Post- Rotatory Nystagmus Test: Normative Data for Spanish Adolescents and Adults

Study Overview
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Brief Summary
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The vestibulo-ocular reflex is the motor response of our eyes in the opposite direction to a translational or rotational movement of our head. The post-rotational nystagmus test (PRN) assesses the integrity of this reflex, thus assessing the perception of the vestibular system. The duration of this reflex after administering this test has been widely studied in children from 2 months to 12 years and 11 months of age. However, there is a knowledge gap from that age that the present study seeks to address.

Detailed Description
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The vestibulo-ocular reflex (VOR) is the motor response of our eyes in the opposite direction to a translational or rotational movement of our head. The post-rotational nystagmus test (PRN) assesses the integrity of this reflex, thus assessing the perception of the vestibular system. This system has an important role in our balance, stabilization of the visual field when our head moves, awareness of the position of our head in space, postural control and functions of the Autonomous Nervous System. The duration of this reflex after administering this test has been widely studied in children from 2 months to 12 years and 11 months of age. However, there is a knowledge gap from that age that the present study seeks to address. This article aims to explore the use of the PRN test for adolescent and adults, to prove if the duration of the VOR is longer in these population than in children. It will be also recollected personal data to study whether exposure to vestibular input influences its reactivity and perception.

Official Title
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Normative Data for Post-rotatory Nystagmus Test at Spanish Adolescent and Adult Population: a Transversal Study

Conditions
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Vestibular Function Tests, Nystagmus Vestibular

Intervention / Treatment
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* Diagnostic Test: Post-rotatory nystagmus test


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: People over 13 years of age. Spanish-speaking population. Signature of the informed consent. Exclusion Criteria: Diagnosis of a neurodevelopmental or neurological disorder. Being in occupational therapeutic treatment for balance or vestibular problems. Practice of sports in one previous hour. Adverse reaction to vestibular input such as vomiting, discoloration, feeling of unpleasantness or any other type of negative reaction before / during / after the administration of the NPR.

Ages Eligible for Study
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Minimum Age: 13 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Intervention/Treatment |
| --- |
|Diagnostic Test: Post-rotatory nystagmus test|The test is administrated with the person sit down with cross legs at a rotatory board, with the head positioned by the examiner in 30° of forward flexion. The position was maintained by the administration of the test. The administration consist in two administrations separate by one minute. Each administration consist in rotate the person 10 times in 20 seconds (the first 10 rotations in a counterclockwise direction in 20 s and the second 10 rotations in a clockwise direction in 20 s). After each administration the examiner counts the duration of the reflex in seconds.|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Duration of vestibular-ocular reflex after the administration of nystagmus post-rotatory test in adolescent and adult population | The post rotatory nystagmus test evaluates the duration of the vestibular-ocular reflex: how long its lats gives information about the perception of vestibular system. This reflex reflects the role of the vestibular system in ocular mechanisms (Mailloux et al., 2014). It is administered twice: clockwise and counterclockwise.After the administration the physiologic nystagmus appears, it is our vestibular-ocular reflex, and the examiner has to register the duration of it. | End of the nystagmus post rotatory test and end of the vestibular-ocular reflex | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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vestibular function tests, nystagmus, physiologic, adult, adolescent