Normative Values of Vibration Perception Threshold (VPT) In Young Adults

Abstract

Background: Impaired vibratory perception is an early, frequent finding in
various neuropathies. Though normative data for Vibration Perception
Threshold (VPT) is documented in elderly adults, no such data is available in
young adults.
Aim: To obtain normative values for the VPT in the lower extremities, to
evaluate VPT variability between the sites, sides and to study the correlation of
VPT with sex and BMI in healthy young adults.
Methods: 80 healthy young adults (35 males and 45 females), aged 18-25 yrs
(21.09±3.69yrs) were recruited from the student population of M.S.Ramaiah
Medical College. VPTs were measured using Sensitometer-VPT, at 16 specific
sites in both the lower extremities. The Sensitometer Probe was applied over
predetermined sites and voltage was steadily increased. The voltage at which
the subject experienced the sensation of vibration was noted (Simple Up/Down
method). The mean of 3 readings at each site was considered for analysis. Mean
vibration thresholds were compared by student t-test.
Results: The range for VPT values found was 4.97-12.98 volts. (2.5th
- 97.5th
percentile). There was no significant difference in the VPT values between sites
and the right and left sides. Also there was no significant correlation of VPT
with sex and BMI (P>0.05).
Conclusion: These normative values of VPT can serve as a basis for future
clinical applications of VPT measurements in young adults.