No announcement yet.

Proper model for golf swing

This topic is closed.
  • Filter
  • Time
  • Show
Clear All
new posts

  • Proper model for golf swing

    Dear BIOMECH-L subscribers,

    Currently, I am working on a project which involved the computation of
    joint resultant torque and force at the L4-L5 level during a golf swing.
    Generally, the inverse dynamics method with ground reaction force (GRF) is
    used to calculate these parameters. However, as Dr. Dapena and Dr. Hatze
    mentioned these problems last June (1996), this approach may produce a lot
    of errors (for example, the errors from joint center digitization, from
    estimation of center of mass of each segment, and etc.). The linear and
    angular velocities and accelerations from the first and second derivatives
    of the displacements would be another source of error.
    If then, my questions are:

    a) Can I use static (or quasi-static) model with GRF to calculate joint
    resultant torque and force at L4-L5? In my case, the golf swing is a kind
    of closed loop kinetic chain motion(?). In other words, two feet are on
    the ground during the motion. So the influences of moment of inertia and
    linear acceleration of each segment would be minimal. I think, the error
    occurring from using this static model could compromise the error
    introduced from the inverse dynamics approach.

    b) What is the definition of quasi-static model? Is this as same as
    quasi-dynamic model?

    As always, I will post a summary of responses. Thanks in advance.

    Sincerely yours,


    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~
    Young-tae Lim

    Department of Kinesiology Tel: (217) 333-6398
    241 Louise Freer Hall (MC-052) Fax: (217) 244-7322
    960 S. Goodwin Ave. E-mail:
    University of Illinois
    Urbana, IL. 61801
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~