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.