to determine if sympathetic nervous system activity is heightened during psychological stress in older adults , plasma norepinephrine ( ne ) , epinephrine ( epi ) , heart rate , and blood pressure were measured in 10 healthy old ( mean age , 68.5 yr ) men and 10 healthy young ( mean age , 26.6 yr ) men during a 12-min mental stress test .
C0028351
norepinephrine
C0014563
epinephrine