I can't imagine living without my DUNKIN! I drink a huge mug every day! 24 hours without? They must be crazy! How do they expect me to RUN on a treadmill? Much less wake up and listen to directions from that barking cardiologist? BLAH BLAH BLAH! I'm going to cheat! One small cup, 4 hours before I go in. HA!
Caffeine in coffee is altered and designed to be an unnatural stimulant to the body. This alone causes stress on the heart. They want to test the heart in it's natural state and without outside stimulation. Good luck!