tokens: At the start of the performance ride , plasma glucose averaged 4 . 2 + / - 0 . 2 , 5 . 2 + / - 0 . 1 , and 5 . 7 + / - 0 . 2 mmol . l - 1 in CON , CHO - 7 , and CHO - 0 / 21 , respectively ( all different , P < 0 . 05 ) .