Subjects ingested either an artificially sweetened placebo ( PL ) , a moderate-glucose beverage ( MG , 1.03 gmin ) , a high-glucose beverage ( HG , 1.55 gmin ) , or a GF beverage ( 1.55 gmin , 2:1 ratio ) during approximately 3 h of exercise , including 2 h of constant-load cycling ( 55 % Wmax , 195 17 W ) , immediately followed by a computer-simulated 30-km TT .