Volume 5 Supplement 1

3rd Congress of the International Foot and Ankle Biomechanics Community

Open Access

Plantar foot vibration thresholds: a comparison between measurements with seated and standing subjects

Journal of Foot and Ankle Research20125(Suppl 1):O23

DOI: 10.1186/1757-1146-5-S1-O23

Published: 10 April 2012

Background

The importance of the somatosensory information from the plantar foot area for balance control is well reported in the literature. Usually, tests for touch and vibration sensitivity are performed with subjects in sitting or supine position [1]. However, balance tests are measured in standing position [2]. Therefore the aim of this study was to compare vibration thresholds measured with subjects seated and during standing.

Materials and methods

Sixty-six healthy subjects of both genders with a mean age of 22.1 (± 3.2) years participated in this study. Vibration perception thresholds [µm] were measured at 200Hz in two conditions: sitting (90 ° knee angle) and standing on both legs. Five measurements with increasing amplitude were performed at each of the three analyzed anatomical locations of the right plantar foot: heel, first metatarsal head (MET I) and hallux. The contact force between the vibration probe and the anatomical locations as well as foot temperature were controlled throughout the experiments. Body position and anatomical locations were randomized between the subjects.

Results

The contact forces between the probe and the location were higher for standing in comparison to sitting condition (27, 7% hallux, 43, 2% Met I and 62, 6% Heel). However, no significant differences in vibration thresholds between standing and sitting conditions were found in any of the analysed anatomical locations (Figure 1).
https://static-content.springer.com/image/art%3A10.1186%2F1757-1146-5-S1-O23/MediaObjects/13047_2012_Article_390_Fig1_HTML.jpg
Figure 1

Vibration thresholds for the standing and sitting conditions.

Conclusions

Cassella et al. (2000) demonstrated that greater contact forces between the probe and the location being analysed are reducing vibration thresholds. However, despite the higher force applied by the probe during standing, no significant differences between the tested positions were evaluated in the present study. It seems that the standing position affects the perception of vibration stimuli, since subjects need to concentrate on different tasks, e.g. keep their balance. This could explain the lack of differences between thresholds measured in the different positions, although contact forces increased during standing.

Authors’ Affiliations

(1)
Department of Human Locomotion, Chemnitz University of Technology

References

  1. Dietz V: Human neuronal control of automatic functional movements: interaction between central programs and afferent input. Physiol Rev. 1992, 72: 33-69.PubMedGoogle Scholar
  2. Chiang JH, Wu G: The influence of foam surfaces on biomechanical variables contributing to postural control. Gait Posture. 1997, 5: 239-245. 10.1016/S0966-6362(96)01091-0.View ArticleGoogle Scholar
  3. Cassella JP, Ashford RL, Kavanagh-Sharp V: The effect of applied pressure in the determination of vibration sensitivity using the neurothesiometer. The Foot. 2000, 10: 27-30. 10.1054/foot.2000.0575.View ArticleGoogle Scholar

Copyright

© Germano et al; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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