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首页> 外文期刊>Journal of athletic training >Contribution of knee flexor and extensor strength on sex-specific energy absorption and torsional joint stiffness during drop jumping.
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Contribution of knee flexor and extensor strength on sex-specific energy absorption and torsional joint stiffness during drop jumping.

机译：膝盖屈肌和伸肌强度对跳跃期间性别特异性能量吸收和扭转关节刚度的贡献。

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CONTEXT: Lower extremity injury often occurs during abrupt deceleration when attempting to change the body's direction. Although sex-specific biomechanics have been implicated in the greater risk of acute knee injury in women than in men, it is unknown if sex differences in thigh strength affect sex-specific energy absorption and torsional joint stiffness patterns. OBJECTIVE: To determine sex differences in energy absorption patterns and joint stiffnesses of the lower extremity during a drop jump and to determine if these sex differences were predicted by knee extensor and flexor strength. DESIGN: Cross-sectional study. SETTING: Laboratory environment. PATIENTS OR OTHER PARTICIPANTS: Recreationally active, college-aged students (41 women: age = 22.1 +/- 2.9 years, height = 1.63 +/- 0.07 m, mass = 59.3 +/- 8.0 kg; 40 men: age = 22.4 +/- 2.8 years, height = 1.77 +/- 0.1 m, mass = 80.9 +/- 14.1 kg). INTERVENTION(S): Participants performed knee flexor and extensor maximal voluntary isometric contractions followed by double-leg drop-jump landings. MAIN OUTCOME MEASURE(S): Lower extremity joint energetics (J x N(-1) x m(-1)) and torsional joint stiffnesses (Nm x N(-1) x m(-1) x degrees(-1)) were calculated for the hip, knee, and ankle during the initial landing phase. Body weight was measured in newtons and height was measured in meters. Sex comparisons were made and sex-specific regressions determined if thigh muscle strength (Nm/kg) predicted sagittal-plane landing energetics and stiffnesses. RESULTS: Women absorbed 69% more knee energy and had 36% less hip torsional stiffness than men. In women, greater knee extensor strength predicted greater knee energy absorption (R(2) = 0.11, P = .04), and greater knee flexor strength predicted greater hip torsional stiffness (R(2) = 0.12, P = .03). CONCLUSIONS: Sex-specific biomechanics during the deceleration phase of a drop jump revealed that women used a strategy to attempt to decrease system stiffness. Additionally, only female strength values were predictive of landing energetics and stiffnesses. These findings collectively demonstrated that the task may have been more difficult for women, resulting in a different movement strategy among those with different levels of thigh strength to safely complete the task. Future researchers should look at other predictive factors of observed sex differences.
机译：背景：在试图改变身体方向时，突然减速期间通常发生下肢损伤。虽然性别特异性生物力学涉及女性急性膝关节损伤的风险，而不是男性，但是如果大腿强度的性别差异影响了性别特异性的能量吸收和扭转关节僵硬模式。目的：确定下降期间下肢能量吸收模式和关节刚度的性别差异，并确定这些性别差异是否通过膝盖伸肌和屈肌强度预测。设计：横截面研究。设置：实验室环境。患者或其他参与者：娱乐活动，大学生学生（41名女性：年龄= 22.1 +/- 2.9岁，身高= 1.63 +/- 0.07米，质量= 59.3 +/- 8.0公斤; 40人：年龄= 22.4 + / - 2.8岁，身高= 1.77 +/- 0.1米，质量= 80.9 +/- 14.1千克）。干预：参与者进行了膝关节屈肌和伸肌最大自愿等距收缩，然后是双腿滴跳伞。主要结果测量：下肢关节能量学（J X N（-1）XM（-1））和扭转关节刚度（NM X N（-1）XM（-1）x度（-1））是在初始着陆阶段期间计算臀部，膝关节和脚踝。体重在牛顿和高度以米为单位测量。进行性比较和性别的复发确定大腿肌肉强度（nm / kg）预测矢状平面着陆能量和僵硬。结果：女性膝关节能量69％，臀部扭转僵硬比男性较少36％。在女性中，更大的膝盖延伸强度预测膝关节能量吸收（R（2）= 0.11，P = .04），膝关节屈肌强度较大预测更大的髋部扭转刚度（R（2）= 0.12，p = .03）。结论：跌幅减速阶段的性别特异性生物力学揭示了女性使用战略来试图减少系统僵硬。此外，只有女性强度值才能预测着陆能量和僵硬。这些调查结果集体证明了这项任务可能对女性更加困难，导致具有不同水平的大腿强度水平的运动策略来安全地完成任务。未来的研究人员应该看看观察性差异的其他预测因素。

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