Abstract：
The aim of the present study was to compare shoulder internal rotator and external rotator isokinetic parameters in concentric and eccentric contractions between volleyball players with and without a history of shoulder injury. Thirty male volleyball players participated of this study, divided into two groups: with a history of injury (WHI) in the dominant shoulder (11 athletes; age: 19.4 ± 3.6 years) and no history of injury (NHI) (19 athletes; age: 18.3 ± 2.9 years). The peak torque (PT) and concentric (Con) and eccentric (Ecc) PT angles in internal (IR) and external rotation (ER) at velocities of 60 and 180°/s were measured. The conventional (Con_ER:Con_IR), functional spiking (Ecc_ER:Con_IR), and cocking ratios (Ecc_IR:Con_ER) were calculated. No significant differences were found between groups for PT and PT angle, or for conventional, functional spiking, and cocking ratios. However, the spiking ratio was considered low (0.87) in the WHI group. Moreover, for the spiking ratio in the WHI group, PT at 60°/s occurred at different angles. We conclude that previous injury in shoulder did not affect the peak torque, as well as conventional, spiking or cocking ratio. However, the PT angles at 60°/s used to calculate the spiking ratio shifted due the prior injury.
摘要：
本研究的目的是比较有和没有肩伤史的排球运动员在同心和偏心收缩中的肩内旋转器和外旋转器等速参数。30名男子排球运动员参加了这项研究，分为两组：具有优势肩损伤史（WHI）（11名运动员；年龄：19.4±3.6岁）和无损伤史（NHI）（19名运动员；年龄：18.3±2.9岁）。测量了以60和180°/s的速度在内部（IR）和外部旋转（ER）中的峰值扭矩（PT）以及同心（Con）和偏心（Ecc）PT角。常规(Con_ER:Con_IR)，函数尖峰(Ecc_ER:Con_IR)，计算了翘起比(Ecc_IR:Con_ER)。PT和PT角度组间无显著差异，或者传统的，功能性尖峰，和翘尾比率。然而,在WHI组中,加标率被认为较低(0.87).此外，对于WHI组中的尖峰比率，在60°/s的PT发生在不同的角度。我们得出的结论是，以前的肩部受伤并不影响峰值扭矩，除了常规，尖峰或翘起比率。然而,用于计算由于先前受伤而移位的尖峰比的60°/s时的PT角。
