Abstract
Anticipatory postural adjustments (APAs) represent the feedforward mechanism of neuromuscular control essential for maintaining balance under predictable perturbations. The importance of vision as a distal sensory modality in the generation of APAs is well established. However, the capabilities of external cues in generating APAs are less explored. In the present study, vibratory cue was investigated for its reliability among healthy individuals in generating anticipatory response under external perturbation in the absence of vision. Ten participants, in quiet stance, were provided with external perturbation in the form of pendulum impact in anterior–posterior (AP) direction under conditions of: both vision and vibratory cue absent; vision present but vibratory cue was absent; vision and vibratory cue both were present; only vibratory cue is present with vision being absent. EMG activities of the leg muscles and displacement of center of pressure (COP) in AP direction were recorded. The data were later analyzed and quantified in the time frame of anticipatory and compensatory phases. The results showed that with training, participants were able to generate significant APAs relying on the vibratory cue alone. Improvement in APAs was accompanied by minimizing the need for larger CPA and improved stability (COP displacement) under perturbation. The study outcome indicates the possibility of using vibratory cues for APA-based interventions.
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This work was conducted with the facility built using the support from corresponding author’s Institute, DST, SERB, and MHRD Research Award.
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SB: methodology, software, validation, investigation, formal analysis, data curation, visualization, and writing—original draft preparation. VN: conceptualization, investigation, and formal analysis. VV: supervision, methodology, and writing—reviewing and editing.
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Bhardwaj, S., Negi, V. & Vashista, V. Vibratory cue training elicits anticipatory postural responses to an external perturbation. Exp Brain Res 240, 1105–1116 (2022). https://doi.org/10.1007/s00221-022-06313-x
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DOI: https://doi.org/10.1007/s00221-022-06313-x