Vernier Tech Info Library TIL #2038

Question

How can I get better recordings using the Hand-Grip Heart Rate Monitor

Answer

There are several things that you can do to increase the quality of recordings that you get from the Hand-Grip Heart Rate Monitor, order code HGH-BTA, $119.00.

1) Make sure that you are holding the sensor in the right orientation. See the arrow and location of the hands on the wireless sensor.

2) Make sure that the receiver is plugged into the LabQuest and that it positioned properly. See the arrow on the receiver.

3) Verify that the heart rate signal trace visible. If the heart rate signal (a large spike) is not visible during recording then there is either a problem with the sensor or a problem with the subject. In a few cases (less than 12%) the subject�s skin may not be conductive enough to pick up a good heart rate signal. Abrasive / conductive electrode gel may need to be used in this case. The easiest way to test if the problem is with the individual is to record heart rate from another person. If you get a good HR signal from another subject, skin conductivity is the problem.

4) If you are using a LabQuest the heart rate signal is not shown unless you select it. Go to Graph, select Show Graph and then click on the box for All Graphs. The Lab Quest will now show you the HR signal while it calculates / displays hear rate data. Before you begin an HR experiment its important to verify that the LabQuest is recording the HR signal. Collect some data and verify that the Heart Rate monitor is recording each beat from the subjects heart.

5) If the signal from the Hand-Grip Heart Rate Monitor is noisy or fluctuates up and down rapidly something may be interfering with the signal. Make sure that the receiver is positioned away from computers, power supplies, cell phones or other devices that can cause electrical interference.

Created by: jmelville on July 13 2009
Last updated by: jhopkins on July 16 2009