I wanted to thank everybody for their input on this. I just finished up the workout about 15 minutes ago and wanted to share my thoughts while they’re fresh in my mind.
Since I usually do my rides and workouts fasted with just water to drink, (early morning guy here) I went ahead and did Baxter that way too. To give myself a safety net, I took the advice from @RONDAL and mixed up a big bottle of Roctane to have handy in case I started feeling bad but I never did - I had a sugar free green tea for some caffeine as I was getting set up and then drank about 1.5L of water during the workout.
If it had gone on much longer (or been planned to go on much longer) I’d have reached for the Roctane; my focus started to wander about 1:10 or 1:15 into in - had trouble paying attention to the cadence, which caused the power to wander (I was doing it in Resistance mode up until that point) so I clicked it over to Erg mode for the last 10 or15 before the cooldown started. I never felt bad physically, it was a concentration issue. I suppose it was combination of fatigue, low blood sugar, and my butt getting pretty tired/sore at that point.
I think I can/should apply this information to my outdoor rides (I only ride MTBs outdoors, with the occasional gravel jaunt) - for rides over an hour or so I should probably plan to have some carbs to keep the concentration up; seems like I might be able to avoid an otherwise dumb crash that way.
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