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Object shape affects hand grip function for heavy objects in younger and older adults.

Jazmin Cruz1, Mario Garcia1, Cecilia Garza1

  • 1Human-Centric Design Research Lab, Department of Mechanical Engineering, Texas Tech University, Lubbock, TX, USA.

Ergonomics
|December 16, 2020
PubMed
Summary
This summary is machine-generated.

The shape of objects significantly impacts hand dexterity during heavy block tasks, more so than age, sex, or surface texture. Tool design should prioritize shape for improved user handling and grip function.

Keywords:
AgingBox and Block Test (BBT)griphand dexterity

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Area of Science:

  • Occupational therapy
  • Human factors engineering
  • Biomechanics

Background:

  • Hand-grip function is crucial for daily activities.
  • The Box and Block Test (BBT) assesses hand dexterity, typically with light objects.
  • Limited research exists on factors influencing dexterity with heavier objects.

Purpose of the Study:

  • To investigate the impact of block surface, shape, age, and sex on hand dexterity using heavy blocks in the BBT.
  • To determine which factors are most influential in heavy object manipulation.
  • To inform the design of tools for better user handling.

Main Methods:

  • Forty healthy participants (20-30 years and 50-60 years, males and females) performed the BBT.
  • Participants used steel blocks of different shapes (cylindrical, cubic) and surfaces (plain, black spray-painted, yellow non-slip).
  • Hand dexterity was measured by the number of blocks moved.

Main Results:

  • Object shape and repetition significantly affected BBT scores.
  • Surface texture, age, and sex did not show significant effects on dexterity with heavy blocks.
  • Shape emerged as the most critical factor influencing hand dexterity in this context.

Conclusions:

  • Object shape is a primary consideration for improving hand dexterity when handling heavy items.
  • Designers should prioritize shape over surface texture, age, and sex for tools requiring grip.
  • Findings have implications for industrial tool design and occupational therapy interventions.