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Yeah, durability might be a more accurate term for the ability of an ultra racer to set off at a steady moderate power and keep that up for days or weeks. Though their ass and hands etc. have to be durable in different ways too, so maybe muscular durability would be a better wording. Though it would also need to be aerobic durability or whatever.
Fatigue resistance has already been used for what seems to be the same thing they mean here and would seem to describe it better.
https://www.trainingpeaks.com/blog/the-role-of-fatigue-resistance-at-the-tour-de-france/
https://www.outsideonline.com/health/training-performance/fatigue-resistance-research/
https://www.highnorth.co.uk/articles/fatigue-resistance-durability-cycling
http://jakubsliacan.eu/srmr/2023/09/06/srmr23-training.html
If that was true I'd be pro
Their terminology needs work.
Surely efficiency is a more apt term for what they're trying to measure?