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首页> 外文期刊>Journal of electromyography and kinesiology: Official journal of the International Society of Electrophysiological Kinesiology >Effects of repeated Achilles tendon vibration on triceps surae stiffness and reflex excitability
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Effects of repeated Achilles tendon vibration on triceps surae stiffness and reflex excitability

机译：跟腱反复振动对肱三头肌腓肠肌僵硬和反射兴奋性的影响

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摘要

Clinical studies frequently report an increase in stiffness and a loss of range of motion at joints placed in disuse or immobilization. This is notably the case for subjects maintained in bed for a long period, whilst their joints are not affected. Recently we documented on healthy subjects the benefit in terms of force and activation capacities of the triceps surae offered by vibrations applied to the Achilles tendon. Knowing that stiffness changes may contribute to force changes, the aim of the present study was to investigate the effects of tendon vibration on the triceps surae stiffness of healthy subjects. The vibration program consisted in 14. days of 1. h daily Achilles tendon vibration applied at rest. Nineteen healthy students were involved in this study. Before and at the end of the vibration program, musculo-tendinous stiffness in active conditions was determined by use of a quick-release test. Passive stiffness was also analyzed by a flexibility test: passive torque-angle relationships were established from maximal plantar-flexion to maximal dorsiflexion. Passive stiffness indexes at 10°, 15° and 20° dorsiflexion were defined as the slope of the relationships at the corresponding angle. Tendinous reflex, influenced by stiffness values, was also investigated as well as the H reflex to obtain an index of the central reflex excitability. After the program, musculo-tendinous stiffness was significantly decreased (p=01). At the same time, maximal passive dorsiflexion was increased (p=005) and passive stiffness indexes at 10°, 15° and 20° dorsiflexion decreased (P<001; P<001 and p=011, respectively). Tendinous reflex also significantly decreased. As the triceps surae parameters are diminished after the vibration program, it could be beneficial to immobilized persons as hypo-activity is known to increase muscular stiffness.
机译：临床研究经常报告，在停用或固定时，关节的僵硬度增加且运动范围丧失。对于长时间躺在床上而受试者的关节没有受到影响的受试者来说，情况尤其如此。最近，我们在健康受试者上记录了通过施加于跟腱的振动而产生的肱三头肌肱三头肌力量和激活能力方面的益处。知道刚度的变化可能会导致力的变化，本研究的目的是研究肌腱振动对健康受试者肱三头肌硬膜僵硬度的影响。振动程序包括在每天休息1.h的14.天中使用跟腱振动。 19名健康的学生参与了这项研究。在振动程序之前和结束时，通过使用快速释放测试来确定活跃状态下的肌肉腱刚度。还通过柔韧性测试分析了被动刚度：从最大足底屈曲到最大背屈建立了被动扭矩-角度关系。将在10°，15°和20°背屈时的被动刚度指数定义为在相应角度下的关系斜率。还研究了受刚度值影响的腱反射以及H反射，以获得中央反射兴奋性的指标。程序执行后，肌腱刚度明显降低（p = 01）。同时，最大被动背屈增加（p = 005），而在10°，15°和20°背屈时的被动刚度指数降低（分别为P <001; P <001和p = 011）。腱反射也明显降低。由于在进行振动程序后肱三头肌的肱三头肌参数会降低，因此对身体固定的人可能会有所帮助，因为已知运动量过少会增加肌肉僵硬。

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