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Related Experiment Videos

Chest wall and trunk muscle activity during inspiratory loading.

S J Cala1, J Edyvean, L A Engel

  • 1Thoracic Medicine Unit, Westmead Hospital, New South Wales, Australia.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 1, 1992
PubMed
Summary

Chest wall and trunk (CWT) muscles activate with increasing inspiratory pressure. Their EMG activity also increases with lung volume, suggesting a role in pressure generation and stabilization during breathing.

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Area of Science:

  • Respiratory Physiology
  • Biomechanics

Background:

  • The role of chest wall and trunk (CWT) muscles in respiration is not fully elucidated.
  • Understanding muscle recruitment patterns is crucial for respiratory mechanics.

Purpose of the Study:

  • To investigate electromyographic (EMG) activity in CWT muscles during inspiratory efforts.
  • To determine the influence of posture and lung volume on CWT muscle activation.

Main Methods:

  • Measured EMG activity in erector spinae, latissimus dorsi, pectoralis major, trapezius, and parasternal muscles.
  • Subjects performed graded inspiratory efforts against occlusion and inspiratory resistive loading in upright and seated postures.
  • EMG activity was correlated with inspiratory pressure and lung volume.

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Main Results:

  • CWT muscle EMG increased with inspiratory pressure (Pmus) across lung volumes and postures.
  • No significant difference in EMG recruitment between CWT and parasternal muscles.
  • EMG activity showed greater dependence on lung volume in the upright posture.

Conclusions:

  • CWT muscles contribute to generating inspiratory pressure.
  • These muscles may act as fixators, stabilizing the vertebral column during inspiration.
  • Their stabilizing function might be less effective at high lung volumes due to altered muscle insertion angles.