Effects of nicotine and caffeine prior to Stress test?

I’d like to know exactly WHAT effect these have when used just prior to a stress test. I KNOW that it is standard practice, but I have yet to find out the medical/scientific answer as to what these two things actually DO to the results of a stress test. In other words, I’d like more of an answer of why not to smoke or have caffeine than "Just because" or "because it’s standard procedure" or "it negatively affects the results". Thanks!

It will raise the heart rate and blood pressure which will alter the test results. If you smoke or drink caffiene and it causes them to rise then you are already close to the target they are wanting you to reach during the stress test, you would have to do less work. It could show something is really wrong with the heart or it could give a false reading that nothing is wrong with the heart when there really is. Hope this help.

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