الفهرس 
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Abstract
Rotary chair testing is a mid-frequency test to assess horizontal semicircular canal function. It produces a more natural, precise, repeatable, and broadband evaluation of the vestibular function. Standard rotational testing involves Sinusoidal Harmonic Acceleration test (SHAT) and Velocity-step test (VST).
The current study aimed to develop normative data for the SHAT and VST, as well as to study reliability of the response parameters characterizing those two tests.
SHAT and VST were performed on 100 subjects, divided into two groups according to age (group A: below 50 years and group B: 50 years or above). In addition, 30 subjects were tested twice to evaluate the test-retest reliability.
The study results demonstrated normative data for SHAT gain, phase, symmetry and VST time constant. Additionally, there were no significant age related differences in VOR gain, phase and symmetry; however post rotatory time constant was significantly longer for the older group. Reliability results showed moderate to high reliability for both tests (except for the highest frequencies in SHAT).
These results suggest the presence of interlaboratory variations which raises the importance of having normative data for each laboratory. Moreover, vestibular degeneration has no impact on rotatory chair tests and that the rotatory chair is a reliable tool to evaluate horizontal canal functi