Muscle contributions to support and progression during single-limb stance in crouch gait.
Muscle contributions to support and progression during single-limb stance in crouch gait.
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DOI：
10.1016/j.jbiomech.2010.04.003
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发表时间：
2010-08-10
影响因子：
2.4
通讯作者：
Delp, Scott L.
中科院分区：
文献类型：
--
作者：
Steele, Katherine M.;Seth, Ajay;Hicks, Jennifer L.;Schwartz, Michael S.;Delp, Scott L.
病理性运动模式（如蹲伏步态）的特征在于异常运动学和肌肉激活，这些异常运动学和肌肉激活改变了肌肉在行走期间如何支撑体重。个别肌肉往往是干预的目标，以改善蹲步态，但蹲步态过程中的个别肌肉的作用仍然未知。本研究的目的是检查肌肉如何在单肢站立时对质心加速度和关节角加速度做出贡献，并将这些贡献与未受损步态进行比较。为10名以轻度蹲伏步态行走且先前未接受过手术的儿童创建了特定于受试者的动态模拟。对模拟进行分析，以确定质心的加速度以及由各个肌肉产生的髋关节、膝关节和踝关节的角加速度。这项分析的结果表明，在蹲步态行走的儿童有较少的被动骨骼支持体重，并利用更高的肌肉力量比未受损的个人走。蹲伏步态依赖于与未受损步态相同的肌肉来加速质量中心向上，包括比目鱼肌、股前肌、腓肠肌、臀中肌、股直肌和臀大肌。然而，在蹲下步态这些肌肉是活跃的整个单肢站立，在未受损步态的单肢站立期间看到的肌肉力量的调制相反。与步态正常的受试者相比，以蹲姿行走的受试者更依赖于近端肌肉，包括臀中肌和腿筋，以在单肢站立期间向前加速质心。
Pathological movement patterns like crouch gait are characterized by abnormal kinematics and muscle activations that alter how muscles support the body weight during walking. Individual muscles are often the target of interventions to improve crouch gait, yet the roles of individual muscles during crouch gait remain unknown. The goal of this study was to examine how muscles contribute to mass center accelerations and joint angular accelerations during single-limb stance in crouch gait and compare these contributions to unimpaired gait. Subject-specific dynamic simulations were created for ten children who walked in a mild crouch gait and had no previous surgeries. The simulations were analyzed to determine the acceleration of the mass center and angular accelerations of the hip, knee, and ankle generated by individual muscles. The results of this analysis indicate that children walking in crouch gait have less passive skeletal support of body weight and utilize substantially higher muscle forces to walk than unimpaired individuals. Crouch gait relies on the same muscles as unimpaired gait to accelerate the mass center upward, including the soleus, vasti, gastrocnemius, gluteus medius, rectus femoris, and gluteus maximus. However, during crouch gait these muscles are active throughout single-limb stance, in contrast to the modulation of muscle forces seen during single-limb stance in unimpaired gait. Subjects walking in a crouch gait rely more on proximal muscles, including the gluteus medius and hamstrings, to accelerate the mass center forward during single-limb stance than subjects with unimpaired gait.
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影响因子：
2.4
作者：
Goldberg, SR;Anderson, FC;Delp, SL
通讯作者：
Delp, SL
影响因子：
2.4
作者：
Liu, May Q.;Anderson, Frank C.;Schwartz, Michael H.;Delp, Scott L.
通讯作者：
Delp, Scott L.
DOI：
10.1109/tnsre.2009.2014235
发表时间：
2009-04-01
影响因子：
4.9
作者：
Hunter, Betsy V.;Thelen, Darryl G.;Dhaher, Yasin Y.
通讯作者：
Dhaher, Yasin Y.
影响因子：
2.4
作者：
Stewart, Caroline;Postans, Neil;Roberts, Andrew
通讯作者：
Roberts, Andrew
影响因子：
14.5
作者：
CARR, LJ;HARRISON, LM;STEPHENS, JA
通讯作者：
STEPHENS, JA