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In Vivo Evaluation of the Mechanical and Viscoelastic Properties of the Rat Tongue
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Interferential electric stimulation applied to the neck increases swallowing frequency.

Takayuki Furuta1, Masanori Takemura, Junzo Tsujita

  • 1Department of Physiology, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan.

Dysphagia
|May 25, 2011
PubMed
Summary

Interferential currents (IFCs) at 50-Hz modulation significantly increased swallowing frequency in healthy subjects. This novel kilohertz-frequency alternating current (AC) stimulation may offer a comfortable alternative for treating pharyngeal dysphagia.

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Area of Science:

  • Neurology
  • Biomedical Engineering
  • Gerontology

Background:

  • Swallowing disorders (dysphagia) are prevalent in the elderly population.
  • Surface electrical stimulation, particularly pulsed currents (1-120 Hz), is explored for treating pharyngeal dysphagia.
  • Kilohertz-frequency alternating currents (ACs) have not been investigated for dysphagia treatment.

Purpose of the Study:

  • To evaluate the effects of interferential currents (IFCs) on the swallowing reflex in healthy individuals.
  • To compare the efficacy of IFCs with pure AC stimulation at kilohertz frequencies.
  • To determine the optimal stimulation parameters for potential dysphagia treatment.

Main Methods:

  • Healthy subjects received surface electrical stimulation on the neck region.
  • Interferential currents (IFCs) with varying carrier frequencies (1-6 kHz) and 50-Hz modulation were applied.
  • Swallowing reflex responses were measured, comparing IFCs to pure AC stimulation at sensory threshold.
  • Stimulation duration was 15 minutes.

Main Results:

  • IFC stimulation at 50-Hz modulation significantly increased the number of swallows without causing discomfort.
  • Pure AC stimulation at the carrier frequency did not yield significant effects on swallowing frequency.
  • No significant differences in swallow frequency were observed across tested carrier frequencies (1,000–6,000 Hz).
  • The facilitatory effect on swallowing persisted throughout the 15-minute IFC stimulation period, indicating no rapid adaptation.

Conclusions:

  • Interferential currents (IFCs) with low-frequency modulation (e.g., 50 Hz) can effectively facilitate the swallowing reflex in healthy individuals.
  • IFCs represent a promising, potentially more comfortable alternative to pulsed currents for treating pharyngeal dysphagia.
  • Further research into modulated kilohertz AC stimulation is warranted for clinical application in dysphagia management.