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I know that muscle tension and heart rate goes up as we get stressed, but what if in normal conditions some have a lower heart rate and muscle tension while others higher?

Does this say something about brain configuration? Temperament maybe? Do sanguine people have lower such stats than say choleric people? I have seen that similar people have same stats, in this case high stats people are always static characters (they don't change easily), have strong personalities, and are workaholics... etc.

I am pretty sure there's a study on this, I was wondering if anyone has any idea as to where to find it.

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Your first question can be answered with "Statistics." A carefully designed experiment would account for as many confounding factors as possible. –  Chuck Sherrington Oct 2 '13 at 7:31
    
And yes, you're in the right place! :) –  Chuck Sherrington Oct 2 '13 at 7:31

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