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Related Experiment Videos

Stabilizing function of trunk flexor-extensor muscles around a neutral spine posture

J Cholewicki1, M M Panjabi, A Khachatryan

  • 1Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, Connecticut 06510, USA.

Spine
|November 5, 1997
PubMed
Summary

Trunk muscle coactivation around the neutral spine posture was experimentally observed in healthy individuals, increasing with added load. This muscle activity is crucial for maintaining lumbar spine mechanical stability.

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Spinal Health

Background:

  • Antagonistic trunk muscle coactivation is theoretically essential for lumbar spine stability.
  • Previous research lacked experimental evidence to support the role of coactivation in spinal stability.

Purpose of the Study:

  • To experimentally verify trunk flexor-extensor muscle coactivation in healthy individuals.
  • To determine if coactivation levels increase with external load.
  • To ascertain if coactivation contributes to lumbar spine mechanical stability.

Main Methods:

  • Surface electromyography (EMG) monitored six trunk muscles in ten participants during flexion-extension tasks.
  • Participants performed tasks with and without a 32-kg torso load.
  • Calculations using a biomechanical model assessed spine stability and predicted coactivation levels.

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Main Results:

  • EMG detected coactivation around the neutral spine posture (1.7% MVC without load, 2.9% MVC with 32kg load).
  • A stability-based biomechanical model predicted coactivation levels (1.0% MVC zero load, 3.1% MVC with 32kg load) closely matching experimental data.
  • The model indicated higher coactivation (3.4% MVC zero load, 5.5% MVC with 32kg) when passive spine stiffness was zero, simulating injury.

Conclusions:

  • Experimental evidence confirms trunk muscle coactivation around the neutral spine in healthy individuals.
  • This coactivation increases with added torso mass, highlighting its load-bearing role.
  • Biomechanical analysis attributes trunk muscle coactivation primarily to the neuromuscular system's need to ensure lumbar spine stability.