Effects of Frequency Adjustment in Functional Electrical Stimulation on Genioglossus Muscle Activity

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.

Study Overview

• Status: Recruiting
• Conditions: Snoring; Obstructive Sleep Apnea (OSA)
• Intervention / Treatment: Device: Functional Electrical Stimulation Device

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.

• Study Type: Interventional
• Enrollment (Estimated): 28
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Juseok Ryu, M.D., Ph.D.; Phone Number: +82-31-787-7739; Email: jseok337@snu.ac.kr
• Study Contact Backup: Name: Hyunjin KIM; Phone Number: +82-10-9974-7152

Study Locations

• South Korea
  • Seongnam-si
    • Gyeonggi-do, Seongnam-si, South Korea, 463-707
      • Recruiting
      • Seoul National University Bundang Hospital
      • Contact: Hyunjin KIM; Phone Number: +82-10-9974-7152; Email: RQ300@snubh.org

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: Yes

Description

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

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Multi-frequency Functional Electrical Stimulation; All participants receive a single-session multi-frequency functional electrical stimulation protocol (15-75 Hz) applied in randomized order. Ultrasound and tongue pressure (IOPI) measurements are performed before and after stimulation, while subjective assessments of discomfort and perceived effects are collected during each stimulation frequency. Participants are blinded to stimulation frequency.

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.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in genioglossus muscle thickness measured by ultrasonography	The thickness of the genioglossus muscle is measured using ultrasonography before and immediately after electrical stimulation at each frequency (15, 25, 35, 45, and 75 Hz) during a single study visit.	Before and immediately after stimulation at each frequency during a single study visit (~1 hour)
Change in genioglossus muscle length measured by ultrasonography	The length of the genioglossus muscle is measured using ultrasonography before and immediately after electrical stimulation at each frequency (15, 25, 35, 45, and 75 Hz) during a single study visit.	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)	Tongue strength is measured using the Iowa Oral Performance Instrument (IOPI) in kilopascals (kPa) before electrical stimulation and immediately after completion of all frequency conditions during a single study visit (~1 hour). IOPI scores range from 0 kPa (no measurable pressure) to approximately 70 kPa (maximum tongue strength), with higher scores indicating greater tongue strength.	Before stimulation and immediately after completion of all frequency conditions during a single study visit (~1 hour)

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Participant-reported discomfort associated with electrical stimulation	Participant discomfort is assessed using a 1-5 Likert scale questionnaire during each stimulation frequency and immediately after completion of all frequency conditions during the study visit (~1 hour). Scale interpretation: 1 = very uncomfortable, 2 = uncomfortable, 3 = neutral, 4 = comfortable, 5 = very comfortable. Higher scores indicate greater comfort.	During each stimulation frequency and immediately after completion of all frequency conditions during a single study visit (~1 hour)

Collaborators and Investigators

• Sponsor: Seoul National University Bundang Hospital
• Collaborators: National Research Foundation of Korea
• Investigators: Principal Investigator: Jee Hyun Suh, M.D., Ph.D., Seoul National University Bundang Hospital

Study record dates

Study Major Dates

• Study Start (Actual): January 6, 2026
• Primary Completion (Estimated): March 1, 2026
• Study Completion (Estimated): April 1, 2026

Study Registration Dates

• First Submitted: February 24, 2026
• First Submitted That Met QC Criteria: March 8, 2026
• First Posted (Actual): March 12, 2026

Study Record Updates

• Last Update Posted (Actual): March 12, 2026
• Last Update Submitted That Met QC Criteria: March 8, 2026
• Last Verified: March 1, 2026

More Information

Terms related to this study

• Keywords: Obstructive Sleep Apnea (OSA); Snoring; FES
• Additional Relevant MeSH Terms: Nervous System Diseases; Respiratory Tract Diseases; Respiration Disorders; Sleep Wake Disorders; Signs and Symptoms, Respiratory; Apnea; Sleep Disorders, Intrinsic; Dyssomnias; Sleep Apnea Syndromes; Respiratory Sounds; Pathological Conditions, Signs and Symptoms; Signs and Symptoms; Sleep Apnea, Obstructive; Snoring
• Other Study ID Numbers: B-2506-978-001

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No