why is my blood pressure lower when i lay down than sitting up
Three follow-up visits were conducted, as well as annual telephone interviews and active surveillance of hospitalizations and death. Five percent of the subjects (603 of them) were diagnosed with a rapid drop in blood pressure when going from lying down to standing up. The authors defined orthostatic hypotension as a 20 mmHg or greater drop in systolic blood pressure or a dip of at least 10 mmHg in diastolic pressure. Those who had a history or symptoms of atrial fibrillation at baseline were excluded from the study.
When the body then sits up, there is an increase in blood pressure and heart rate. Again, this is as I would have expected, since the body is now having to work a little harder to get the blood around the body. Finally, when standing, there was no noticeable difference in my blood pressure from the sitting position.