Hope for Kids with Pompe Disease

A New Study Tests Reflexology and Ear Nerve Stimulation for Tinnitus Relief

A new clinical trial in Taiwan is examining whether stimulating nerves in the foot and ear can quiet the persistent sound of tinnitus. The trial, officially titled “Efficacy of Foot Reflexology and Transcutaneous Auricular Vagus Nerve Stimulation on Tinnitus,” compares these non-drug approaches against standard care. With tinnitus affecting an estimated 12-30% of adults and drug treatments offering limited help, researchers are focusing on the body’s nervous system as a target for relief.

How the Trial is Designed

Conducted at Hualien Tzu Chi Hospital, this is a three-arm, randomized controlled trial. Investigators will enroll 180 participants and assign them to one of three groups: a foot reflexology (FR) group, a transcutaneous auricular vagus nerve stimulation (ta-VNS) group, or a usual-care control group. To rigorously test the specific effects of the therapies, the FR and ta-VNS groups are each split into true intervention and sham subgroups.

The sham procedures are designed to mimic the real treatment without delivering the hypothesized therapeutic action. For foot reflexology, the sham involves light, non-specific touch instead of targeted pressure. For the ta-VNS, the sham device stimulates the left earlobe at a very low current (0.5 mA), an area not linked to vagus nerve branches.

What Participants Will Experience

Participants in the active intervention groups will undergo four weekly 20-minute sessions. The foot reflexology protocol has three phases: relaxation, an inner-ear/autonomic regulation phase applying pressure to specific foot zones, and a circulation phase. The real ta-VNS intervention uses a device to deliver mild electrical pulses to three specific points on the left outer ear: the tragus, cymba conchae, and cavum conchae. The intensity is adjusted to a tingling sensation.

All participants, including those in the control group, will also perform daily self-administered auricular acupressure using magnetic beads on the ear. Researchers will collect data four times: at baseline, week 2, week 4, and at a final follow-up at week 8. The main measures are tinnitus severity, psychological distress, sleep quality, and two indicators of autonomic nervous system function: heart rate variability and levels of the stress hormone cortisol in saliva.

The Science Behind the Stimulation

This trial is built on a growing understanding of tinnitus as more than just an ear problem. Chronic tinnitus is frequently linked to hyperactivity in the central auditory system and, importantly, to dysregulation of the autonomic nervous system—the network that controls stress responses, heart rate, and arousal. This dysregulation often manifests as increased anxiety, poor sleep, and a persistent state of physiological stress.

Both foot reflexology and ta-VNS are thought to influence this system. Ta-VNS sends signals directly to the vagus nerve, a major conduit for parasympathetic (“rest-and-digest”) activity, which can counter stress arousal. Foot reflexology, through targeted pressure, may also promote autonomic regulation and relaxation. By measuring salivary cortisol and heart rate variability, the study aims to see if clinical symptom improvement correlates with these biological changes.

Who Can Join the Study

The trial seeks adults aged 18-75 for whom tinnitus is the primary and sole complaint. A key inclusion criterion is having relatively normal hearing, with pure-tone thresholds at or below 25 dB HL at several test frequencies. This helps ensure the tinnitus is not directly tied to significant peripheral hearing loss.

The exclusion criteria are specific to ensure safety. Individuals cannot join if they have objective tinnitus (sound audible to others), certain ear or cardiovascular diseases, open wounds on the foot or ear, diabetes with poorly controlled blood sugar (HbA1c >7.5%), or an implanted electronic device like a pacemaker. People who have had foot reflexology or vagus nerve stimulation in the past three months are also excluded.

Status and Potential Impact

The trial status is listed as RECRUITING, with a target enrollment of 180 participants. Data analysis will use generalized estimating equation (GEE) models to track changes over the four assessment points.

For the field of hearing health, this study could strengthen the evidence base for neuromodulation and somatosensory approaches to tinnitus. If successful, the results would point to specific, non-invasive protocols that clinicians could implement. For patients, it represents a potential path to managing tinnitus that avoids pharmaceuticals and their associated side effects, focusing instead on calming the body’s stress response system. The findings may help clarify which patients are most likely to benefit from these particular interventions.

This article is for informational purposes only. Consult a qualified professional for personalised advice.

Source:
FR-taVNS Tinnitus Tria (ClinicalTrials.gov: NCT07711639)