The impact of the hamstrings-to-quadriceps ratio on sport movement performance has not been sufficiently described. However, it seems that in movements involving eccentric-concentric muscular contractions, a higher hamstrings-to-quadriceps ratio should have a positive impact on human movement performance. The present study is aimed at identifying relationships between the hamstrings-to-quadriceps ratio and variables describing countermovement and drop jumps. The study was carried out in a group of 14 female soccer players. The tests were conducted using a Kistler force plate, an SG electrogoniometer, and the Biodex System 4 Pro dynamometer. Each player performed three countermovement jumps (CMJ) and three drop jumps (DJ) from heights of 15, 30, 45, and 60 cm. The peak torques of knee extensors and flexors were measured in isometric conditions and in isokinetic conditions at angular velocities of 30^o/s, 60^o/s, 90^o/s, and 120^o/s. Statistically significant relationships were found between the variables that describe CMJ, DJ 15, DJ 30, and hamstrings-to-quadriceps ratio at some, though not all, of the angular velocities measured. No significant relationships were found between the hamstrings-to-quadriceps ratio and variables that describe DJ 45 and DJ 60. The heights of CMJ, DJ 15, and DJ 30 were increased with higher hamstrings-to-quadriceps ratios. Analogous relationships were found between the hamstrings-to-quadriceps ratio and relative mechanical power during the take-off phase of the CMJ. Significant relationships between the hamstrings-to-quadriceps ratio and variables that describe vertical jump are likely to be observed if adequate angular velocity is used in the measurement of muscle torque.

中文翻译：

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Ham绳肌与肱四头肌比例与描述反向运动和跌倒跳跃的变量之间的关系。

腿筋股四头肌比例对运动表现的影响尚未充分描述。但是，似乎在涉及偏心-同心肌肉收缩的运动中，较高的绳肌与股四头肌之比应该会对人体运动表现产生积极影响。本研究旨在确定绳肌与股四头肌比例与描述反向运动和跌倒跳跃的变量之间的关系。该研究是在14名女足球运动员的小组中进行的。使用Kistler测力板，SG电动测角计和Biodex System 4 Pro测功机进行测试。每个玩家在15、30、45和60厘米的高度上执行了三个反跳动作（CMJ）和三个掉落动作（DJ）。^o / s，60 ^o / s，90 ^o / s和120 ^o/ s。在一些（并非全部）测得的角速度下，描述CMJ，DJ 15，DJ 30和绳肌与股四头肌比例的变量之间发现了统计学上显着的关系。绳肌与股四头肌比例与描述DJ 45和DJ 60的变量之间没有发现显着关系。随着较高的绳肌与股四头肌比例，CMJ，DJ 15和DJ 30的高度会增加。在CMJ起飞阶段，绳肌与股四头肌的比例与相对机械功率之间存在相似的关系。如果在测量肌肉扭矩时使用足够的角速度，则可能会观察到腿筋与股四头肌比例与描述垂直跳动的变量之间的重要关系。