Eye-Hand Cross-Dominance and Upper Extremity Performance in Volleyball Players
21 augusti 2026 uppdaterad av: Kubra Kardes, Istinye University
Comparison of Upper Extremity Muscle Strength and Motor Performance Between Volleyball Players With and Without Crossed Eye-Hand Dominance
Eye and hand dominance may influence visuomotor coordination, motor control, and upper extremity performance in athletes. Crossed eye-hand dominance occurs when the dominant eye and dominant hand are located on opposite sides of the body. However, evidence regarding the relationship between crossed eye-hand dominance and upper extremity performance in volleyball players remains limited.
This observational cross-sectional study aims to compare upper extremity muscle strength and motor performance between volleyball players with and without crossed eye-hand dominance. Participants' eye and hand dominance will be determined using standardized assessments. Upper extremity muscle strength and motor performance outcomes will then be measured and compared between the two groups.
Studieöversikt
Status
Rekrytering
Betingelser
Studietyp
Observationell
Inskrivning (Beräknad)
30
Kontakter och platser
Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.
Studiekontakt
- Namn: Kubra Kardes, Asst. Prof.
- Telefonnummer: 05387115631
- E-post: kubrakoce@gmail.com
Studieorter
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Istanbul, Turkiet (Türkiye), 34010
- Rekrytering
- Istinye University
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Kontakt:
- Kubra Kardes, Asst.Prof
- Telefonnummer: 05387115631
- E-post: kubrakoce@gmail.com
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Deltagandekriterier
Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.
Urvalskriterier
Åldrar som är berättigade till studier
- Vuxen
Tar emot friska volontärer
Ja
Testmetod
Sannolikhetsprov
Studera befolkning
Male and female volleyball players aged 18 to 30 years who have regularly participated in volleyball for at least three years and currently train at least three days per week will be recruited.
Beskrivning
Inclusion Criteria:
- Aged between 18 and 30 years.
- Male or female volleyball player.
- At least three years of active volleyball participation.
- Currently training at least three days per week.
- No upper extremity injury within the previous six months.
- Normal or corrected-to-normal visual acuity with eyeglasses or contact lenses.
- Willing to participate and able to provide written informed consent.
Exclusion Criteria:
- History or presence of an acute or chronic musculoskeletal disorder that may affect study assessments.
- Presence of a neurological or vestibular system disorder.
- Presence of visual field loss, strabismus, or a severe refractive error that cannot be adequately corrected.
- History of shoulder, elbow, or hand surgery within the previous six months.
- Not currently participating regularly in volleyball or structured exercise.
Studieplan
Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.
Hur är studien utformad?
Designdetaljer
Kohorter och interventioner
Grupp / Kohort |
Intervention / Behandling |
|---|---|
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Group 1: Volleyball Players With Crossed Eye-Hand Dominance
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Volleyball players whose dominant eye and dominant hand are on opposite sides of the body.
For example, right-eye dominance with left-hand dominance or left-eye dominance with right-hand dominance.
Participants will undergo upper extremity muscle strength and motor performance assessments.
No intervention will be administered.
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Group 2: Volleyball Players Without Crossed Eye-Hand Dominance
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Volleyball players whose dominant eye and dominant hand are on the same side of the body.
For example, right-eye dominance with right-hand dominance or left-eye dominance with left-hand dominance.
Participants will undergo the same upper extremity muscle strength and motor performance assessments.
No intervention will be administered.
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Vad mäter studien?
Primära resultatmått
Resultatmått |
Åtgärdsbeskrivning |
Tidsram |
|---|---|---|
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Dominant Eye
Tidsram: 4 weeks
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Eye dominance will be determined using the Miles Test.
The participant will focus on a distant target with both eyes open and will then close each eye separately.
The eye with which the target remains centered will be classified as the dominant eye.
Eye dominance will be used with hand dominance to classify participants as having crossed or non-crossed eye-hand dominance.
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4 weeks
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Bilateral Shoulder Muscle Strength
Tidsram: 4 weeks
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Bilateral shoulder flexion, extension, and abduction muscle strength will be measured using a validated handheld myometer.
Measurements will be recorded separately for the right and left sides.
Higher force values indicate greater shoulder muscle strength, whereas lower values indicate lower muscle strength.
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4 weeks
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Bilateral Elbow Muscle Strength
Tidsram: 4 weeks
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Bilateral elbow flexion and extension muscle strength will be measured using a validated handheld myometer.
Measurements will be recorded separately for the right and left sides.
Higher force values indicate greater elbow muscle strength, whereas lower values indicate lower muscle strength.
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4 weeks
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Bilateral Handgrip Strength
Tidsram: 4 weeks
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Handgrip strength will be measured bilaterally using a digital hand dynamometer.
Three measurements will be performed for each hand, and the mean value will be recorded.
Higher values indicate greater handgrip strength, whereas lower values indicate lower handgrip strength.
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4 weeks
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Hand-Eye Coordination
Tidsram: 4 weeks
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Hand-eye coordination will be assessed using the Alternate-Hand Wall Toss Test.
The participant will throw a ball against a wall with one hand, catch it with the opposite hand, and repeat the sequence by alternating hands.
The total number of successful throws and catches completed within 30 seconds will be recorded.
A higher number indicates better hand-eye coordination and motor performance, whereas a lower number indicates poorer performance.
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4 weeks
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Sekundära resultatmått
Resultatmått |
Åtgärdsbeskrivning |
Tidsram |
|---|---|---|
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Medicine Ball Throw Distance
Tidsram: 4 weeks
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Upper extremity explosive power will be assessed using the Medicine Ball Throw Test.
The participant will sit with the back supported against a wall and the legs extended and will throw the medicine ball as far as possible.
The longest valid throwing distance will be recorded in meters.
A longer distance indicates greater upper extremity explosive power.
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4 weeks
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Closed Kinetic Chain Upper Extremity Stability Test Score
Tidsram: 4 weeks
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Upper extremity functional stability, strength, power, and endurance will be assessed using the Closed Kinetic Chain Upper Extremity Stability Test.
The participant will assume a push-up position with the hands placed on two markers positioned 90 centimeters apart.
The total number of valid alternating touches performed within the specified test period will be recorded.
A higher number of touches indicates better upper extremity functional performance and stability.
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4 weeks
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Scapular Muscular Endurance Time
Tidsram: 4 weeks
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Scapular stabilizer muscle endurance will be assessed using the Scapular Muscular Endurance Test.
An appropriately sized wooden rod will be positioned between the participant's elbows while the scapulae are maintained in a neutral position.
The duration for which the participant can maintain the standardized position will be recorded in seconds.
A longer duration indicates greater scapular muscular endurance.
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4 weeks
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Upper Quarter Y-Balance Test Reach Distance
Tidsram: 4 weeks
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Upper extremity and trunk balance, mobility, and stability will be assessed using the Upper Quarter Y-Balance Test.
Testing will begin with the non-dominant hand as the reaching hand.
Maximum reach distances in the medial, inferolateral, and superolateral directions will be recorded.
Greater reach distances and higher composite scores indicate better upper extremity dynamic balance and functional stability.
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4 weeks
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Light-Based Reaction Time
Tidsram: 4 weeks
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Reaction time and neuromuscular control will be assessed using the BlazePod light-based reaction system.
Participants will respond to randomly activated visual stimuli according to a standardized testing protocol.
Reaction time will be recorded in milliseconds.
A shorter reaction time indicates faster visual-motor responses, whereas a longer reaction time indicates slower responses.
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4 weeks
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Samarbetspartners och utredare
Det är här du hittar personer och organisationer som är involverade i denna studie.
Sponsor
Studieavstämningsdatum
Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.
Studera stora datum
Studiestart (Beräknad)
30 augusti 2026
Primärt slutförande (Beräknad)
15 november 2026
Avslutad studie (Beräknad)
30 november 2026
Studieregistreringsdatum
Först inskickad
21 augusti 2026
Först inskickad som uppfyllde QC-kriterierna
21 augusti 2026
Första postat (Faktisk)
25 augusti 2026
Uppdateringar av studier
Senaste uppdatering publicerad (Faktisk)
25 augusti 2026
Senaste inskickade uppdateringen som uppfyllde QC-kriterierna
21 augusti 2026
Senast verifierad
1 augusti 2026
Mer information
Termer relaterade till denna studie
Andra studie-ID-nummer
- 2026/01
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