I think with the exhaustion happening for an extended period of time after the ride - not during it - nutrition's probably a good angle.
I just happened to read something about magnesium and how much is lost in sweat (a lot). Magnesium deficiency can result in fatigue and confusion (so can a lot of things, of course). A lot of electrolyte replacement beverages, especially the cheaper ones, don't replace magnesium. When you were tracking your minerals, were you taking sweat losses into account? What I read was in the neighborhood of 6 mg per hour/liter of fluid.
If you're like me, when I increase exercise volume, I tend to get the extra calories from calorie-dense foods, when what I really need to be doing is increasing EVERYTHING. If you haven't increased your vegetable intake to match your total calorie increase, that's something to think about.
Just a stab in the dark because I coincidentally happened to read that...




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