials after two cups of coffee?
I haven’t.
Just a little screenshot edit.
For me it’s similar as @grwoolf … only use coffee/espresso for hard workouts and short triathlons. A simple espresso lowers RPE and very hard workouts come closer to just hard.
If you search for studies just use this prompt for ChatGPT and you will see solid effects:
“List the 10 most received studies on caffeine intake for endurance athletes with regard to performance gains or lowered RPE. to each study summarize the results and abstract with two sentences. and in the end give a complete overall summary and recommendation”
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It’d be nice to see an option about fatigue or lack of recovery.
Tuesday I had 90 mins vo2 intervals in the morning and then a heavy leg workout with 3 sets deadlift at 1.75xBW for 6 reps followed by squats and various isolation exercises. Thursday I did a 90 min over under. I rated it at very hard which dropped my predicted FTP by several watts. Had I have not been a bit fatigued from Tuesday, it would’ve just been hard. I don’t log weightlifting sets since they’re not to complete failure. I’m strong enough there’s no sense in risking injury regularly going to failure.