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Muscle response while holding an unstable load.

Yung-Hui Lee1, Tzu-Hsien Lee

  • 1Department of Industrial Management, National Taiwan University of Technology and Science, No. 43 Kee-Lung Road, Sec 4, Taipei 106, Taiwan. yhlee@im.ntust.edu.tw

Clinical Biomechanics (Bristol, Avon)
|May 30, 2002
PubMed
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Handling unstable loads with sudden shifts or impacts poses a greater risk to the musculoskeletal system than stable loads. Biomechanical measurements reveal specific muscle responses to these perturbations.

Area of Science:

  • Biomechanics
  • Human Movement Science
  • Occupational Health

Background:

  • Previous research on load handling primarily focused on stable loads.
  • Limited investigation exists on muscle responses and postural control with unstable loads.

Purpose of the Study:

  • To explore the physical risks associated with handling unstable loads using basic biomechanical measurements.
  • To investigate muscle responses during balance recovery from perturbations when handling unstable loads.

Main Methods:

  • Twelve male subjects handled time-variant loads (18 kg) with impact momentum (12 kgm/s).
  • Load-shift conditions included stable, posterior-to-anterior rolling, and anterior-to-posterior rolling.
  • Electromyography of brachioradialis, biceps, erector spinae, and hamstrings was measured across different stances.

Related Experiment Videos

Main Results:

  • Maximal brachioradialis and biceps exertions occurred ~0.1s after posterior-to-anterior impact.
  • Maximal erector spinae and hamstrings contractions were observed ~0.2s after impact.
  • Muscle responses were localized near the load-shift perturbation, influenced by biomechanical limitations.

Conclusions:

  • The central nervous system adapts muscle stabilization strategies based on perturbation location and biomechanical constraints.
  • Handling shifting, impact, or sudden-unexpected loads may be more detrimental to the musculoskeletal system than stable loads.