YMMV, but I tend to race better fatigued. As in I race better at week 3 of a Build week as opposed to the end of a recovery week 
. So my anecdotal evidence over the past 5 years of racing is that I can’t be too fresh.
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Ha! Yes! It’s tough to power a study that much, though.
You may not recall when I was futzing around with the ‘day of MCT upregulation’ based on Green’s paper. In that paper they saw MATERIAL upregulation of monocarboxylate & glucose transporters w/in hours of training stimulus. So you could at least hypothesize that adaptation could happen in days…but I think that hypothesis goes of the rails if you instead first train the subjects for ~20 weeks and then do the Green MCT/GLUT upregulation protocol.
https://journals.physiology.org/doi/full/10.1152/ajpregu.00699.2007
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3 × 5 
3 × 25 
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I doubt it will impact the Race negatively, there is enough time to recover fine, if it helps you psychologically I d probably do it if it’s your most important race of the season maybe don’t do the hardest workout you can think about. I probably would prefer to do some Harder Anerobic or VO2 max style efforts, because I need to get used to that feeling more personally
Just a local race that I’ve wanted to do since 2015 and never got around to it. Looks like it’s going to be an opportunity to explore the limits of hypothermia.
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