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Wrist action affects precision grip force

M M Werremeyer1, K J Cole

  • 1Department of Exercise Science, The University of Iowa, Iowa City 52242, USA.

Journal of Neurophysiology
|July 1, 1997
PubMed
Summary
This summary is machine-generated.

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Voluntary wrist actions significantly increase grip force, independent of load force, by recruiting extrinsic hand muscles. This muscle coactivation enhances grasp stability during object manipulation and movement.

Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Motor Control

Background:

  • Precision grip involves coordinated fingertip forces (grip and load).
  • Extrinsic finger muscles cross the wrist, suggesting a link between wrist actions and grip control.

Purpose of the Study:

  • To investigate if voluntary wrist actions can modulate grip force independently of load force.
  • To understand the role of extrinsic finger muscles in grip force regulation during wrist movements.

Main Methods:

  • Subjects performed voluntary wrist movements (flexion, extension, horizontal plane) and isometric wrist actions.
  • Electromyography (EMG) of index finger muscles and fingertip forces (grip and load) were recorded.
  • Grip force responses to wrist motion, isometric actions, and even isometric knee extension were analyzed.

Related Experiment Videos

Main Results:

  • Grip force increased significantly with wrist angular speed and sustained extreme wrist positions.
  • Increased grip force occurred even with constant fingertip loads during isometric wrist actions.
  • Wrist actions elicited grip force pulses and elevated static grip force, which subjects could not suppress.
  • Muscle activity in extrinsic finger muscles correlated with wrist flexion and extension.

Conclusions:

  • Extrinsic hand muscles are recruited to assist wrist actions, increasing grip-load ratios.
  • This muscle coactivation enhances grasp stability by coordinating grip force with inertial loads during object transport.
  • The mechanism contributes to grasp stability, particularly during dynamic upper limb movements.