When it's humid, you just keep sweating because it isn't evaporating and cooling your skin. It's just as important to keep drinking. As DBF's dad likes to say: Drink when you're thirsty. Drink when you're not. Drink in between.
That sounds like glycogen depletion--your liver and your leg muscles ran out, and you're not dumping amino acids from muscle tissue fast enough for your liver to turn those into sugar. Your blood sugar goes through the floor, and...well, you experienced it. You know what the problem is. So just remember to eat. I wouldn't ride after not eating for six hours, that's for sure!




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Glycogen depletion tends to lead to overall fatigue, so the leg cramp may well have been a manifestation of that. Or, if I recall correctly, you need ATP to persuade muscle to relax. A lack of sugar could certainly cause a cramp in that case...