The
QMT System: How Does It Work?
3. Collecting Data
The
QMT System: How Does It Work?
3. Collecting Data
3a. Starting TestTesting is initiated by pressing the remote hand switch and terminated automatically after 5 seconds. During the test the patient is instructed to pull as hard as possible on the load strap. An audible tone is emitted from the computer speaker and increases pitch the harder the pull. A large colored bar appears on the monitor screen and rises in length the harder the pull. These two feedback techniques prompt the patient to pull as hard as possible, particularly for younger children. |
3b. The Tare ProcedureA novel option to the testing procedure is the "tare" procedure. Usually the patient does not pull on the load cell in the direction anticipated. In order to eliminate off axis loading the QMT is supplied with a stabilizing strap. Assuming a test of the knee flexors, the load strap would be fixed anterior to the leg and the stabilizing strap posterior to the leg. Each strap is tightened against each other by use of the "cam" locks with the leg held at rest in the middle. This procedure pre-loads the load strap and the "tare" command is used to zero the load cell. Initiation of the test with the hand switch the records any additional load the patient exerts on the load strap. The stabilizing strap maintains the load line in the desired direction. |
Immediately after each test the data is presented in both visual and tabular form. Visual presentation is an X-Y plot with X axis as time and Y axis as force. Tabular presentation includes Maximum force, average force, 50% rise time and force at beginning of the test, the first, second, third, fourth and fifth second.
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