At this time, only one study (112) has examined high intensity exercise performance after long term adaptation to a ketogenic diet, finding no decrease in performance. As performance at higher intensities are generally determined by non-oxidative metabolism, it seems unlikely that long term adaptation to a ketogenic diet would have an effect on exercise of this type. Since no research on this topic exists, any long term effects on performance are purely speculative at this time. The main determinant in performance in weight training is probably muscle glycogen levels. Thus, the amount of work that can be performed in a given workout will depend on starting muscle glycogen levels.
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