concomitant measurements of circadian variations in the urinary excretion of dopamine ( da ) , homovanillic acid ( hva ) , norepinephrine ( ne ) , epinephrine ( e ) as well as of creatinine , sodium and potassium under controlled dietary conditions during relative physical and emotional rest in 13 volunteers have shown that maximum excretion of all these substances occurred in the afternoon period between 14:30h and 18:00h , and minimum excretion in the morning between 4:00h and 5:00h .
C0028351
norepinephrine
C0014563
epinephrine