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
Studieoversikt
Status
Status
Forhold
Forhold
Intervensjon / Behandling
Intervensjon / Behandling
Detaljert beskrivelse
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
Registrering (Faktiske)
Registrering
Kontakter og plasseringer
Studiesteder
-
-
Tennessee
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Nashville, Tennessee, Forente stater, 37212
- Belmont University
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Nashville, Tennessee, Forente stater, 37232
- Vanderbilt Pi Beta Phi Rehabilitation Institute
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-
Deltakelseskriterier
Kvalifikasjonskriterier
Kvalifikasjonskriterier
Alder som er kvalifisert for studier
Tar imot friske frivillige
Kjønn som er kvalifisert for studier
Prøvetakingsmetode
Studiepopulasjon
Health individuals by self-report
Beskrivelse
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
Studieplan
Hvordan er studiet utformet?
Designdetaljer
- Observasjonsmodeller: OTHER
- Tidsperspektiver: PROSPECTIVE
Hva måler studien?
Primære resultatmål
Primære resultatmål
Resultatmål |
Tiltaksbeskrivelse |
Tidsramme |
|---|---|---|
|
Computerized gaze stabilization and dynamic visual acuity
Tidsramme: baseline
|
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
|
Samarbeidspartnere og etterforskere
Sponsor
Sponsor
Samarbeidspartnere
Samarbeidspartnere
Etterforskere
Etterforskere
- Hovedetterforsker: Cathey Norton, DPT, Belmont University College of Health Sciences
- Hovedetterforsker: Kathryn Lewis, DPT, Pi Beta Phi Rehabilitation Institute
Publikasjoner og nyttige lenker
Generelle publikasjoner
- 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.
Studierekorddatoer
Studer hoveddatoer
Studiestart (Faktiske)
Studiestart
Primær fullføring (Faktiske)
Primær fullføring
Studiet fullført (Faktiske)
Studiet fullført
Datoer for studieregistrering
Først innsendt
Først innsendt
Først innsendt som oppfylte QC-kriteriene
Først innsendt som oppfylte QC-kriteriene
Først lagt ut (Faktiske)
Først lagt ut
Oppdateringer av studieposter
Sist oppdatering lagt ut (Faktiske)
Sist oppdatering lagt ut
Siste oppdatering sendt inn som oppfylte QC-kriteriene
Siste oppdatering sendt inn som oppfylte QC-kriteriene
Sist bekreftet
Sist bekreftet
Mer informasjon
Begreper knyttet til denne studien
Andre studie-ID-numre
Andre studie-ID-numre
- 1288
Plan for individuelle deltakerdata (IPD)
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Legemiddel- og utstyrsinformasjon, studiedokumenter
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