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How forearm position affects grip strength

L G Richards1, B Olson, P Palmiter-Thomas

  • 1Occupational Therapy Education Department, University of Kansas Medical Center, Kansas City 66160-7602, USA.

The American Journal of Occupational Therapy : Official Publication of the American Occupational Therapy Association
|February 1, 1996
PubMed
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Forearm position significantly impacts grip strength. Supination yielded the strongest grip, while pronation resulted in the weakest grip strength, highlighting the need for standardized testing positions.

Area of Science:

  • Biomechanics
  • Human factors engineering
  • Ergonomics

Background:

  • Previous research indicates body position affects grip strength.
  • The specific influence of forearm positioning on grip strength remains under-investigated.

Purpose of the Study:

  • To examine the effect of forearm position (supinated, neutral, pronated) on grip strength.
  • To determine if forearm positioning influences grip strength measurements.
  • To provide data for optimizing grip strength testing protocols.

Main Methods:

  • 106 subjects performed grip strength tests.
  • Forearm positions included supinated, neutral, and pronated.
  • Grip strength was measured using the standard American Society of Hand Therapists position.

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Main Results:

  • Grip strength was highest in the supinated forearm position.
  • Grip strength was moderate in the neutral forearm position.
  • Grip strength was lowest in the pronated forearm position.

Conclusions:

  • Forearm position demonstrably alters grip strength.
  • Standardized forearm positioning is crucial for consistent grip strength assessment.
  • Understanding these biomechanical effects can inform the design of tools and environments to enhance user capabilities.