Commonly used arm positions can overestimate blood pressure readings: study

I’ve never seen a discussion how ‘reactive’ one is physiologically either when discussing BP. That is, is one the kind of person who is generally calm throughout the day, or is one who has larger swings based on various stimuli? I’ve had readings as high as 155/95 when stressed rushing to a doctor’s office visit and readings as low as 105/62 when calmer. I suspect blood pressures varies wildly through the day, and this variation depends on a person’s physiology.