When you are sitting, your thighs are close to level horizontally. That reduces the amount of work the heart has to do somewhat to keep the flow. When standing erect, the full force of gravity has to be overcome to do the job. Hence a slight rise in blood pressure and heart rate.
Laying down also helps to reduce the effort required to move the blood.
Why is blood pressure and heart rate differ when measured sitting and standing positions?
bcoz both the condition are different
blood vessels r pressurized in diff pressure
in standing position legs have more weight
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