Normative Values for Instrumented Gaze Stabilization Test and Dynamic Visual Acuity Test Following Fatigue
The goal of this observational study is to learn how well normal individuals can see when they move their head before and after activity.
The main question it aims to answer are:
• Does being tired affect how well a person can see when moving their head.
Participants will Have vision testing when the head is still Have vision tested when the head is moving Walk on a treadmill until tired Have vision tested again while the head is moving
Studie Overzicht
Toestand
Toestand
Conditie
Conditie
Interventie / Behandeling
Interventie / Behandeling
Gedetailleerde beschrijving
Individuals with vestibular dysfunction, often report visual blurriness and dizziness. This is often due to gaze instability with walking or with head turns. The cause of this dizziness is due to disruption of the vestibular ocular reflex (VOR). The VOR functions to keep the eyes stabilized on a target while the head is moving. Currently, the best way to measure the integrity of the VOR is with the gaze stabilization test (GST) and the Dynamic Visual Acuity Test (DVAT). The GST is a computerized test that measures the maximum head velocity one can turn their head while maintaining visual fixation on a target. Head velocity is measured in degrees per second. The GST provides information regarding the functional capacity of the vestibulo-ocular reflex. The GST is performed by a clinician with the patient at rest. The dynamic visual acuity test (DVAT) is an established clinical measure of vestibular function. However, research states that high-intensity exercise evokes neurological symptoms in healthy individuals. Clinically, therapists see a drop in gaze stabilization with fatigue. Currently, there are no normative data for gaze stabilization following fatigue. Normative values for how fatigue affects GST and DVA will provide objective information for the function of the vestibular-ocular system, allowing for more accurate management and interventions of individuals with vestibular dysfunction and concussion.
Studietype
Studietype
Inschrijving (Werkelijk)
Inschrijving
Contacten en locaties
Studie Locaties
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Tennessee
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Nashville, Tennessee, Verenigde Staten, 37212
- Belmont University
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Nashville, Tennessee, Verenigde Staten, 37232
- Vanderbilt Pi Beta Phi Rehabilitation Institute
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Deelname Criteria
Geschiktheidscriteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
Accepteert gezonde vrijwilligers
Geslachten die in aanmerking komen voor studie
Bemonsteringsmethode
Studie Bevolking
Health individuals by self-report
Beschrijving
Inclusion Criteria:
- the ability to participate in exercise testing on a treadmill up to 85% of maximal heart rate and sufficient corrected visual acuity to identify letters on a computerized vision testing system
Exclusion Criteria:
- documented history of known cardiovascular disease, including ischemic heart diseases, heart failure, cardiac surgery, structural or valvular heart diseases, major arrhythmias, defibrillator or pacemaker, congenital heart diseases, cerebrovascular diseases, vestibular impairment, and peripheral vascular diseases
- use of any HR attenuating or rhythm-modifying agents, including beta-blockers, calcium channel blockers, sotalol, and amiodarone, at the time of the exercise test
- reported concussions in the last 3 months
- History of a vestibular disorder
- musculoskeletal injuries/conditions that limit participation in vigorous exercise
- Exclusion criteria will be verified by the investigators via self-report on AHA/ACSM Health/Fitness Facility Pre-Participation Screening Questionnaire
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Observatiemodellen: OTHER
- Tijdsperspectieven: PROSPECTIVE
Wat meet het onderzoek?
Primaire uitkomstmaten
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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Computerized gaze stabilization and dynamic visual acuity
Tijdsspanne: baseline
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Participants will perform Gaze stabilization measuring degrees per second of head movement and Dynamic visual acuity testing in logMAR units, using the Bertec Vision Advantage system administered by investigators. All investigators will be trained in the administration prior to data collection on subjects. Administration of testing will be under the supervision of study investigators. Testing includes wearing a wireless, lightweight head-worn sensor that tracks head movement speeds while identifying letters of various sizes on a laptop computer screen. This assesses the vestibulo-ocular reflex. Data will be collected on dynamic visual acuity and gaze stabilization during testing. |
baseline
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Medewerkers en onderzoekers
Sponsor
Sponsor
Medewerkers
Medewerkers
Onderzoekers
Onderzoekers
- Hoofdonderzoeker: Cathey Norton, DPT, Belmont University College of Health Sciences
- Hoofdonderzoeker: Kathryn Lewis, DPT, Pi Beta Phi Rehabilitation Institute
Publicaties en nuttige links
Algemene publicaties
- Patterson JN, Murphy AM, Honaker JA. Examining Effects of Physical Exertion on the Dynamic Visual Acuity Test in Collegiate Athletes. J Am Acad Audiol. 2017 Jan;28(1):36-45. doi: 10.3766/jaaa.15110.
- Marquez C, Lininger M, Raab S. ESTABLISHING NORMATIVE CHANGE VALUES IN VISUAL ACUITY LOSS DURING THE DYNAMIC VISUAL ACUITY TEST. Int J Sports Phys Ther. 2017 Apr;12(2):227-232.
- Massingale S, Alexander A, Gerkin R, Leddon C, McQueary E, Allred RC, Pardini JE. Gaze stability in the elite athlete: A normative observational study. J Vestib Res. 2019;29(5):221-228. doi: 10.3233/VES-190678.
- Meldrum D, Jahn K. Gaze stabilisation exercises in vestibular rehabilitation: review of the evidence and recent clinical advances. J Neurol. 2019 Sep;266(Suppl 1):11-18. doi: 10.1007/s00415-019-09459-x. Epub 2019 Aug 5.
Studie record data
Bestudeer belangrijke data
Studie start (Werkelijk)
Studie start
Primaire voltooiing (Werkelijk)
Primaire voltooiing
Studie voltooiing (Werkelijk)
Studie voltooiing
Studieregistratiedata
Eerst ingediend
Eerst ingediend
Eerst ingediend dat voldeed aan de QC-criteria
Eerst ingediend dat voldeed aan de QC-criteria
Eerst geplaatst (Werkelijk)
Eerst geplaatst
Updates van studierecords
Laatste update geplaatst (Werkelijk)
Laatste update geplaatst
Laatste update ingediend die voldeed aan QC-criteria
Laatste update ingediend die voldeed aan QC-criteria
Laatst geverifieerd
Laatst geverifieerd
Meer informatie
Termen gerelateerd aan deze studie
Andere studie-ID-nummers
Andere studie-ID-nummers
- 1288
Plan Individuele Deelnemersgegevens (IPD)
Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?
Informatie over medicijnen en apparaten, studiedocumenten
Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel
Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct
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