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Sternomastoid muscle function and fatigue in man

J Moxham, C M Wiles, D Newham

    Clinical Science (London, England : 1979)
    |December 1, 1980
    PubMed
    Summary
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    This study measured sternomastoid muscle contraction force and found low-frequency fatigue similar to other muscles. This fatigue, persisting for hours, could impact respiratory failure in pulmonary disease patients.

    Area of Science:

    • Physiology
    • Respiratory Medicine
    • Neuromuscular Function

    Background:

    • Accessory respiratory muscles, like the sternomastoid, play a role in breathing.
    • Understanding their fatigue properties is crucial for respiratory health.
    • Previous research has not fully characterized sternomastoid muscle fatigue in response to varying stimulation frequencies.

    Purpose of the Study:

    • To investigate the relationship between stimulation frequency and contraction force in the human sternomastoid muscle.
    • To assess the impact of fatigue, induced by inspiratory loading or maximal ventilation, on sternomastoid muscle function.
    • To explore the potential clinical implications of sternomastoid muscle low-frequency fatigue in patients with pulmonary disease.

    Main Methods:

    • Developed a technique to measure sternomastoid muscle contraction force at different stimulation frequencies.

    Related Experiment Videos

  • Induced fatigue through inspiratory loading and sustained maximal voluntary ventilation.
  • Compared force generation at low stimulation frequencies before and after fatigue induction.

    • Main Results:

    • The frequency-force relationship in the sternomastoid muscle closely resembled that of limb muscles (quadriceps, adductor pollicis).
    • Fatigue significantly reduced force generation, particularly at lower stimulation frequencies, compared to maximal force.
    • This low-frequency fatigue was observed to persist for several hours post-fatigue induction.

    Conclusions:

    • Sternomastoid muscle exhibits low-frequency fatigue characteristics similar to other skeletal muscles.
    • Persistent low-frequency fatigue in the sternomastoid could compromise respiratory function.
    • This finding has significant implications for understanding and managing respiratory failure in patients with pulmonary conditions.