NEULOG BLOOD PRESSURE LOGGER SENSOR GUIDE
NeuLog blood pressure logger sensor
NUL-222
The NeuLog blood pressure sensor can be used for any science
experiment which involves blood pressure measurements such as in
the fields of Exercise Science, Biology, Physiology, Human Health,
etc.
The sensor comes pre-calibrated so you can start experimentation
right out of the box using this guide.
Among hundreds of possible experimental subjects that can be
studied with the NUL-222 sensor are: exercise studies, human health
studies, athlete comparisons, blood pressure abnormalities, and
many more.
The blood pressure sensor's measurement units are:
Millimeters of mercury (mm Hg): A standard non-SI pressure
measurement unit
Analog arbitrary units (Arb): An arbitrary value used to
demonstrate waveforms without a unit
Millimeters of mercury and analog arbitrary units (mm Hg +
Arb): A combination of both units
The blood pressure sensor measures the gas pressure in a cuff
attached to a person's arm. This pressure is equal to the pressure
operated on the subject's arm.
The heart beats affect the subject's pressure and thus create very
small fluctuations in the gas pressure in the cuff. These fluctuations
are what doctors hear when they perform a blood pressure check.
The sensor's hardware and firmware separate the average pressure
and the pressure fluctuations. They amplify the fluctuations and then
add these amplified fluctuations to the average pressure, creating a
signal that enables the calculation of the MAP, the systolic and
diastolic pressures.
The three ranges of the sensor show the real measured pressure
(with very small fluctuations in mm Hg), only the pressure amplified
fluctuations (Arb) and the combined signal of both of them.
In the "mm Hg + Arb" mode you can calculate these parameters:
MAP:
MAP (Mean Arterial Pressure) is the pressure where the fluctuations
are maximal.
The firmware starts by checking first the average pressure where the
largest fluctuations are.
Systolic:
The pressure exerted by the blood on the arterial walls while the
heart is beating (maximum pressure achieved). Ideally this value
should be in the 90 to 120 mm Hg range for adults and roughly 100
mm Hg for children aged 6 to 9.
This is the average high pressure where the fluctuations' magnitude
is 54% of their magnitude at the MAP.
Diastolic:
The pressure exerted by the blood on the arterial walls while the
heart is relaxed, between beats (the minimum pressure achieved).
Ideally this value should be in the 60 to 80 mmHg range for adults
and around 65 mmHg for children aged 6 to 9.
This is the average low pressure where the fluctuations' magnitude is
72% of their magnitude at the MAP.
