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