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Biarticular leg muscles during squat.

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  • Biarticular leg muscles during squat.

    Hello fellows, my name is Sergio and I am a graduating physical
    therapist here in Brazil. I am having a discussion with my comrades to
    which I need help. They say that during the raising phase (geting up) of
    the squat, the simultaneous contaction of the hamstrings and
    gastrocnemius helps to extend the knee (contributing to the quadriceps
    action). I believe that the contraction of those muscles actually try to
    flex the knee (although the knee is extending, of course). Their real
    action is on the pelvis (hamstring) and ankle (gastrocnemius).
    So, who is right? Me or them?
    I would be pleased if someone can help. It would be very useful
    a reference of some article or text about this problem. Thanks...

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