Eye-Hand Cross-Dominance and Upper Extremity Performance in Volleyball Players
21 août 2026 mis à jour par: 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.
Aperçu de l'étude
Statut
Recrutement
Les conditions
Type d'étude
Observationnel
Inscription (Estimé)
30
Contacts et emplacements
Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.
Coordonnées de l'étude
- Nom: Kubra Kardes, Asst. Prof.
- Numéro de téléphone: 05387115631
- E-mail: kubrakoce@gmail.com
Lieux d'étude
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Istanbul, Turquie (Türkiye), 34010
- Recrutement
- Istinye University
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Contact:
- Kubra Kardes, Asst.Prof
- Numéro de téléphone: 05387115631
- E-mail: kubrakoce@gmail.com
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-
Critères de participation
Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.
Critère d'éligibilité
Âges éligibles pour étudier
- Adulte
Accepte les volontaires sains
Oui
Méthode d'échantillonnage
Échantillon de probabilité
Population étudiée
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.
La description
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.
Plan d'étude
Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.
Comment l'étude est-elle conçue ?
Détails de conception
Cohortes et interventions
Groupe / Cohorte |
Intervention / Traitement |
|---|---|
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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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Que mesure l'étude ?
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Dominant Eye
Délai: 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
Délai: 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
Délai: 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
Délai: 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
Délai: 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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Mesures de résultats secondaires
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Medicine Ball Throw Distance
Délai: 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
Délai: 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
Délai: 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
Délai: 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
Délai: 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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Collaborateurs et enquêteurs
C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.
Parrainer
Dates d'enregistrement des études
Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.
Dates principales de l'étude
Début de l'étude (Estimé)
30 août 2026
Achèvement primaire (Estimé)
15 novembre 2026
Achèvement de l'étude (Estimé)
30 novembre 2026
Dates d'inscription aux études
Première soumission
21 août 2026
Première soumission répondant aux critères de contrôle qualité
21 août 2026
Première publication (Réel)
25 août 2026
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Réel)
25 août 2026
Dernière mise à jour soumise répondant aux critères de contrôle qualité
21 août 2026
Dernière vérification
1 août 2026
Plus d'information
Termes liés à cette étude
Autres numéros d'identification d'étude
- 2026/01
Informations sur les médicaments et les dispositifs, documents d'étude
Étudie un produit pharmaceutique réglementé par la FDA américaine
Non
Étudie un produit d'appareil réglementé par la FDA américaine
Non
Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .