Oscillatory devices produce a digital readout and work on the principle that blood flowing through an artery between systolic and diastolic pressures causes vibrations in the arterial wall which can be detected and transduced into electrical signals.
All physical activity, excitement stress, eating, drinking, smoking, body posture and many other activities or factors ( including taking a blood pressure measurement) will influence blood pressure value. Because of this, it is mostly unusual to obtain identical multiple blood pressure readings.
Blood pressure fluctuate continually —– day and night. The highest value usually appears in the daytime and the lowest one usually at midnight.
Considering the above information, it is recommended that you measure your blood pressure at approximately the same time each day.
too frequent measurements may cause injury due to blood flow interference, please always relax a minimum of 1 to 1.5 minutes between measurements to allow the blood circulation in your arm to recover. it is rare to obtain identical blood pressure readings each time