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Updated: Feb 18, 2026

Biomechanical Changes Related to Low Back Pain: An Innovative Tool for Movement Pattern Assessment and Treatment Evaluation in Rehabilitation
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THE RELATIONSHIP BETWEEN SEGMENTAL ROLLING ABILITY AND LUMBAR MULTIFIDUS ACTIVATION TIME.

Nicole Clark1, Michael L Voight, Ashley M Campbell

  • 1Belmont University, School of Physical Therapy, Nashville, TN USA.

International Journal of Sports Physical Therapy
|November 22, 2017
PubMed
Summary

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This study found that the lumbar multifidus muscle activates before the prime mover in individuals who can segmentally roll. Those unable to roll show a delay in lumbar multifidus activation, suggesting faulty muscle sequencing impacts spinal stability.

Area of Science:

  • Kinesiology
  • Biomechanical Analysis
  • Motor Control

Background:

  • Segmental rolling is used to assess and treat upper quarter, core, and lower quarter dysfunctions.
  • A lack of segmental spinal control/stabilization is theorized to cause dysfunctional rolling.
  • No current assessment tool evaluates motor coordination of local and global musculature for spinal stability.

Purpose of the Study:

  • To assess the temporal sequence of lumbar multifidus activation relative to anterior deltoid activation.
  • To determine if faulty muscle firing sequencing is associated with the inability to segmentally roll in subjects without mobility restrictions.
  • To investigate if corrective exercise can address faulty firing patterns in a pilot study.

Main Methods:

  • Electromyography (EMG) recorded multifidus and anterior deltoid activation in 20 healthy subjects.
Keywords:
Movement systemmultifidus muscleneuromuscular sequencingsegmental rolling

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  • Subjects were divided into 'can roll' (n=9) and 'can't roll' (n=11) cohorts based on segmental rolling ability.
  • Muscle onset latency was calculated as the time difference between multifidus and anterior deltoid contraction.

    • Main Results:

    • Lumbar multifidus activated 16.67ms before the anterior deltoid in the 'can roll' group.
    • Lumbar multifidus activation occurred 57.36ms after the anterior deltoid in the 'can't roll' group.
    • A statistically significant difference (p<0.00) in muscle firing time was observed between the two cohorts.

    Conclusions:

    • In individuals who can segmentally roll, lumbar multifidus activation precedes prime mover activation.
    • A delay in lumbar multifidus activation relative to the prime mover is confirmed in individuals unable to segmentally roll.
    • Faulty sequencing of lumbar multifidus firing may be linked to the inability to perform segmental rolling.