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Related Experiment Videos

Flexion-relaxation response to cyclic lumbar flexion.

Michael W Olson1, Li Li, Moshe Solomonow

  • 1Occupational Medicine Research Center, New Orleans, LA 70112, USA. msolom@lsuhsc.edu

Clinical Biomechanics (Bristol, Avon)
|September 3, 2004
PubMed
Summary

Sustained cyclic lumbar flexion increases myoelectric silence, reducing lumbar stability and potentially causing micro-damage to tissues. This suggests a neuromuscular disorder risk from prolonged, unloaded flexion exercises.

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Area of Science:

  • Biomechanics
  • Neuromuscular Physiology
  • Spinal Health

Background:

  • Epidemiological studies identify cyclic lumbar flexion as a risk factor for cumulative low back disorder.
  • Lack of experimental biomechanical data in humans to confirm these epidemiological findings.
  • Need to investigate the human response to sustained cyclic lumbar flexion.

Purpose of the Study:

  • To investigate the flexion-relaxation response to sustained cyclic lumbar flexion in humans.
  • To provide experimental biomechanical data confirming epidemiological observations.
  • To assess the impact of cyclic lumbar flexion on lumbar stability and tissue integrity.

Main Methods:

  • Twelve healthy college-aged males participated in the study.
  • Participants performed deep cyclic lumbar flexion at 0.1 Hz for 9 minutes.

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  • Lumbar paraspinal electromyogram (EMG) and kinematic data were recorded.

    • Main Results:

    • Significant increase in the angular excursion of myoelectric silence during deep flexion.
    • Earlier EMG cessation during flexion and delayed extensor activation during extension observed.
    • EMG magnitude increased by ~30% during flexion and ~10% during extension; spasms indicated micro-damage.

    Conclusions:

    • Enhanced flexion-relaxation phenomenon during prolonged cyclic flexion reduces lumbar stability, potentially harming low back health.
    • Sustained cyclic lumbar flexion causes micro-damage to viscoelastic tissues, evidenced by spasms.
    • A neuromuscular disorder can be evoked by relatively short periods of unloaded cyclic lumbar flexion.