BCAA supplementation increases resistance to fatigue and enhances lipid oxidation during exercise in glycogen-depleted subjects.
-Branched-chain amino acids supplementation enhances exercise capacity and lipid oxidation during endurance exercise after muscle glycogen depletion. Looks like subjects did a long glycogen depletion exercise bout followed by a short, maximal stress test the following day. (note only 7 subjects in this study)
Good summmary of branched chain amino acids at HealthNews