Effects of repeated ankle stretching on calf muscle-tendon and ankle biomechanical properties in stroke survivors.
Effects of repeated ankle stretching on calf muscle-tendon and ankle biomechanical properties in stroke survivors.
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DOI：
10.1016/j.clinbiomech.2010.12.003
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发表时间：
2011-06
期刊：
影响因子：
--
通讯作者：
Zhang LQ
中科院分区：
文献类型：
--
作者：
Gao F;Ren Y;Roth EJ;Harvey R;Zhang LQ
本研究的目的是调查小腿肌肉肌腱单位的主动和被动生物力学特性的变化引起的控制踝关节伸展中风幸存者。10例踝关节痉挛/挛缩的脑卒中幸存者和10例健康对照者接受60 min踝关节伸展干预。关节生物力学性能，包括阻力矩，刚度和滞后指数进行了评估前和干预后。使用超声测量跟腱长度。小腿三头肌的力量输出的特点是通过扭矩-角度关系，通过刺激小腿肌肉在不同的踝关节位置的控制强度。与健康对照组相比，中风幸存者对应于峰值扭矩的踝关节位置向跖屈移动（P<0.001）。卒中幸存者表现出显著较高的阻力矩和关节僵硬度（P<0.05），这些较高的阻力在拉伸干预后显著降低，尤其是背屈（P = 0.013）。在匹配刺激下，牵拉可显著改善卒中幸存者受损小腿肌肉的力量输出（P<0.05）。踝关节活动度也增加（P<0.001）。在关节水平，反复拉伸放松踝关节，增加被动关节活动范围和减少关节僵硬。在肌肉-肌腱水平，重复拉伸改善小腿肌肉力量输出，这可能与肌束刚度降低，肌束长度增加和跟腱缩短有关。该研究提供了通过拉伸干预改善肌腱特性的证据。
The objective of this study was to investigate changes in active and passive biomechanical properties of the calf muscle-tendon unit induced by controlled ankle stretching in stroke survivors. Ten stroke survivors with ankle spasticity/contracture and ten healthy control subjects received intervention of 60-min ankle stretching. Joint biomechanical properties including resistance torque, stiffness and index of hysteresis were evaluated pre- and post-intervention. Achilles tendon length was measured using ultrasonography. The force output of the triceps surae muscles was characterized via the torque-angle relationship, by stimulating the calf muscles at a controlled intensity across different ankle positions. Compared to healthy controls, the ankle position corresponding to the peak torque of the stroke survivors was shifted towards plantar flexion (P<0.001). Stroke survivors showed significantly higher resistance torques and joint stiffness (P<0.05), and these higher resistances were reduced significantly after the stretching intervention, especially in dorsiflexion (P = 0.013). Stretching significantly improved the force output of the impaired calf muscles in stroke survivors under matched stimulations (P<0.05). Ankle range of motion was also increased by stretching (P<0.001). At the joint level, repeated stretching loosened the ankle joint with increased passive joint range of motion and decreased joint stiffness. At the muscle-tendon level, repeated stretching improved calf muscle force output, which might be associated with decreased muscle fascicle stiffness, increased fascicle length and shortening of the Achilles tendon. The study provided evidence of improvement in muscle tendon properties through stretching intervention.
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影响因子：
19.7
作者：
Fornage, BD;Atkinson, EN;Jones, PH
通讯作者：
Jones, PH
DOI：
10.1249/01.mss.0000247004.40212.f7
发表时间：
2007-03-01
期刊：
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
影响因子：
--
作者：
Mahieu, Nele Nathalie;McNair, Peter;Witvrouw, Erik
通讯作者：
Witvrouw, Erik
影响因子：
3.2
作者：
Bressel, E;McNair, PJ
通讯作者：
McNair, PJ
影响因子：
2.7
作者：
Roy, RR;Pierotti, DJ;Edgerton, VR
通讯作者：
Edgerton, VR
影响因子：
3.2
作者：
De Deyne, PG
通讯作者：
De Deyne, PG