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Related Experiment Videos

Triangularis sterni muscle use in supine humans.

A De Troyer, V Ninane, J J Gilmartin

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |March 1, 1987
    PubMed
    Summary

    The triangularis sterni muscle is a primary expiratory muscle in humans, activated during active breathing and non-respiratory actions. Its neural control is linked to abdominal muscles, aiding rib cage deflation.

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    Area of Science:

    • Physiology
    • Respiratory Mechanics
    • Human Electromyography

    Background:

    • The triangularis sterni (transversus thoracis) muscle's role in human respiration is not fully understood.
    • Previous research suggests it may function differently in humans compared to other mammals.

    Purpose of the Study:

    • To investigate the electrical activity of the human triangularis sterni muscle during various respiratory and non-respiratory maneuvers.
    • To compare the activation patterns of the triangularis sterni with abdominal muscles.

    Main Methods:

    • Electromyography (EMG) of the triangularis sterni muscle was recorded in 12 healthy subjects.
    • EMG data was collected during resting breathing, forced expiration, isovolume maneuvers, and non-respiratory actions.
    • Recordings were compared with those of abdominal muscles (external oblique, rectus abdominis).

    Main Results:

    • The triangularis sterni was typically inactive during resting breathing in supine humans.
    • Significant activation was observed during active expiration, expulsive maneuvers, and non-respiratory events like speech and coughing.
    • In trained subjects, triangularis sterni activation during expiration led to rib cage deflation and abdominal volume increase, even without abdominal muscle recruitment.

    Conclusions:

    • Spontaneous quiet expiration in supine humans is primarily a passive process.
    • The human triangularis sterni is a key muscle for active expiration, with neural activation often coupled to abdominal muscles.
    • This muscle likely plays a crucial role in deflating the rib cage during forceful expiratory efforts.

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