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Related Concept Videos

Net Torque Calculations01:19

Net Torque Calculations

When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to rotate...
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Torque

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Moment of a Force: Problem Solving01:29

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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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Torque Free Motion01:15

Torque Free Motion

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Related Experiment Video

Updated: Jun 28, 2026

Measurement of Spatial Stability in Precision Grip
09:36

Measurement of Spatial Stability in Precision Grip

Published on: June 4, 2020

Dynamic torque during a precision grip task comparable to picking a raspberry.

Dieter F Kutz1, Alexander Wölfel, Dagmar Timmann

  • 1Department of Physiological Genomics, Institute of Physiology, University of Munich, Pettenkoferstr. 12, 80336 Munich, Germany. kutz@lmu.de

Journal of Neuroscience Methods
|November 4, 2008
PubMed
Summary
This summary is machine-generated.

Cerebellar patients struggle with grip-force control, generating excessive torque due to poor finger positioning. Rehabilitation should focus on breaking this cycle of increased grip force and instability.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Biomechanics

Background:

  • Torque control is crucial for effective grip-force regulation.
  • Previous research highlights the link between torque and grip force, but dynamics during increasing forces remain less understood.

Purpose of the Study:

  • To introduce and validate a novel task for quantifying torque development dynamics during grip force increase.
  • To analyze grip control differences between healthy individuals and cerebellar patients.

Main Methods:

  • Developed a raspberry-picking-like task to measure grip forces and finger positions.
  • Utilized a new technique to analyze grip forces and derive torques from geometric properties.
  • Compared task performance in two healthy subjects and two cerebellar patients.

Main Results:

  • Healthy subjects minimized torque while increasing grip force.
  • Cerebellar patients exhibited disproportionately increased torque with rising grip forces.
  • Patients' difficulty in optimizing finger positions on the grip rod was a primary cause of high torques and instability.

Conclusions:

  • Cerebellar patients' ataxia leads to compensatory over-gripping, creating a destabilizing torque feedback loop.
  • Effective rehabilitation must target this vicious cycle to improve grip control in patients.