Effects of Frequency Adjustment in Functional Electrical Stimulation on Genioglossus Muscle Activity
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Functional Electrical Stimulation Device.
- Who it may be relevant to
- Registry conditions: Obstructive Sleep Apnea (OSA), Snoring. Basic parameters: from 19 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- South Korea
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Overview
This single-group interventional study investigates the safety and physiologic effects of functional electrical stimulation (FES) applied to the tongue and submental muscles in adults at high risk for sleep apnea. Participants will receive five stimulation frequencies (15, 25, 35, 45, and 75 Hz) in randomized order during a single visit. Ultrasound and tongue pressure (IOPI) measurements, as well as subjective assessments of discomfort and perceived effects, will be conducted before, during, and after stimulation. The primary objective is to evaluate changes in muscle thickness, length, and tongue strength across different stimulation frequencies. Secondary objectives include assessing participant discomfort, safety, and subjective treatment effects.
Detailed description
Reduced tone and weakness of the genioglossus muscle are critical factors in the pathophysiology of obstructive sleep apnea (OSA). In addition to the genioglossus, other upper airway-related muscles, including the thyrohyoid and additional infrahyoid muscles, contribute to airway stability. These muscles differ in anatomical depth from the skin surface and in muscle thickness, which necessitates differentiated electrical stimulation approaches to ensure selective activation and safety.This clinical trial is designed to evaluate the safety and efficacy of functional electrical stimulation (FES) applied to the genioglossus muscle with modulation of stimulation frequency. The study aims to determine whether frequency adjustment influences muscle morphology and functional outcomes.The primary objective is to assess frequency-dependent changes in muscle length and thickness using ultrasonography, as well as differences in tongue strength measured by the Iowa Oral Performance Instrument (IOPI) before and after electrical stimulation.The secondary objective is to evaluate discomfort, safety, and subjective treatment effects through questionnaires administered before and after the electrical stimulation intervention.
Interventions
- Device Functional Electrical Stimulation Device
A functional electrical stimulation device is applied to the submental region using surface adhesive electrodes. Stimulation is delivered at five different frequencies (15, 25, 35, 45, and 75 Hz) in randomized sequence during a single study visit. Each frequency is administered within the same session to evaluate immediate physiologic responses of the tongue muscles. Participants are blinded to the stimulation frequency applied during each condition.
Primary outcome measures
- Change in genioglossus muscle thickness measured by ultrasonography [Time frame: Before and immediately after stimulation at each frequency during a single study visit (~1 hour)]
- Change in genioglossus muscle length measured by ultrasonography [Time frame: Before and immediately after stimulation at each frequency during a single study visit (~1 hour)]
- Change in tongue strength measured by the Iowa Oral Performance Instrument (IOPI) [Time frame: Before stimulation and immediately after completion of all frequency conditions during a single study visit (~1 hour)]
Secondary outcome measures (1)
- Participant-reported discomfort associated with electrical stimulation [Time frame: During each stimulation frequency and immediately after completion of all frequency conditions during a single study visit (~1 hour)]
Eligibility criteria
Inclusion criteria
- Adults aged 19 years or older
- STOP questionnaire score ≥ 2
- Able to read and write in Korean
- Voluntarily provides written informed consent to participate in the study
Exclusion criteria
- Refusal to undergo study procedures or failure to provide informed consent
- Cognitive impairment or psychiatric disorders that interfere with the ability to follow study instructions
- Pregnant or breastfeeding women
- Known allergy or hypersensitivity to electrical stimulation pads or related materials (e.g., silicone, polypropylene, polyethylene)
- Skin conditions preventing application of electrical stimulation (e.g., hypersensitive skin)
- Medical conditions considered unsuitable for participation by the investigator (e.g., epilepsy, malignant tumor, high fever, diabetes mellitus, use of anticoagulants, phlebitis, thrombophlebitis, hemophilia)
- Infectious disease or local conditions at the stimulation site (e.g., inflammation, wounds, abscess, edema)
- Known cardiac disease or presence of a cardiac pacemaker or implanted electrical stimulation device
- History of surgery involving the submental area or upper airway region
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Allocation
- N/A
- Model
- Single group
- Masking
- Open label
- Primary purpose
- Basic science
Study locations
South Korea · 1 center
- Seoul National University Bundang Hospital — Gyeonggi-do
Identifiers
NCT: NCT07466888 · B-2506-978-001