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muscle spindle question

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  • muscle spindle question

    For my PhD dissertation, I have to review the role of muscle
    spindle in position sense. This role is well established with,
    for example, vibration experiments as well as other psychophysical
    experiments. Now, when looking at papers including microneurographic
    recordings of spindle responses, I did not find any answer to the
    following question:

    Is there any microneurographics evidence showing that the static
    component of spindle response depends on position in a ramp-and-hold
    task in humans for passive or active movements?

    I would appreciate any pointers toward a recent assessement of this
    issue. The only paper I know that address specifically this issue with
    active tracking task shows that it is not the case (Vallbo,
    Hulliger and Nordh, 1981, Brain Research, 204).
    However, for isolated muscle, the static component of spindle activity
    depends on position (in the cat, Matthews 1964, 1972; Hunt and Kuffler,
    1951). In fact, during the ramp, the variation of spindle activity appear
    closely related to the variation in the velocity profile (Vallbo, 1981).

    Can I conclude that muscle spindle do not provide direct information
    on the position (muscle lenght) and that this one must be derived by
    integration of the velocity signal (plus, of course, info coming from
    joint and cutaneous receptors, Golgi organs, corrolary discharge)?

    Thank you,

    Gabriel Baud-Bovy

    Gabriel Baud-Bovy
    Université de Genève, FAPSE tel. +41 22 705 97 67
    9, route de Drize fax +41 22 300 14 82
    1227 Carouge, Switzerland home tel. +41 22 320 21 38

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