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Functional differentiation within latissimus dorsi

M E Paton1, J M Brown

  • 1Department of Biomedical Science, University of Wollongong, Australia.

Electromyography and Clinical Neurophysiology
|August 1, 1995
PubMed
Summary
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The Central Nervous System (CNS) can selectively activate different parts of the Latissimus Dorsi muscle, demonstrating functional differentiation. This means the CNS controls muscle subunits independently for efficient movement.

Area of Science:

  • Kinesiology
  • Neuroscience
  • Human Physiology

Background:

  • Skeletal muscle exhibits functional differentiation, allowing the Central Nervous System (CNS) to independently control muscle subunits.
  • This control optimizes muscle efficiency by selectively activating appropriate muscle segments for specific tasks.

Purpose of the Study:

  • To investigate the presence of functional differentiation within the Latissimus Dorsi muscle.
  • To determine if the CNS can selectively activate different regions of the Latissimus Dorsi during isometric contractions.

Main Methods:

  • Surface electromyographic (EMG) potentials were recorded from six electrode pairs along the Latissimus Dorsi origin.
  • EMG signals were integrated (IEMG) and normalized (nIEMG) during various isometric contractions.

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  • Normalized EMG waveforms were statistically compared to assess regional muscle activation variations.

    • Main Results:

    • Functional differentiation was observed within the Latissimus Dorsi muscle.
    • Adduction from an abducted shoulder position preferentially activated the caudal fibers.
    • Adduction from the anatomical position and horizontal extension involved broader muscle activation.

    Conclusions:

    • The Latissimus Dorsi muscle demonstrates functional differentiation, with distinct fiber regions activated based on movement demands.
    • The CNS selectively recruits specific Latissimus Dorsi segments to ensure efficient muscle utilization during different contractions.