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Related Experiment Videos

Changes in masseter muscle activity associated with swallowing.

K Hiraoka1

  • 1Department of Physical Therapy, Osaka Prefecture College of Nursing, Osaka, Japan. hiraoka@osaka.hsu.ac.jp

Journal of Oral Rehabilitation
|September 25, 2004
PubMed
Summary

Swallowing involves complex muscle coordination, with masseter muscle activity showing a biphasic modulation—an initial increase followed by a decrease—in healthy humans during voluntary saliva ingestion.

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Area of Science:

  • Physiology
  • Biomechanics
  • Neurology

Background:

  • The masseter muscle, a primary masticatory muscle, plays a role in jaw closure.
  • Understanding its activity during deglutition (swallowing) is crucial for diagnosing and treating oropharyngeal dysphagia.

Purpose of the Study:

  • To investigate the electromyographic (EMG) activity patterns of the masseter muscle during voluntary saliva swallowing in healthy human subjects.
  • To determine the temporal relationship between masseter muscle activity and suprahyoid muscle complex activity during the swallowing process.

Main Methods:

  • Electromyography (EMG) was utilized to record electrical activity from the masseter muscle and the suprahyoid muscle complex.
  • Seven healthy human subjects performed voluntary saliva swallowing under controlled conditions, including the maintenance of low-intensity tonic clenching to observe both increases and decreases in masseter activity.

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Main Results:

  • A significant increase in masseter EMG amplitude above baseline was observed in 6 out of 7 subjects during the initial phase of swallowing, preceding suprahyoid muscle activation.
  • A significant decrease in masseter EMG amplitude below baseline was observed in 6 out of 7 subjects during the later phase of swallowing, following suprahyoid muscle activation.

Conclusions:

  • Human swallowing elicits a biphasic modulation of masseter motoneuron excitability, characterized by an initial increase and subsequent decrease in muscle activity.
  • These findings suggest a complex neural control mechanism for the masseter muscle during swallowing, warranting further investigation into its applicability under natural feeding conditions.