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An optimal effective working height for hammering tasks.

Yuan-Ho Chen1, Yi-Lang Chen2,3

  • 1Department of Business Administration, Lunghwa University of Science and Technology, Taiwan.

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Summary
This summary is machine-generated.

Determining optimal hammering working height is crucial for job design. The ideal range, balancing trunk flexion and shoulder abduction, is 25-35 cm below elbow height, averaging 30 cm.

Keywords:
Hand toolhammering forcehammering postureworking height

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Area of Science:

  • Ergonomics and Occupational Health
  • Biomechanics of Manual Tasks
  • Workplace Design and Safety

Background:

  • Hammering tasks involve specific wrist motion paths, an area often overlooked in prior research.
  • Understanding the biomechanics of hammering is essential for preventing musculoskeletal disorders.

Purpose of the Study:

  • To identify the optimal working height for performing hammering tasks with a straight-handled hammer.
  • To analyze the effects of different working heights and hammering forces on worker posture.

Main Methods:

  • Ten participants executed hammering tasks at three working heights (64, 80, 96 cm) and three force levels (light, medium, heavy).
  • Kinematic data on shoulder abduction, trunk flexion, and lateral bending were recorded.

Main Results:

  • Increased working height linearly correlated with greater shoulder abduction but reduced trunk flexion.
  • Trunk flexion and lateral bending were influenced by hammering force, while upper extremity postures remained consistent.
  • Ulnar deviation and trunk lateral bending showed no significant sensitivity to working height variations.

Conclusions:

  • An effective working height range of 25-35 cm below elbow height (mean 30 cm) was established, balancing trunk flexion and shoulder abduction.
  • This identified range offers valuable insights for designing safer and more efficient hammering workstations.
  • Optimizing working height in hammering tasks can mitigate ergonomic risks and improve worker well-being.