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J Neurophysiol 79: 143-150, 1998;
0022-3077/98 $5.00
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The Journal of Neurophysiology Vol. 79 No. 1 January 1998, pp. 143-150
Copyright ©1998 The American Physiological Society

Vibration-Induced Postural Posteffects

M. M. Wierzbicka1, J. C. Gilhodes2, and J. P. Roll2

1 Brockton/West Roxbury Veterans Affairs Medical Center and Department of Neurology, Harvard Medical School, Boston, Massachusetts 02132; and 2 Laboratory of Human Neurobiology, Centre National de la Recherche Scientifique 372, University of Provence, 13397 Marseilles Cedex 20, France

Wierzbicka, M. M., J. C. Gilhodes, and J. P. Roll. Vibration-induced postural posteffects. J. Neurophysiol. 79: 143-150, 1998. It generally is known that vibration of various muscles in free-standing subjects evokes a spatially oriented postural response. Furthermore, it recently has been shown that when a vibratory stimulus is terminated, a powerful involuntary contraction of the previously vibrated muscle often occurs that, under the isotonic condition, is accompanied by movement of a limb. The aim of this study was to explore effects of a low-amplitude mechanical vibration, applied in a seated position, on the standing posture. The 30-s vibration was applied bilaterally at the ankle level to anterior or posterior tendons and at the cervical level in front or back of the neck, at one site only at a time. Center of pressure trajectories were monitored during quiet stance for <= 19 min after the offset of vibration, and these measurements were compared with a previbration control trial. The results clearly indicate that vibration produced in all subjects strong, long-lasting dynamical modification of posture mainly in the anterior-posterior direction. Spatial orientation of the induced postvibratory shift in posture was dependent on the vibration side. We conclude that sustained Ia sensory inflow, evoked by vibration, has a powerful after-effect on the motor system at the postural level.




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