The VibroSense Meter records Vibration Perception Thresholds (VPT) at different frequencies with an automatic comparison with an age-dependent normal population. The age reference comparison is very important since the sense of touch (just like the hearing) diminishes with age.
The principle of measurement is very similar to a hearing test (audiometry), but instead of utilising sound, the VibroSense Meter uses mechanical vibrations. The patient first places one finger on a small "vibrating probe" that vibrates with different intensities and frequencies. The patient then presses (and holds down) a button held in the other hand for as longs a s/he can perceive vibrations. The test is both quick (it takes about 3-4 minutes per finger) and easy to perform.
The result is presented as a Vibrogram curve, showing if the sense is normal or if there are any signs of incipient damage. The curve for each frequency in the vibrogram takes the form of a zigzag pattern and the Vibro Perception Threshold is calculated as the mean value of the peaks and valleys of the curve. The Psychophysical algorithm corresponds to a modified von Békésy up/down algorithm.
A comprehensive test with the VibroSense Meter includes multi-frequency vibrometry of two fingers on each hand and a questionnaire, which is integrated with the PC program. The VibroSense Meter can also be used for screening purposes in which case a faster version of the method is used.
Research at the University hospitals of Lund and Malmö (Professor Göran Lundborg et al.) has shown that the VibroSense Meter can detect changes earlier than other methods. Early detection increases the chance of avoiding permanent injury.