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Measurement of Spatial Stability in Precision Grip
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Grip force and force sharing in two different manipulation tasks with bottles.

Javier Cepriá-Bernal1, Antonio Pérez-González1, Marta C Mora1

  • 1a Departamento de Ingeniería Mecánica y Construcción , Universitat Jaume I , Castellón , Spain.

Ergonomics
|September 13, 2016
PubMed
Summary

This study examined how bottle shape and fullness affect grip force and how tasks like transporting and pouring change how hands share grip forces. Results show task and bottle design significantly alter grip strategies.

Keywords:
Graspingforce sharinggrip force

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Area of Science:

  • Biomechanics
  • Human Factors Engineering
  • Occupational Therapy

Background:

  • Understanding how humans grip and manipulate objects is crucial for designing tools and assistive devices.
  • Previous research has explored grip force but often in simplified or non-daily tasks.
  • Investigating force sharing provides deeper insights into hand function during complex activities.

Purpose of the Study:

  • To analyze grip force and force sharing during two activities of daily living: transporting and pouring bottles.
  • To determine the influence of bottle features (shape, filling level) and task type on grip mechanics.
  • To quantify the contribution of different hand/finger segments to overall grip force during these tasks.

Main Methods:

  • 10 right-handed subjects performed transporting and pouring tasks with four bottle types at two filling levels.
  • Hand instrumentation with eight wearable force sensors to measure grip force and force distribution.
  • Analysis of grip force, load force, and force sharing ratios across different conditions.

Main Results:

  • Grip force and force sharing varied significantly with bottle model and filling level.
  • Increased filling level led to higher grip force, but grip-to-load force ratio was higher for lighter loads.
  • Task type influenced force sharing (e.g., thumb/ring finger in pouring, palm/index in transport), but not mean grip force.

Conclusions:

  • Bottle characteristics and filling levels significantly impact grip force and its distribution.
  • Task demands (transporting vs. pouring) modulate how the hand distributes grip forces among its components.
  • Findings offer insights for designing objects and rehabilitation strategies considering hand biomechanics in daily tasks.