to investigate the relationship between dopamine ( da ) released into the bloodstream and sympathoadrenal activity , levels of free da , norepinephrine ( ne ) , and epinephrine ( e ) in plasma were recorded in four dogs subjected to three tests : treadmill exercise at two work levels [ 55 and 75 % maximal o2 uptake ; 15 min ] , normobaric hypoxia ( 12 % o2 ; 1 h ) , combined exercise and hypoxia .
C0028351
norepinephrine
C0014563
epinephrine