Comparison of Upper Extremity Muscle Strength and Motor Performance Between Volleyball Players With and Without Crossed Eye-Hand Dominance
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 30
- 试验地点
- 1
- 主要终点
- Dominant Eye
研究概览
简要总结
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.
研究设计
- 研究类型
- Observational
- 观察模型
- Case Crossover
- 时间视角
- Cross Sectional
入排标准
- 年龄范围
- 18 Years 至 30 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •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.
排除标准
- •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.
研究组 & 干预措施
Group 1: Volleyball Players With Crossed Eye-Hand Dominance
干预措施: Volleyball Players With Crossed Eye-Hand Dominance (Other)
Group 2: Volleyball Players Without Crossed Eye-Hand Dominance
干预措施: Volleyball Players Without Crossed Eye-Hand Dominance (Other)
结局指标
主要结局
Dominant Eye
时间窗: 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.
Bilateral Shoulder Muscle Strength
时间窗: 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.
Bilateral Elbow Muscle Strength
时间窗: 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.
Bilateral Handgrip Strength
时间窗: 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.
Hand-Eye Coordination
时间窗: 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.
次要结局
- Medicine Ball Throw Distance(4 weeks)
- Closed Kinetic Chain Upper Extremity Stability Test Score(4 weeks)
- Scapular Muscular Endurance Time(4 weeks)
- Upper Quarter Y-Balance Test Reach Distance(4 weeks)
- Light-Based Reaction Time(4 weeks)
研究者
Kubra Kardes
Asst. Prof.
Istinye University