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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

Summary

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.

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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.
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.

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