Head position-based electrotactile tongue biofeedback affects postural responses to Achilles tendon vibration in humans |
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Authors: | Nicolas Vuillerme Rémy Cuisinier |
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Institution: | (1) Laboratoire TIMC-IMAG, UMR UJF CNRS 5525, Faculté de Médecine, 38706 La Tronche cédex, France |
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Abstract: | The purpose of the present experiment was to investigate whether postural responses to ankle proprioceptive perturbation Achilles
tendon vibration were affected by the availability of augmented sensory information about head orientation/motion with respect
to gravitational vertical, i.e., normally provided by the vestibular system. To achieve this goal, ten standing subjects were
exposed to Achilles tendon vibration in two No Biofeedback and Biofeedback conditions. The No Biofeedback condition served
as a control condition. In the Biofeedback condition, subjects performed the postural task using a head position-based electrotactile
tongue-placed biofeedback system. Center of foot pressure (CoP) displacements were recorded using a force platform. Results
showed that (1) Achilles tendon vibration increased CoP displacements in the No Biofeedback condition and (2) this destabilizing
effect was less accentuated in the Biofeedback condition. These results are consistent with and discussed in terms of sensory
re-weighting mechanisms involved in postural control. In the condition of Achilles tendon vibration, which renders ankle proprioceptive
information less reliable for controlling posture, the central nervous system was able to integrate alternatively available
augmented sensory information suitable and usable in upright postural control to reduce the destabilizing effect of the ankle
proprioceptive perturbation. |
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Keywords: | Sensory re-weighting Balance Tendon vibration Biofeedback Tongue display unit |
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