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    Happy holidays to all subscribers. One of our students is interested
    in measuring muscle cocontraction of shoulder muscles as subjects perform
    closed chain activities such as the push-up. EMG data will be acquired from
    antagonist muscles such as the anterior and posterior deltoid muscles.
    Several methods have been considered for the operational definition of
    cocontraction, including the suggestion of Falconer and Winter:

    Common Area of Muscles A and B
    % Cocontraction = 2 X ------------------------------- X 100%
    Area Muscle A + Area Muscle B

    The areas in question in this formula are the areas under the full-wave
    rectified, demeaned, linear envelope signals for each muscle.
    We would appreciate any information from subscribers regarding the pros
    and cons of using this or other operational definitions of muscle
    cocontraction. A summary of responses will be posted, as usual. Best regards,

    Michael Gross
    CB #7135
    Division of Physical Therapy
    Univeristy of North Carolina at Chapel Hill
    Chapel Hill, NC 27599-7135

    EMAIL Address: