男性长跑训练运动员等速膝关节扭矩不对称的证据
EVIDENCE FOR ISOKINETIC KNEE TORQUE ASYMMETRIES IN MALE LONG DISTANCE-TRAINED RUNNERS.
作者信息
Dellagrana Rodolfo A, Diefenthaeler Fernando, Carpes Felipe P, Hernandez Sara G, de Campos Wagner
机构信息
Laboratory of Biomechanics, Federal University of Santa Catarina, Florianópolis, SC, Brazil.
Laboratory of Neuromechanics, Federal University of Pampa, Uruguaiana, RS, Brazil.
出版信息
Int J Sports Phys Ther. 2015 Aug;10(4):514-9.
PURPOSE/BACKGROUND: Strength asymmetries are related to knee injuries and such injuries are frequently observed among runners. The purpose of this study was to examine whether long-distance runners have symmetric performance during knee isokinetic testing at two angular velocities.
METHODS
Twenty-three healthy and well-trained male long-distance runners performed open-chain isokinetic trials for assessment of concentric quadriceps and hamstrings contractions at velocities of 60 °·s(-1) and 240 °·s(-1). Data were compared between the lower limbs at different velocities.
RESULTS
Peak torque and total work were similar between the limbs. Asymmetry was observed for knee flexor power at 240 °·s(-1) (237 ± 45 W and 205 ± 53 W, in the preferred and non-preferred limb, respectively). Asymmetry indexes for flexor power were different between the velocities tested (13.1% and 2.21% for 240 °·s(-1) and 60 °·s(-1), respectively).
CONCLUSION
A limb asymmetry was observed among runners for knee flexor power, mainly at higher angular velocities (240 °·s(-1)). In addition, H/Q ratios were observed to be contraction velocity dependent.
LEVEL OF EVIDENCE
目的/背景：力量不对称与膝关节损伤相关，且此类损伤在跑步者中经常被观察到。本研究的目的是检验长跑运动员在两个角速度下进行膝关节等速测试时是否具有对称表现。
方法
23名健康且训练有素的男性长跑运动员进行了开链等速试验，以评估在60°·s⁻¹和240°·s⁻¹速度下股四头肌和腘绳肌的向心收缩。对不同速度下双下肢的数据进行比较。
结果
双下肢之间的峰值扭矩和总功相似。在240°·s⁻¹时观察到膝关节屈肌力量不对称（优势侧和非优势侧分别为237±45W和205±53W）。屈肌力量的不对称指数在测试速度之间有所不同（240°·s⁻¹和60°·s⁻¹时分别为13.1%和2.21%）。
结论
在跑步者中观察到膝关节屈肌力量存在肢体不对称，主要出现在较高角速度（240°·s⁻¹）时。此外，观察到H/Q比值取决于收缩速度。
证据水平
3级。
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