The hypothesis that exposure to prolonged free fall is a form of sensorymotor rearrangement rather than a direct change in otolith sensitivity or sensory compensation for a reduced otolith input is discussed. Data from Spacelab-1 experiment 1NS-104 are presented to support an otolith reinterpretation hypothesis. This experiment measured vestibulo-spinal reflex changes as a function of sustained free fall. Findings indicate that when a monosynaptic reflex (H-reflex), measured from the major postural muscles (soleus) is used, adaptation to space flight includes a change in how the central nervous system interprets a fall. In a normal gravity environment a sudden unexpected fall produces a potentiated H-reflex. After 7 days inflight, an equivalent fall does not potentiate the reflex. Postflight a greatly increased reflex is observed in those crewmen most susceptible to space motion sickness.


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    Titel :

    The adaptation of vestibulo-spinal reflexes as a function of spaceflight and their relationship to space motion sickness


    Beteiligte:
    Reschke, M. F. (Autor:in) / Anderson, D. J. (Autor:in) / Homick, J. L. (Autor:in) / Baker, J. T. (Autor:in) / Wood, S. J. (Autor:in) / Crosier, W. G. (Autor:in)


    Erscheinungsdatum :

    1984-08-01


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Effect of Spaceflight on Vestibulo-Ocular Reflexes (VORS) During Angular Head Motion

    Tomko, David L. / Clifford, James O. / Hargens, Alan R. | NTRS | 1996


    Spatial Transformation of the Vestibulo-Ocular during Spaceflight

    Clement, G. / Wood, S. J. / Reschke, M. F. | British Library Online Contents | 1996


    Motion sickness induced by g-transitions during spaceflight

    Scott Wood / Gilles Clément / Millard Reschke | NTRS | 2022


    Vestibulo-spinal reflex mechanisms

    Reschke, M. F. | NTRS | 1981


    Studies of the horizontal vestibulo-ocular reflex in spaceflight

    Thornton, William E. / Uri, John J. / Moore, Tom et al. | NTRS | 1989