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Collecting Data with the Blood Pressure Sensor
This sensor can be used with the following interfaces to collect data:
Blood Pressure
• Vernier LabQuestTM as a standalone device or with a computer (Order Code BPS-BTA)
Here is the general procedure to follow when using the Blood Pressure Sensor: The Vernier Blood Pressure Sensor is used to 1. Connect the Blood Pressure Sensor to the interface. measure systemic arterial blood pressure in humans (non-invasively). When used with Logger Pro® 3.4 or newer or Logger Lite® 1.3.1 or newer data-collection software, it 3. The software will identify the Blood Pressure Sensor and load a default data- can measure arterial blood pressure and calculate both the systolic and diastolic blood collection setup. You are now ready to collect data. pressure using the oscillometric method. The following is a partial list of activities and experiments that can be performed Data-Collection Software
This sensor can be used with an interface and the following data-collection software. • Measure blood pressure before and after exercise. • Logger Pro This computer program is used with LabQuest, LabPro, or Go!Link.
• Measure blood pressure while sitting or standing. • Logger Lite This computer program is used with LabQuest, LabPro, or Go!Link.
• Compare blood pressure after voluntary isometric contractions (weight lifting) • LabVIEW National Instruments LabVIEW™ software is a graphical
and a rhythmic activity such as running or biking. programming language sold by National Instruments. It is used with SensorDAQ and can be used with a number of other Vernier interfaces. See Investigate how digestion affects blood pressure. www.vernier.com/labview for more information. Study the effect of caffeine on blood pressure. • Compare blood pressure between smokers and non-smokers. NOTE: This product is to be used for educational purposes only. It is not
appropriate for industrial, medical, research, or commercial applications.
What is included with the Blood Pressure Sensor?
Using the Blood Pressure Sensor with a Computer
• Standard adult size adjustable cuff (27 cm to 39 cm) When performing blood pressure measurements, it is best to work with a partner. Currently, Logger Lite only supports blood pressure measurements in mm Hg. Follow these general procedures to use the Blood Pressure Sensor with a computer: • Blood Pressure Sensor booklet (this booklet) 1. Connect the Blood Pressure Sensor to Channel 1 on the LabPro or to a Go! Link. How the Blood Pressure Sensor Works
Attach the rubber hose from the cuff to the connector on the sensor. The active sensor in this unit is the SenSym SDX05D4 pressure transducer. It has a 2. Wrap the cuff firmly around your partner’s arm, membrane which flexes as pressure changes. This sensor is arranged to measure approximately 2 cm above the elbow. The two rubber hoses differential pressure. The sensor produces an output voltage which varies with the from the cuff should be positioned over the bicep muscle pressure measured in the cuff. It includes special circuitry to minimize errors caused (brachial artery) and not under the arm. Important: The
by changes in temperature. We provide an amplifier circuit that conditions the signal person having his or her blood pressure measured must from the pressure transducer. With this circuit, the output voltage from the Blood remain still during data collection—no movement of the arm Pressure Sensor will be linear with respect to pressure. 3. Start Logger Pro (version 3.4 or newer) or Logger Lite This sensor is equipped with circuitry that supports auto-ID. When used with LabQuest, LabPro, Go! Link, or SensorDAQ, the data-collection software identifies 4. Logger Pro or Logger Lite will identify the Blood Pressure the sensor and uses pre-defined parameters to configure an experiment appropriate Sensor and load the proper calibration. You are now ready to 6. Quickly and repeatedly squeeze the bulb to inflate the cuff on your partner’s arm. Continue inflating the cuff to a pressure between 150 and 170 mm Hg. A meter in Adjusting the Pressure Release Valve
the data-collection software will display the live pressure readings from the The pressure release valve is set to release at a rate of 3.0 sensor. When the maximum pressure is reached, set the bulb pump down onto the mm Hg/second on an arm of 32 cm in circumference. For table. The built-in pressure release valve will slowly deflate the cuff. arms much larger or much smaller it may be necessary to 7. After the pressure drops to 50 mm Hg, click adjust the valve so that the exhaust rate stays in the range of software and press down on the pressure release valve to release any air left in the 2.0–4.0 mmHg/s. With the bulb in hand and the hose cuff. If the pressure does not reach 50 mm Hg by the time data collection ends, leading away from you, place a screwdriver into the metal adjust the exhaust rate of the pressure release valve according to the directions slot on the top of the release valve. To increase the rate of listed under “Adjusting the Pressure Release Valve”. exhaust, turn the screwdriver clockwise. To decrease the rate of exhaust, turn the screwdriver counter-clockwise. The larger a subject’s arm the slower the release Helpful Tips
Blood pressure readings will differ from person to person and even between measurements on the same individual. Do not expect to receive the same Calculating Blood Pressure (Oscillometric Method)
measurements each trial since there are many factors that cause a person’s blood The oscillometric method is a non-invasive means of measuring blood pressure. It is pressure to increase or decrease. Use the following tips to take accurate based on the principle that blood pumped through the arteries by the heart causes the arterial walls to flex. When a cuff (placed around the upper arm to occlude the • The subject’s arm and hand must remain still during measurements. brachial artery) is inflated and then slowly deflated at a constant rate, an arterial pressure pulse forms. These pressure pulses pass from the arteries, through the arm, Proper placement of the pressure cuff will increase the accuracy of your blood pressure measurements. The rubber hoses from the cuff should exit over the brachial artery and 2 cm above the crease in the elbow. When the artery is fully compressed, blood flow stops along with the pulsations. As • For younger students a smaller cuff is available (18 cm to 27 cm). Our small the pressure in the cuff is slowly decreased, the arterial blood pressure increases to blood pressure cuff can be ordered separately: order code XSCUFF. the point that blood is forced through the artery in short pulses. As the pressure in • Remove any clothing that may cover or constrict the portion of the arm being the cuff continues to decrease, more blood flows through the occluded artery and the pulses become increasingly significant until maximum amplitude is reached. Further decrease of the cuff pressure minimizes the occlusion of the artery and the pulses For most individuals it is not necessary to inflate the pressure cuff higher than continue to decrease until the occlusion is removed. 170 mm Hg. Over inflation of the cuff may cause pain and/or injury. • If the pressure release valve is exhausting slower or faster than 2.0–4.0 mmHg /s, then adjust the exhaust rate of the pressure valve. Blood Pressure Sensor Specifications
Maximum pressure without permanent damage These pressure pulses, when separated from the decaying mean pressure of the cuff, form an oscillating waveform (see figure below). The peak-to-peak amplitudes of this waveform create a bell shaped “envelope”. Within the envelope, the amplitudes of the waveform increase through the systolic blood pressure and continue increasing until the mean arterial pressure (MAP) is reached. Physiologically, the cuff pressure corresponding to the maximum amplitude approximates the mean arterial pressure. Generally, the systolic blood pressure is calculated by determining the point along the envelope prior to the MAP using a known percentage of the maximum amplitude. Diastolic blood pressure is calculated using the same method and the portion of the envelope following the MAP. Oscillatory waveform used to create “Envelope” Warranty
Vernier warrants this product to be free from defects in materials and workmanship for a period of five years from the date of shipment to the customer. This warranty does not cover damage to the product caused by abuse or improper use. Vernier Software & Technology
13979 S.W. Millikan Way • Beaverton, OR 97005-2886 Toll Free (888) 837-6437 • (503) 277-2299 • FAX (503) 277-2440 Rev.5/15/07 Logger Pro, Logger Lite, Vernier LabQuest, Vernier LabPro, Go! Link, Vernier EasyLink and other marks shown are our trademarks or registered trademarks in the United States. CBL 2 and CBL, TI-GRAPH LINK, and TI Connect are trademarks of Texas Instruments. All other marks not owned by us that appear herein are the property of their respective owners, who may or may not be affiliated with, connected to, or sponsored by us.

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