Department of Physical Therapy, High Point University, High Point, NC,USA.
Division of Athletic Training, West Virginia University, Morgantown, WV,USA.
J Sport Rehabil. 2022 Aug 8;32(1):85-90. doi: 10.1123/jsr.2022-0026. Print 2023 Jan 1.
Women's volleyball requires frequent and repetitive jumping that when performed with altered biomechanics, including kinematic or kinetic asymmetry, may place the athlete at high risk for injury. This study identified and analyzed lower-extremity biomechanical asymmetries in college women's volleyball players during standard and sport-specific double-leg landing tasks.
Cross-sectional laboratory study.
Eighteen female college volleyball players were analyzed using standard 3D motion capture techniques during a drop vertical jump and an unanticipated lateral reactive jump task. Repeated-measures multivariate analysis of variance identified asymmetries in kinematic and kinetic variables of each task.
Average symmetry indices ranged from 9.3% to 31.3% during the drop vertical jump and 11.9% to 25.6% during the reactive jump task. During the drop vertical jump, the dominant limb exhibited lower knee abduction moments (P = .03), ankle dorsiflexion moments (P = .02), ankle eversion moments (P = .003) and vertical ground reaction forces (P = .03), and greater ankle inversion moments (P = .001). Both kinematic (λ = 0.27, P = .03) and kinetic (λ = 0.12, P = .008) asymmetries were identified during the reactive jump task. The dominant limb exhibited greater peak knee flexion (P = .003) and ankle dorsiflexion (P = .02) angles, and greater ankle dorsiflexion (P = .005) and inversion (P = .03) moments than the nondominant limb.
These asymmetries observed during double-leg landing tasks may predispose volleyball athletes to unilaterally higher ground reaction or muscle forces and ultimately a greater risk of injury during landing.
女子排球需要频繁且重复的跳跃，当运动生物力学发生改变，包括运动学或动力学不对称时，运动员可能会面临高受伤风险。本研究在标准和特定运动的双腿落地任务中，确定并分析了女子大学生排球运动员下肢的生物力学不对称。
横断面实验室研究。
18 名女性大学生排球运动员在垂直跳和意外侧向反应跳任务中，使用标准的 3D 运动捕捉技术进行分析。重复测量多元方差分析确定了每个任务的运动学和动力学变量的不对称性。
在垂直跳中，平均对称指数在 9.3%至 31.3%之间，在反应跳中在 11.9%至 25.6%之间。在垂直跳中，优势肢体的膝关节外展力矩较低（P=0.03）、踝关节背屈力矩较低（P=0.02）、踝关节外翻力矩较低（P=0.003）和垂直地面反作用力较大（P=0.03），并且踝关节内翻力矩较大（P=0.001）。在反应跳中，无论是运动学（λ=0.27，P=0.03）还是动力学（λ=0.12，P=0.008），都存在不对称性。优势肢体的膝关节屈曲（P=0.003）和踝关节背屈（P=0.02）角度更大，踝关节背屈（P=0.005）和内翻（P=0.03）力矩也更大。
在双腿落地任务中观察到的这些不对称性可能使排球运动员单侧的地面反作用力或肌肉力增加，最终在落地时受伤的风险更大。
