Diese Seite wurde automatisch übersetzt und die Genauigkeit der Übersetzung wird nicht garantiert. Bitte wende dich an die englische Version für einen Quelltext.

Eye-Hand Cross-Dominance and Upper Extremity Performance in Volleyball Players

21. August 2026 aktualisiert von: 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.

Studienübersicht

Status

Rekrutierung

Bedingungen

Intervention / Behandlung

Studientyp

Beobachtungs

Einschreibung (Geschätzt)

30

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienkontakt

Studienorte

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

  • Erwachsene

Akzeptiert gesunde Freiwillige

Ja

Probenahmeverfahren

Wahrscheinlichkeitsstichprobe

Studienpopulation

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.

Beschreibung

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.

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

Kohorten und Interventionen

Gruppe / Kohorte
Intervention / Behandlung
Group 1: Volleyball Players With Crossed Eye-Hand Dominance
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.
Group 2: Volleyball Players Without Crossed Eye-Hand Dominance
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.

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Dominant Eye
Zeitfenster: 4 weeks
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.
4 weeks
Bilateral Shoulder Muscle Strength
Zeitfenster: 4 weeks
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.
4 weeks
Bilateral Elbow Muscle Strength
Zeitfenster: 4 weeks
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.
4 weeks
Bilateral Handgrip Strength
Zeitfenster: 4 weeks
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.
4 weeks
Hand-Eye Coordination
Zeitfenster: 4 weeks
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.
4 weeks

Sekundäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Medicine Ball Throw Distance
Zeitfenster: 4 weeks
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.
4 weeks
Closed Kinetic Chain Upper Extremity Stability Test Score
Zeitfenster: 4 weeks
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.
4 weeks
Scapular Muscular Endurance Time
Zeitfenster: 4 weeks
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.
4 weeks
Upper Quarter Y-Balance Test Reach Distance
Zeitfenster: 4 weeks
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.
4 weeks
Light-Based Reaction Time
Zeitfenster: 4 weeks
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.
4 weeks

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Sponsor

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn (Geschätzt)

30. August 2026

Primärer Abschluss (Geschätzt)

15. November 2026

Studienabschluss (Geschätzt)

30. November 2026

Studienanmeldedaten

Zuerst eingereicht

21. August 2026

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

21. August 2026

Zuerst gepostet (Tatsächlich)

25. August 2026

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

25. August 2026

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

21. August 2026

Zuletzt verifiziert

1. August 2026

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Andere Studien-ID-Nummern

  • 2026/01

Arzneimittel- und Geräteinformationen, Studienunterlagen

Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt

Nein

Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt

Nein

Diese Informationen wurden ohne Änderungen direkt von der Website clinicaltrials.gov abgerufen. Wenn Sie Ihre Studiendaten ändern, entfernen oder aktualisieren möchten, wenden Sie sich bitte an register@clinicaltrials.gov. Sobald eine Änderung auf clinicaltrials.gov implementiert wird, wird diese automatisch auch auf unserer Website aktualisiert .