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    Postural reorientation does not cause the locomotor after-effect following rotary locomotion

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    Authors
    Osler, Callum J.
    Reynolds, Raymond Francis
    Affiliation
    University of Birmingham, School of Sport and Exercise Sciences, College of Life and Environmental Sciences
    Issue Date
    2012
    
    Metadata
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    Abstract
    After a period of stepping on a rotating platform, blindfolded subjects demonstrate a tendency to unconsciously turn when stepping in place, an after-effect known as podokinetic after-rotation (PKAR). Recent studies have also reported a change in postural orientation following the adaptive period and have suggested that this is causally related to PKAR. Here, we assess changes in trunk orientation following platform adaptation and determine their relationship to PKAR. Specifically, we determine whether a reorganized standing posture causes PKAR. Ten subjects stepped on a platform rotating at 60deg/s for 10 min, with a cadence of 100 steps/min. Following adaptation, a significant PKAR response was seen, with a mean yaw rotation velocity of 6.0 ± 2.2deg/s. In addition to this dynamic after-effect, there was a significant twist of the trunk with respect to the feet when standing still (6.9 ± 4.5deg; mean ± SD), confirming the presence of a postural reorientation after-effect. However, the magnitudes of the two after-effects did not correlate (r = 0.06, p = 0.87). Furthermore, in a second experiment, a prolonged passive twist of the trunk was used to induce postural reorientation. However, in this case, PKAR was not induced. These results demonstrate that PKAR is not an automatic consequence of reorganized standing posture.
    Citation
    Postural reorientation does not cause the locomotor after-effect following rotary locomotion 2012, 220 (3-4):231 Experimental Brain Research
    Publisher
    Springer
    Journal
    Experimental Brain Research
    URI
    http://hdl.handle.net/10545/304847
    DOI
    10.1007/s00221-012-3132-6
    Additional Links
    http://link.springer.com/10.1007/s00221-012-3132-6
    Type
    Research Report
    Language
    en
    ISSN
    0014-4819
    1432-1106
    ae974a485f413a2113503eed53cd6c53
    10.1007/s00221-012-3132-6
    Scopus Count
    Collections
    Human Sciences Research Centre

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