Dizziness and vertigo affect millions of people worldwide, yet the tests most commonly used to investigate vestibular disorders do not capture the full range of how the balance system operates. A new review published in ENT Discovery argues that rotational chair testing could help close this long-standing diagnostic gap by measuring vestibulo-ocular reflex function at frequencies that fall between the strengths of video head impulse testing and caloric stimulation.
The vestibular system relies on signals from the inner-ear semicircular canals to stabilize vision during head movement. Clinicians commonly assess this system with video head impulse testing, or vHIT, which evaluates the response to rapid, high-frequency head movements, and caloric testing, which stimulates the horizontal canals at ultra-low frequencies using warm or cool air or water. Both methods are clinically valuable, but neither fully represents the mid-frequency range used during many ordinary movements, such as walking, turning the head or riding in a vehicle.
Rotational chair testing is designed to examine this overlooked range. In a computer-controlled chair, a patient is rotated at carefully selected frequencies, typically from 0.01 to 0.64 hertz, while eye movements are recorded. These frequencies stimulate both horizontal semicircular canals simultaneously and allow clinicians to quantify the vestibulo-ocular reflex, the automatic response that keeps images stable on the retina when the head moves. Because the system delivers precisely controlled motion, it can produce highly reproducible measurements while avoiding the discomfort and nausea that some patients experience during caloric testing.
The review describes four principal measurements used to interpret rotational chair results: gain, phase, symmetry and time constant. Gain compares eye velocity with chair velocity and indicates how effectively the reflex compensates for head movement. Phase measures the timing relationship between the stimulus and the eye response, while symmetry compares the strength of responses between the two directions of rotation. The time constant reflects how long the response persists after stimulation and can provide information about the dynamics of the vestibular system. Together, these metrics may help distinguish damage originating in the inner ear from abnormalities involving central compensation in the brain.
The technology may be particularly useful for patients with bilateral vestibulopathy, a condition in which both sides of the vestibular system are impaired. Individuals with bilateral loss often experience blurred vision during walking, unsteadiness in darkness and difficulty maintaining balance on uneven ground. In some cases, caloric testing produces no measurable response, while rotational chair testing can detect residual low-frequency function. Identifying that remaining capacity could help clinicians estimate prognosis, select rehabilitation exercises and monitor whether therapy is producing measurable improvement.
The test may also add important information in presbyvestibulopathy, an age-related decline in vestibular function. Older adults frequently experience a combination of reduced inner-ear sensitivity, impaired vision, weaker proprioception and slower central compensation. Rotational chair testing can help quantify the vestibular component of that decline and may reveal deficits that are not obvious from bedside examination alone. In patients recovering from acute unilateral vestibular injury, repeated testing could show whether symptoms have improved because the damaged organ has recovered or because the brain has adapted to an ongoing imbalance.
That distinction is clinically significant. A patient may feel better even though vestibular function remains reduced, because the central nervous system has recalibrated visual, proprioceptive and vestibular signals. Conversely, persistent abnormalities in the low- or mid-frequency response may help explain why symptoms return when the patient is tired, moves quickly or encounters visually complex surroundings. By tracking gain, phase and symmetry over time, clinicians may be able to follow compensation more objectively rather than relying only on subjective reports of dizziness.
The review also highlights applications in groups that are difficult to evaluate with conventional methods. Children with hearing loss or congenital inner-ear malformations may have subtle vestibular deficits that remain undetected during routine assessment. Rotational chair testing can be performed without requiring the rapid, precisely timed head movements needed for vHIT, making it potentially useful for younger patients or individuals who cannot cooperate with standard procedures. It may also assist in evaluating cochlear implant recipients, patients with Ménière’s disease and people with vestibular migraine, where symptoms can be substantial even when conventional findings are inconsistent.
Another potential role lies in conditions that are not primarily caused by the inner ear. Cerebrovascular disease, persistent postural-perceptual dizziness and other disorders involving sensory integration or central processing can alter the way vestibular information is used. Rotational chair findings cannot identify every cause of dizziness, but they may provide physiological evidence of abnormal balance-system performance when imaging and routine examinations are inconclusive. The authors suggest that this could support more individualized vestibular rehabilitation, including exercises tailored to a patient’s specific frequency-dependent deficits.
Despite these advantages, rotational chair testing is not a standalone diagnostic solution. The review notes that the procedure cannot reliably lateralize a unilateral lesion by itself, because both horizontal canals are stimulated together. Equipment costs are also higher than those of some conventional bedside assessments, and widely accepted age-stratified normative databases remain limited. Results must therefore be interpreted alongside the patient’s history, neurological examination, hearing assessment, vHIT, caloric testing and, when appropriate, imaging. The authors call for multicenter studies to establish standardized reference ranges and consistent testing protocols. They also envision artificial-intelligence tools that could assist with interpretation and cloud-based systems that might bring sophisticated vestibular analysis into primary care. If these developments succeed, rotational chair testing could evolve from a specialized laboratory procedure into part of an integrated digital pathway for diagnosing dizziness, monitoring recovery and guiding personalized treatment.
Subject of Research: Vestibular disorders and the clinical application of rotational chair testing.
Article Title: Advances in the Clinical Application of Rotational Chair Testing for the Diagnosis and Management of Vestibular Disorders
News Publication Date: 24-Jun-2026
Web References: https://doi.org/10.15302/ENTD.2026.060002
References: ENT Discovery, DOI: 10.15302/ENTD.2026.060002
Keywords: rotational chair testing, vestibular disorders, dizziness, vertigo, vestibulo-ocular reflex, bilateral vestibulopathy, presbyvestibulopathy, vestibular rehabilitation, vHIT, caloric testing, Ménière’s disease, vestibular migraine
