The effect of wrist position, angular velocity, and exertion direction on simultaneous maximal grip force and wrist torque under the isokinetic conditions

Myung Chul Jung, Susan Hallbeck

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The objective of the study was to identify the effects of wrist position, force exertion direction, and angular velocity on simultaneous grip force and wrist torque under the isokinetic condition. Twenty-five male students participated in the study and the isokinetic wrist dynamometer was utilized to measure both forces from 90° of flexion to 90° of extension in the slow velocities of 10°/s, 20°/s, and 30°/s. The results revealed that grip force and wrist torque were larger around neutral and there was a passive force in the extremely extended wrist position. Wrist torque only was higher in the flexion direction but grip force for both directions did not differ significantly. Both grip force and wrist torque decreased when angular velocities increased and velocities could be classified into three groups, such as isometric, 5-20°/s, over 25°/s, according to the magnitude of force reduction. Finally, it was described that wrist positions, where maximal grip force and wrist torque occurred, were inconsistent and significant ranges of the wrist position including maximal forces were broad under the isokinetic condition of even slow velocities.

Original languageEnglish (US)
Pages (from-to)133-143
Number of pages11
JournalInternational Journal of Industrial Ergonomics
Volume29
Issue number3
DOIs
StatePublished - 2002
Externally publishedYes

Fingerprint

Torque
Hand Strength
Angular velocity
Wrist
Group
student
Dynamometers
Direction compound
Students

Keywords

  • Angular velocity
  • Force exertion direction
  • Grip force
  • Isokinetic condition
  • Wrist position
  • Wrist torque

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Safety, Risk, Reliability and Quality
  • Human Factors and Ergonomics

Cite this

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abstract = "The objective of the study was to identify the effects of wrist position, force exertion direction, and angular velocity on simultaneous grip force and wrist torque under the isokinetic condition. Twenty-five male students participated in the study and the isokinetic wrist dynamometer was utilized to measure both forces from 90° of flexion to 90° of extension in the slow velocities of 10°/s, 20°/s, and 30°/s. The results revealed that grip force and wrist torque were larger around neutral and there was a passive force in the extremely extended wrist position. Wrist torque only was higher in the flexion direction but grip force for both directions did not differ significantly. Both grip force and wrist torque decreased when angular velocities increased and velocities could be classified into three groups, such as isometric, 5-20°/s, over 25°/s, according to the magnitude of force reduction. Finally, it was described that wrist positions, where maximal grip force and wrist torque occurred, were inconsistent and significant ranges of the wrist position including maximal forces were broad under the isokinetic condition of even slow velocities.",
keywords = "Angular velocity, Force exertion direction, Grip force, Isokinetic condition, Wrist position, Wrist torque",
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AU - Jung, Myung Chul

AU - Hallbeck, Susan

PY - 2002

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N2 - The objective of the study was to identify the effects of wrist position, force exertion direction, and angular velocity on simultaneous grip force and wrist torque under the isokinetic condition. Twenty-five male students participated in the study and the isokinetic wrist dynamometer was utilized to measure both forces from 90° of flexion to 90° of extension in the slow velocities of 10°/s, 20°/s, and 30°/s. The results revealed that grip force and wrist torque were larger around neutral and there was a passive force in the extremely extended wrist position. Wrist torque only was higher in the flexion direction but grip force for both directions did not differ significantly. Both grip force and wrist torque decreased when angular velocities increased and velocities could be classified into three groups, such as isometric, 5-20°/s, over 25°/s, according to the magnitude of force reduction. Finally, it was described that wrist positions, where maximal grip force and wrist torque occurred, were inconsistent and significant ranges of the wrist position including maximal forces were broad under the isokinetic condition of even slow velocities.

AB - The objective of the study was to identify the effects of wrist position, force exertion direction, and angular velocity on simultaneous grip force and wrist torque under the isokinetic condition. Twenty-five male students participated in the study and the isokinetic wrist dynamometer was utilized to measure both forces from 90° of flexion to 90° of extension in the slow velocities of 10°/s, 20°/s, and 30°/s. The results revealed that grip force and wrist torque were larger around neutral and there was a passive force in the extremely extended wrist position. Wrist torque only was higher in the flexion direction but grip force for both directions did not differ significantly. Both grip force and wrist torque decreased when angular velocities increased and velocities could be classified into three groups, such as isometric, 5-20°/s, over 25°/s, according to the magnitude of force reduction. Finally, it was described that wrist positions, where maximal grip force and wrist torque occurred, were inconsistent and significant ranges of the wrist position including maximal forces were broad under the isokinetic condition of even slow velocities.

KW - Angular velocity

KW - Force exertion direction

KW - Grip force

KW - Isokinetic condition

KW - Wrist position

KW - Wrist torque

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