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Measurement of Spatial Stability in Precision Grip
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Published on: June 4, 2020

Force coordination in static manipulation tasks performed using standard and non-standard grasping techniques.

Paulo B de Freitas1, Slobodan Jaric

  • 1Human Performance Lab, Department of Health, Nutrition, and Exercise Sciences, University of Delaware, 547 South College Avenue, Newark, DE 19716, USA.

Experimental Brain Research
|February 28, 2009
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Summary

Hand grip force (GF) and load force (LF) coordination is similar across standard and non-standard grasps. However, adjusting GF for object friction varies significantly between different hand grasps, impacting manipulation control.

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Area of Science:

  • Biomechanics
  • Motor Control
  • Human Factors Engineering

Background:

  • Understanding hand-object manipulation is crucial for prosthetics and robotics.
  • Force coordination between grip force (GF) and load force (LF) is fundamental to stable grasping.
  • Investigating non-standard grasps reveals adaptability of the human motor system.

Purpose of the Study:

  • To evaluate hand grip force (GF) and load force (LF) coordination across various grasping techniques.
  • To determine if the nervous system adjusts GF to different friction coefficients across grasps.
  • To compare force coordination in standard (precision, palm) versus non-standard (wrist, fist) grasps.

Main Methods:

  • Thirteen participants performed sinusoidal load force patterns with standard and non-standard grasps.
  • Grip force and load force coordination indices were measured.
  • Grip force adjustments relative to skin friction coefficients were analyzed.

Main Results:

  • Force coordination indices were largely similar across standard and non-standard grasping techniques.
  • Grip force adjustments to friction varied; lowest in precision grasp, highest in palm grasp.
  • Inconclusive results regarding grip force adjustments to friction across different grasps.

Conclusions:

  • The coordination of grip force and load force observed in standard grasps generalizes to non-standard techniques.
  • The ability to adjust grip force for friction is not fully generalizable across different hand grasps.
  • Future research should explore dynamic tasks and the role of friction in manipulation.