Cámara-Calmaestra Rubén, Martínez Kylie J, Calaway Caleb P, Mishra Shaunak, Peaguda Jose, Calzada Ana R, Signorile Joseph F
Department of Health Sciences, Faculty of Health Sciences, University of Jaén, Jaén, Spain.
Graduate Program, Department of Kinesiology and Sports Sciences, University of Miami, Coral Gables, United States.
J Ultrason. 2024 Dec 23;24(99):1-8. doi: 10.15557/jou.2024.0034. eCollection 2024 Dec.
The Nordic hamstring curl appears effective in reducing the incidence of injury in physically active young adults, likely through its capacity as an eccentric exercise to increase muscle stiffness. Although eccentric exercises have been shown to increase muscle stiffness, medium- and long-term Nordic hamstring curl training programs have not demonstrated an effect on muscle stiffness. This study examined the acute effects of a single session of Nordic hamstring curls on the stiffness of the biceps femoris, semitendinosus, and semimembranosus muscles using ultrasound shear wave elastography, an accepted method for measuring passive muscle stiffness.
Twenty physically active adults (ages 19-27 years) were randomly assigned to either the Nordic hamstring curl group ( = 10) or the control group ( = 10). Shear wave elastography was performed on the dominant kicking leg for both groups. The exact location of the probe was marked to ensure the same area was assessed during post-testing. Both groups performed a 5-minute cycle ergometer warm-up followed by three 30-second standing static stretches. The Nordic hamstring curl group then performed three sets of six repetitions of the eccentric phase of the Nordic hamstring curl with 1-minute rest intervals between sets. All subjects then rested for five minutes before shear wave elastography was performed.
Repeated measures ANOVA revealed no significant main effects or interactions for the biceps femoris or semitendinosus ( >0.05). However, analysis of the semimembranosus was inconclusive due to variability of measurement values.
These results are in agreement with findings indicating that long- and short-term Nordic hamstring curl training has no impact on hamstring stiffness, although the effects of Nordic hamstring curl on reducing the probability of hamstring injury are still valid.
北欧腘绳肌弯举似乎能有效降低身体活跃的年轻人的受伤发生率，这可能是因为它作为一种离心运动，能够增加肌肉僵硬度。虽然离心运动已被证明可增加肌肉僵硬度，但中长期的北欧腘绳肌弯举训练计划并未显示出对肌肉僵硬度有影响。本研究使用超声剪切波弹性成像技术（一种测量被动肌肉僵硬度的公认方法），检测了单次北欧腘绳肌弯举对股二头肌、半腱肌和半膜肌僵硬度的急性影响。
20名身体活跃的成年人（年龄19 - 27岁）被随机分为北欧腘绳肌弯举组（n = 10）和对照组（n = 10）。对两组的优势踢腿腿进行剪切波弹性成像检查。标记探头的确切位置，以确保在测试后评估相同区域。两组均进行5分钟的蹬车热身，随后进行三次30秒的站立静态拉伸。然后，北欧腘绳肌弯举组进行三组，每组六次北欧腘绳肌弯举离心阶段的动作，组间休息1分钟。所有受试者随后休息5分钟，然后进行剪切波弹性成像检查。
重复测量方差分析显示，股二头肌或半腱肌没有显著的主效应或交互作用（P>0.05）。然而，由于测量值的变异性，对半膜肌的分析尚无定论。
这些结果与研究结果一致，表明长期和短期的北欧腘绳肌弯举训练对腘绳肌僵硬度没有影响，尽管北欧腘绳肌弯举在降低腘绳肌损伤概率方面的作用仍然有效。
