NIBP100A blood pressure measurements will differ depending on whether the sensor is placed lower or higher than the subject’s heart (sensor height relative to the subject’s heart). This is natural and expected. In order to eliminate this potential problem, you have to ensure that the sensor is at the same height for all subjects and that this level approximates heart level as closely as possible.
- One simple technique is to insert a pen under the subject’s armpit with the pen being parallel to the ground and keep the sensor at the level of the pen.
- Another option is to place the subject’s arm in a sling because this will help to maintain the same height during the course of the test.
Alternatively, the NIBP100A has settings that can compensate for differences in the sensor height. Please consult the NIBP100A manual for details.
Whenever the NIBP100A does not manage to get a reading from the subject it will plot a flat line. The NIBP100A tries to take a reading as often as possible. When it takes a reading it outputs the pulse waveform for the reading and replicates it until it is able to take another reading. The system takes a new blood pressure reading every 10-15 beats of the heart. If it fails to take another reading, it gives you a straight line from the time it failed until it takes another reading.
If you are unable to get an analog output signal from the NIBP100A, but the unit is measuring and displaying BP values on the front panel, the problem might be related to the Data Port setting. The analog output signal comes from the NIA V-Line interface that attaches to the data port on the rear of the unit. The analog output signal is only accessible if the device is set to no printer mode.
The Printer mode is identified when you first start the unit. The display will indicate whether the printer mode is set to one of three options: None / GSD / HP.
To change the mode so the unit will output the analog signals through the NIA V-Line interface:
Turn the unit off.
Hold down the Start/Stop button (hold down while you turn the unit on) and turn the unit back on.
Repeat the cycle until the display shows that the Printer mode is set to None.
Many studies use hand dynamometry to objectively quantify exerted effort during experiments most commonly related to the study of motivation.
We’ll focus on this topic and go over everything you need to know to record dynamometry data in the MRI or in the lab. Topics include
– Calibrating for maximum voluntary contraction (MVC)
– Real-time access to the dynamometer signal by third-party applications
– How researchers have used this equipment
– Creating a visual task that gives feedback on exerted effort as well as rewards to the participant
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