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首页> 外文会议>Iranian Conference on Biomedical Engineering >Investigating the role of foot placement on the muscular forces of knee extensors in horizontal leg press: A static optimization approach
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Investigating the role of foot placement on the muscular forces of knee extensors in horizontal leg press: A static optimization approach

机译：调查脚放置对水平腿部膝关节延伸部肌肉力的作用：静态优化方法

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Horizontal leg press is a basic weight training exercise to strengthen extensor muscles of knee joint. Considering the specific purpose of this training, it's performed with different techniques. One of the major debates about performing this task concerns foot placement on the foot-plate. In this study, in order to investigate the effect of foot placement on the muscle contraction of knee extensors, a 3-DOF musculoskeletal model of lower-extremity was developed. This model was comprised of 40 skeletal muscles of lower-extremity. Each muscle was modeled with a phenomenological Hill-based model in accompanied with a rigid tendon. Considering the position of feet on the foot-plate (high or low), two types of experiments were designed: Leg Press High (LPH) and Leg Press Low (LPL). 6 healthy volunteers (2 women and 4 men) participated in this study. Experiments were performed at 30% and 70% of each person's MVC (the maximum weight in which a person could perform the exercise correctly) on the LPL and LPH protocols. Amalgamating the mean values of kinematic data and a constrained static optimization (sum of squared activations as the objective function and discritisized state equations of the multibody system as constraints), the required activation level of each muscle was obtained. The results showed a significant difference between the obtained muscle forces for knee extensors (vastus intermedius, vastus lateralis, vastus medialis, and rectus femoris) in each technique (p<0.05). The muscle forces obtained in LPH technique were significantly smaller from the same ones in LPL. This observation suggests that if strengthening the knee extensors is of desire, LPH technique is not the correct format for performing the exercise. Another important spotlight in the results concerned the activation patterns of knee extensors. Despite the synergic behavior of all the extensors, because of the different operating range of these muscles, dissimilarity between activation pat- erns was observed.
机译：卧式压腿是一个基本的重量训练，加强膝关节的伸肌。考虑到这培训的具体目的，它是用不同的技术来进行。一个关于执行这项任务的主要争议涉及对脚足板放置。在这项研究中，为了探讨膝伸肌的肌肉收缩脚放置的效果，一个3-DOF肌骨模型下肢的开发。这个模型是由下肢的40和骨骼肌。每块肌肉与在刚性肌腱伴随一个现象基于希尔模型建模。考虑到脚放在脚踏板（高或低）的位置，两种类型的实验设计：蹬腿高（LPH）和蹬腿低（LPL）。 6名健康志愿者（2名妇女和4名男子）参加了这项研究。实验是在对LPL和LPH协议，30％和每个人的MVC的70％（其中一个人可以正确地执行演习的最大重量）进行。同化的运动学数据的平均值和约束静态优化（平方激活的总和作为目标函数和多体系统作为约束discritisized状态方程），获得每块肌肉的需要活化水平。结果表明：对于膝伸肌的肌肉得到力之间的差异显著（股中间，股外侧肌，股内侧肌，和股直肌）在各技术（P <0.05）。在LPH技术获得的肌肉力量是来自于LPL同那些显著小。这一观察表明，如果加强膝伸肌是渴望的，LPH技术不进行锻炼的正确格式。在结果的另一个重要焦点关注膝伸肌的激活模式。尽管所有的伸肌，因为这些肌肉的不同的工作范围，差异性观察之间激活PAT- ERNS的，的协同行为。

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