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Re: BIOMCH-L Digest - 25 Aug 2004 to 26 Aug 2004 (#2004-173)

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  • Re: BIOMCH-L Digest - 25 Aug 2004 to 26 Aug 2004 (#2004-173)

    For mammalian muscle the classic is cat soleus by Joyce, Rack and
    Westbury 1969 J Physiol.
    For rabbit, I would check with Rick Lieber at San Diego, who has
    certainly done eccentric contractions in rabbits.

    The general problem of course is that a tension-velocity is not such a
    good approximation to real behaviour in mammalian muscle as in single
    frog fibres. That is the tension is not so nearly constant for a
    constant velocity and vice versa. The explanation of this is likely to
    include contributions from the passive elements and their
    interdependence (higher passive tension and series compliance, length
    of parallel elastic element depends on length of series elastic element
    and hence on tension) as well as a mixture of sarcomere lengths within
    a whole muscle (some fibres are still less than optimum when the whole
    muscle is beyond) and possibly greater dispersion of sarcomere lengths
    within fibres.

    David Morgan

    On 27/08/2004, at 8:00 AM, Automatic digest processor wrote:

    > From: David Corr
    > Date: 26 August 2004 8:27:29 AM
    > Subject: eccentric force-velocity curve
    > Does anyone know where I could find the eccentric force-velocity
    > relation
    > for the rabbit Tibialis Anterior skeletal muscle, or other rabbit whole
    > skeletal muscles. I have found the F-V relation for shortening
    > movements,
    > but I exhausted my available references (library, PUBMED, etc.) and
    > have not
    > yet found any work regarding lengthening. Any assistance on this
    > would be
    > greatly appreciated.
    > Thank you,
    > David
    > ____________________________________________
    > David T. Corr, Ph.D.
    > The McCaig Centre for Joint Injury and Arthritis Research
    > University of Calgary

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