Department of Orthopaedic Surgery, Innsbruck Medical University, Anichstrasse 35, 6020, Innsbruck, Austria.
Knee Surg Sports Traumatol Arthrosc. 2012 Mar;20(3):510-6. doi: 10.1007/s00167-011-1567-0. Epub 2011 Jun 7.
To investigate for gender differences during eccentric leg-press exercise. Tears of the anterior cruciate ligament (ACL) are considered to be related to eccentric tasks, altered neuromuscular control (e.g., reduced co-contraction of hamstrings), and increased knee abduction (valgus alignment). Based on these observations and the fact that ACL tears are more common in women, it was hypothesized that men and women differ significantly with regard to key parameters of force, knee stabilization, and muscle activity when exposed to maximum eccentric leg extension.
Thirteen women and thirteen men were matched for age and physical activity. They performed maximum isokinetic eccentric leg-pressing against footplates of varied stability. The latter was done because earlier studies had shown that perturbational test conditions might be relevant in respect of ACL injuries. Key parameters of force, frontal plane knee stabilization, and muscle recruitment of significant muscles crossing the knee were recorded.
The 'force stabilization deficit' (difference between maximum forces under normal and perturbed leg-pressing) did not differ significantly between genders. Likewise, parameters of muscle activity and frontal plane leg stabilization revealed no significant differences between men and women.
This study is novel, in that gender differences in parameters of force, muscle activity, and leg kinematic were investigated during functional conditions of eccentric leg-pressing. No gender differences were observed in the measured parameters. However, the conclusion should be viewed with caution because the findings concurred with, but also contrasted, previous research in this field.
Diagnostic study, Level III.
研究在离心腿压运动中存在性别差异。前交叉韧带（ACL）的撕裂被认为与离心任务、神经肌肉控制改变（例如，腘绳肌协同收缩减少）以及膝关节外展（外翻对齐）有关。基于这些观察结果以及 ACL 撕裂在女性中更为常见的事实，可以假设男性和女性在暴露于最大离心腿伸展时，在力、膝关节稳定和肌肉活动的关键参数方面存在显著差异。
13 名女性和 13 名男性按年龄和身体活动进行匹配。他们使用不同稳定性的脚踏板进行最大等速离心腿压。之所以这样做，是因为早期的研究表明，扰动测试条件可能与 ACL 损伤有关。记录了力、额状面膝关节稳定和穿过膝关节的重要肌肉募集的关键参数。
正常和受扰腿压下的最大力之间的“力稳定缺陷”（difference between maximum forces under normal and perturbed leg-pressing）在性别之间没有显著差异。同样，肌肉活动和额状面腿部稳定的参数也没有显示出男性和女性之间的显著差异。
本研究是新颖的，因为在离心腿压的功能条件下，研究了力、肌肉活动和腿部运动学参数的性别差异。在测量参数方面没有观察到性别差异。然而，应该谨慎看待这一结论，因为研究结果与该领域的先前研究一致，但也存在差异。
诊断研究，III 级。
