the relationship between the time course of heart rate and venous blood norepinephrine ( ne ) and epinephrine ( e ) concentrations was studied in 7 sedentary young men before and during 3 bicycle exercises of 5 min each ( respectively 23 +/- 2.8 % , 45 +/- 2.6 % and 65 +/- 2.4 % vo2max , mean +/- se ) .
C0028351
norepinephrine
C0014563
epinephrine