at the level of activity achieved ( fivefold elevation of total body o2 consumption and threefold elevation of cardiac output ) , significant ( p less than 0.05 ) increases in plasma norepinephrine and epinephrine concentration ( from 150 +/- 23 to 341 +/- 35 and from 127 +/- 27 to 222 +/- 31 pg/ml , respectively ) were present , as well as smaller but significant increases in plasma renin activity and plasma aldosterone concentration ( from 2.2 +/- 0.3 to 3.1 +/- 0.6 ng x ml-1 x h-1 and from 98 +/- 8 to 130 +/- 6 pg/ml , respectively ) .
C0028351
norepinephrine
C0014563
epinephrine