GEORGEP

I keep reading about blood pressure readings at different times of the day and under conditions such as in traffic and other stressful situations. I know that the lowest readings I get are at home when I am relaxed. My doctor office readings have also been good. Last visit 120/78. I still get occasional readings that are borderline or over 140 for the systolic reading. The diastolic is never over 90. I guess what I am trying to find out is do people who do not have high blood pressure---When they are under stress do their readings go over 140/90?? Or is high blood pressure just defined as having high readings when blood pressure is taken after siting quietly for five minutes in a relaxed atmosophere?? I also notice that after exercise my readings stay lower for hours...