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Related Experiment Videos

Interaction between voluntary and postural motor commands during perturbed lifting.

L I Oddsson1, T Persson, A G Cresswell

  • 1Neuromuscular Research Center, Boston University, Massachusetts, USA.

Spine
|April 2, 1999
PubMed
Summary

Sudden backward slips during lifting cause erratic back muscle activity, potentially increasing injury risk due to conflicting motor commands. This study investigated these electromyographic responses during perturbed lifting tasks.

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Area of Science:

  • Biomechanics
  • Motor Control
  • Occupational Safety

Background:

  • Previous research on postural perturbations focused on static standing.
  • Limited studies exist on perturbations during dynamic voluntary movements like lifting.

Purpose of the Study:

  • Investigate electromyographic (EMG) responses in the erector spinae during a lifting task with unexpected postural perturbations.
  • Hypothesize that conflicting motor commands during voluntary lifting and postural adjustments increase injury risk.

Main Methods:

  • Experimental study involving subjects lifting a 20-kg load on a movable platform.
  • Recorded muscle activity (EMG) of trunk and hip flexors/extensors.
  • Measured trunk flexion angle using video analysis during random perturbations.

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Main Results:

  • Forward perturbations increased erector spinae activity, indicating dual activation from voluntary and postural programs.
  • Backward perturbations caused a cessation of erector spinae activity, followed by fluctuations during trunk flexion (eccentric contraction).

Conclusions:

  • Erratic EMG activity in erector spinae after backward slips suggests rapid switching between conflicting motor programs.
  • This conflict may lead to rapid force changes in spinal tissues, elevating the risk of slip-and-fall back injuries.