Postural leaning direction challenges the manifestation of tendon vibration responses at the ankle joint |
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| Affiliation: | 1. Laboratory of Motor Control and Learning, Department of Physical Education and Sport Science, Aristotle University of Thessaloniki, Greece;2. Laboratory of Neuromechanics, Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Greece;1. Department of Mechanical Engineering, Stanford University, United States;2. Department of Bioengineering, Stanford University, United States;1. Vrije Universiteit Brussel, Faculty of Physical Education and Physiotherapy, Pleinlaan 2, 1050 Brussel, Belgium;2. Vrije Universiteit Brussel, Faculty of Sciences and Bio-engineering, Pleinlaan 2, 1050 Brussel, Belgium;3. Universiteit Antwerpen, Faculty of Applied Engineering, Groenenborgerlaan 171, 2020 Antwerpen, Belgium;4. Thim Van Der Laan University College Physiotherapy, Weststrasse 8, 7302 Landquart, Switzerland;1. Department of Physical Education and Sports, University of Valencia, Valencia, Spain;2. School of Kinesiology, University of Minnesota, USA;1. Department of Psychology, Johannes Gutenberg-University, Mainz, Germany;2. Toronto Rehabilitation Institute, University Health Network (UHN), iDAPT, Toronto, ON, Canada;3. University of Toronto, Institute for Aerospace Studies, Toronto, ON, Canada;4. Department of Psychosomatic Medicine and Psychotherapy, University Medical Center, Johannes Gutenberg-University, Mainz, Germany;5. Department of Psychology, Ryerson University, Toronto, ON, Canada;1. Section of Psychiatry, Department of Clinical, Diagnostic, and Public Health Medicine, University of Modena and Reggio Emilia, Modena, Italy;2. Section of ENT, Department of Clinical, Diagnostic, and Public Health Medicine, University of Modena and Reggio Emilia, Modena, Italy;3. Centre for Youth Mental Health, University of Melbourne, Melbourne, Victoria, Australia |
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| Abstract: | In this study, we examined the interaction between central and peripheral proprioceptive afferent pathways by applying ankle tendon vibration during postural leaning in different directions. Twenty young participants stood for 60s over the midline of two adjacent force platforms in (a) neutral stance distributing Body Weight (BW) equally between the platforms, (b) forward leaning transferring 80% of BW to the front platform and (c) backward leaning transferring 80% of BW to the rear platform. Participants controlled the degree of leaning by receiving on-line visual feedback of BW distribution matched to a target line. Vibration (80 Hz, 1.5–1.8 mm) was applied over the Achilles or tibialis anterior tendon during the middle 20s of standing. This induced a postural shift towards the vibration side and an increase in the variability of the BW distribution that was greater in backward compared to forward leaning. EMG responses to tendon vibration were independent of the leaning direction. Antagonistic activity also increased in response to vibration, the amplitude of this increase however was direction dependent. These results favor the hypothesis about the central co-modulation of the vibration evoked proprioceptive inflow based on postural and visual feedback rather than muscle tension constraints. |
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| Keywords: | Proprioception Posture Visual feedback Sensory integration |
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