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Functional stability limits while holding loads in various positions.

M A Holbein1, M S Redfern

  • 1University of Pittsburgh, Department of Industrial Engineering, PA 15261, USA.

International Journal of Industrial Ergonomics
|May 1, 1997
PubMed
Summary
This summary is machine-generated.

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Body stability during manual material handling is crucial for injury prevention. This study found functional stability limits are about 60% of the base of support, influenced by load position.

Area of Science:

  • Biomechanics
  • Ergonomics
  • Occupational Safety

Background:

  • Maintaining postural stability is vital for preventing injuries during manual material handling.
  • Understanding the functional limits of stability is key to assessing risks associated with lifting and carrying loads.

Purpose of the Study:

  • To determine the functional stability limits relative to the base of support during load holding.
  • To investigate how load position affects postural stability.

Main Methods:

  • Fifteen male subjects performed maximal leaning tasks in sagittal and frontal planes.
  • Center of gravity (CoG) location was measured at stability limits.
  • Stability limits were assessed in relation to the base of support (BoS).

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Main Results:

  • Functional stability limits were reached at approximately 60% of the maximum base of support.
  • Average sway angles at stability limits were 9.2° (anteroposterior) and 15.3° (lateral).
  • Lowering the body-and-load system's center of gravity extended stability limits.

Conclusions:

  • Functional stability limits are a significant fraction of the base of support.
  • Load positioning critically influences postural stability during manual handling.
  • Findings can inform the development of safer lifting and reach guidelines.