 Epinephrine activated the sympathetic nervous system and produced systems such as an elevated heart rate and blood pressure.The researchers then either told the participants the effects of the epinephrine, said nothing about any potential effects of the epinephrine, or told them they may feel some effects that had nothing to do with the epinephrine (for example, the researchers told the participants they could experience a headache from the shot).The participants were told that they had to wait 20 min for the Suproxin to get into their bloodstreams.