1. Psychophysical estimate of plantar vibration sensitivity brings additional information to the detection threshold in young and elderly subjects 
Yves Jammes, Julia Guimbaud, Rémi Faure, Patricia Griffon, Jean Paul Weber, Bruno Vie, Regis Guieu 
Clinical Neurophysiology Practice 
Volume 1, Pages (January 2016)
DOI: /j.cnp
Copyright © 2016 International Federation of Clinical Neurophysiology Terms and Conditions

2. Fig. 1
Schematic representation of the vibration device including the foot support frame, the vibration probe and the load cell measuring the force applied on the foot sole.
Clinical Neurophysiology Practice 2016 1, 26-32DOI: ( /j.cnp )
Copyright © 2016 International Federation of Clinical Neurophysiology Terms and Conditions

3. Fig. 2
Calibration of the vibration amplitude at three vibration frequencies.
Clinical Neurophysiology Practice 2016 1, 26-32DOI: ( /j.cnp )
Copyright © 2016 International Federation of Clinical Neurophysiology Terms and Conditions

4. Fig. 3
Examples of relationships between the estimate (sensation) and amplitude of vibration applied on the heel at two different frequencies in the same participant. The Napierian logarithmic transformation of stimuli and estimation data (right panels) (LnΨ=Lnk+(n*LnΦ) relationship) closely approaches linear regression lines compared to the regression line drawn on pair raw values of vibration estimate and magnitude (expressed in μm) (left panels).
Clinical Neurophysiology Practice 2016 1, 26-32DOI: ( /j.cnp )
Copyright © 2016 International Federation of Clinical Neurophysiology Terms and Conditions

5. Fig. 4
Changes in the vibration detection threshold with aging (Mean value±SEM). A: Only in the younger subjects the vibration detection threshold was significantly lowered when the 150Hz frequency was used to activate the skin afferents in the hallux, 5th metatarsal head, and the heel (symbol #: p<0.05). In the elderly, the vibration detection threshold did not vary with the vibration frequency and was significantly higher than in young subjects in the 5th metatarsal head and the heel (*p<0.05; ***p<0.001). B: Schematic representation of the intergroup differences between the vibration thresholds in the three plantar locations (*p<0.05; ***p<0.001).
Clinical Neurophysiology Practice 2016 1, 26-32DOI: ( /j.cnp )
Copyright © 2016 International Federation of Clinical Neurophysiology Terms and Conditions

6. Fig. 5
Mean value (±SEM) of Lnk and n values of the linear regressions obtained in each participant at each plantar location between the estimate (sensation) and the stimulus. Symbol # indicates that n values measured at the 150Hz vibration frequency were significantly higher than those measured at 25 and 50Hz (#p<0.05; ##p<0.01; ###p<0.001). Asterisks were used to depict significant intergroup differences between n values at the same vibration frequency (*p<0.05; **p<0.01). No difference was measured at the 25Hz frequency.
Clinical Neurophysiology Practice 2016 1, 26-32DOI: ( /j.cnp )
Copyright © 2016 International Federation of Clinical Neurophysiology Terms and Conditions

7. Fig. 6
Linear regressions with 95% confidence intervals obtained between the n coefficient of the LnΨ=Lnk+(n*LnΦ) relationship and the age of participants in response to the 150Hz vibration frequency applied on the hallux, 5th metatarsal head or the heel.
Clinical Neurophysiology Practice 2016 1, 26-32DOI: ( /j.cnp )
Copyright © 2016 International Federation of Clinical Neurophysiology Terms and Conditions

8. Fig. 7
Case report in a patient with altered sensitivity on the course of the left external popliteal nerve due to posterior pinch disk of the 3rd to the 5th lumbar metamere. The n coefficient measured in the three plantar locations was significantly lower in the left 5th metatarsal head and left heel, i.e., at the locations of the altered clinical sensitivity (*p<0.05; **p<0.01; ***p<0.001).
Clinical Neurophysiology Practice 2016 1, 26-32DOI: ( /j.cnp )
Copyright © 2016 International Federation of Clinical Neurophysiology Terms and Conditions