caa a22 4500 445352507 CHVBK 20180317142848.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00221-011-2792-y doi (NATIONALLICENCE)springer-10.1007/s00221-011-2792-y Responses to Achilles tendon vibration during self-paced, visually and auditory-guided periodic sway [Elektronische Daten] [Saritha Radhakrishnan, Vassilia Hatzitaki, Dimitrios Patikas, Ioannis Amiridis] Achilles tendon vibration (ATV) alters proprioceptive input of the triceps surae muscles resulting in a posterior postural shift during standing. When this is applied in combination with a more dynamic proprioceptive perturbation, postural responses to ATV are attenuated. In this study, we applied ATV during self-paced, visually and auditory guided voluntary periodic sway in order to examine how the vibration-induced afferent input is processed and reweighted at the presence of inter-sensory guidance stimuli. Seventeen healthy adults (aged 26.7±4.23years) performed 15 cycles of periodic sway under three sensory guidance conditions: (a) self-paced, (b) auditory paced (0.25Hz), and (c) visually driven by matching the resultant force vector to a target sine-wave (0.25Hz). Bilateral ATV (80Hz, 3mm) was applied between the 5th and 10th sway cycles. ATV evoked an earlier burst onset and increased activity of the plantarflexors consistent with a reduction in the amplitude and duration of forward sway. This in turn resulted in an increase in dorsiflexors' activity in order to compensate for the greater backward sway. Postural responses to ATV were augmented when sway was auditory and visually guided. Forward sway variability increased with ATV and remained high while backward sway variability decreased in the post-vibration phase. Our results suggest that sensory context-dependent constraints that determine the degree of active control of posture and associated postural challenge involved in a particular task determine how the vibration-induced Ia afferent input will be registered and further processed by the central nervous system. Springer-Verlag, 2011 Proprioception nationallicence Posture nationallicence Sensory integration nationallicence Voluntary sway nationallicence Radhakrishnan Saritha Department of Physical Education and Sport Science, Laboratory of Motor Control and Learning, Aristotle University of Thessaloniki, 546 24, Thessaloniki, Greece aut Hatzitaki Vassilia Department of Physical Education and Sport Science, Laboratory of Motor Control and Learning, Aristotle University of Thessaloniki, 546 24, Thessaloniki, Greece aut Patikas Dimitrios Department of Physical Education and Sport Science at Serres, Laboratory of Neuromechanics, Aristotle University of Thessaloniki, Thessaloniki, Greece aut Amiridis Ioannis Department of Physical Education and Sport Science at Serres, Laboratory of Neuromechanics, Aristotle University of Thessaloniki, Thessaloniki, Greece aut Experimental Brain Research Springer-Verlag 213/4(2011-09-01), 423-433 0014-4819 213:4<423 2011 213 221 https://doi.org/10.1007/s00221-011-2792-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2792-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Radhakrishnan Saritha Department of Physical Education and Sport Science, Laboratory of Motor Control and Learning, Aristotle University of Thessaloniki, 546 24, Thessaloniki, Greece aut NATIONALLICENCE 700 1- Hatzitaki Vassilia Department of Physical Education and Sport Science, Laboratory of Motor Control and Learning, Aristotle University of Thessaloniki, 546 24, Thessaloniki, Greece aut NATIONALLICENCE 700 1- Patikas Dimitrios Department of Physical Education and Sport Science at Serres, Laboratory of Neuromechanics, Aristotle University of Thessaloniki, Thessaloniki, Greece aut NATIONALLICENCE 700 1- Amiridis Ioannis Department of Physical Education and Sport Science at Serres, Laboratory of Neuromechanics, Aristotle University of Thessaloniki, Thessaloniki, Greece aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 213/4(2011-09-01), 423-433 0014-4819 213:4<423 2011 213 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer