Scientific/Clinical Article| Volume 20, ISSUE 4, P300-308, October 2007

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Similar Motion of a Hand-held Object may Trigger Nonsimilar Grip Force Adjustments


      The tight coupling between load (L) and grip (G) forces during voluntary manipulation of a hand-held object is well established. The current study is to examine grip–load force coupling when motion of the hand with an object was either self-generated (voluntary) or externally generated. Subjects performed similar cyclic movements of different loads at various frequencies with three types of manipulations: 1) voluntary oscillation, 2) oscillating the right arm via the pulley system by the left leg (self-driven oscillation), and 3) oscillating the arm via the pulley system by another person (other-driven oscillation). During the self-generated movements: 1) the grip forces were larger and 2) grip–load force modulation was more pronounced than in the externally generated movements. The GL adjustments are not completely determined by the mechanics of object motion; nonmechanical factors related to movement performance, for instance perceptual factors, may affect the GL coupling.
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      JHT Read for Credit

      Quiz: Article #073

      Record your answers on the Return Answer Form found on the tear-out coupon at the back of this issue. There is only one best answer for each question.
      • #1.
        The authors suggest that their data/findings may have clinical implication when measuring
        • a.
          unilateral interosseous muscle strength
        • b.
          bilateral interosseous muscle strength
        • c.
          static Jamar grip
        • d.
          rapid exchange grip
      • #2.
        Voluntary grip force is most influenced by the
        • a.
          direction of movement of the hand and object during an activity
        • b.
          speed of movement of the hand and object during an activity
        • c.
          perceived risk of dropping the object
        • d.
          size of the object
      • #3.
        The subject study sample consisted of
        • a.
          healthy males, mostly in their 20s and 30s
        • b.
          healthy females, mostly middle aged
        • c.
          non-neurological patients
        • d.
          a combination of neurological and orthopaedic patients
      • #4.
        The results suggest that there is
        • a.
          a feed-constant control of grip force
        • b.
          a feed-forward control of grip force
        • c.
          a constant grip force at all positions
        • d.
          a rectilinear relationship of grip force to position
      • #5.
        Grip-load (G-L) adjustments are entirely determined by mechanical factors
        • a.
        • b.
      When submitting to the HTCC for re-certification, please batch your JHT RFC certificates in groups of 3 or more to get full credit.