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FL and FV curves for spastic (CP) muscle

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  • FL and FV curves for spastic (CP) muscle

    Hello Biomch-L readers,

    I am in need of some information regarding the force-length and
    force-velocity properties related to spastic muscle, particularly related
    to children with Cerebral Palsy. I am interested in modelling dynamic
    contraction of muscle based on EMG values and force as a function of
    muscle velocity and length. Apparently from readings, CP muscle will
    have different properties (ie. shorter muscle, longer tendon, higher
    distribution of type-I fibres, and fewer sarcomeres in series). I
    initially planned on using dimensionless curves of FL and FV as proposed
    by Zajac (1989) and recently available on the Biomechanics Web site (ISB)
    from Scott Delp.

    I would like some clarification as to whether these dimensionless curves
    are applicable to the case of spastic (cp) muscle, and if they are how
    might they be scaled. If these curves are not applicable to the spastic
    muscle, is there anyone that has this data or know of its publication?

    One other question of note, is if the dimensionless Force-Velocity curve
    is scaled or proportional to the percentage of slow/fast fibres.


    Zajac, F.E. (1989) Muscle and tendon: properties, models, scaling and
    applications to biomechanics and motor control. CRC Crit Rev Biomed Eng

    O'Dwyer, N.J. et al. (1989) Mechanisms of muscle growth related to
    muscle contracture in cerebral palsy. Dev Med Child Neurol 31, 543-552.

    Dietz, V., and Berger, W. (1995) Cerebral Palsy and Muscle
    Transformation. Dev Med Child Neurol 37, 180-184.

    Rose, J. et al. (1994) Muscle pathology and clinical measures of
    disability in children with cerebral palsy. J. Orthop. Res 12:758-768.


    Alan Morris, MASc.
    Research Engineer - Gait Laboratory
    Bloorview MacMillan Centre
    350 Rumsey Road
    Toronto, Ontario
    Tel (416) 425-6220 x3508
    Fax (416) 425-1634