What you wish to do is to spike blood sugar ; a rise in Insulin levels is a consequence of high blood sugar levels, it is not a cause in itself. That said, what you wish to do is take a high glycemic shake ,not too far before your workout (with protein), so in which case your blood sugar levels are ready to peak by the time you hit the gym (you want to AVOID the high Insulin peak). Once the Adrenalin and NE are flowing, this will block Insulin, and will make the blood sugar available for your body to use as energy. If you spike blood sugar too far before your workout, before Adrenalin and NE are released, then you will get the rebound hypoglycemia (low blood sugar), in which case you will be tired.
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