Tihanyi Tekla Kornélia, Horváth Mónika, Fazekas Gábor, Hortobágyi Tibor, Tihanyi József
Semmelweis University, and Department of Rehabilitation Medicine, Saint John Hospital Budapest, Hungary.
Clin Rehabil. 2007 Sep;21(9):782-93. doi: 10.1177/0269215507077814.
To determine the effect of whole body vibration on isometric and eccentric torque and electromyography (EMG) variables of knee extensors on the affected side of stroke patients.
A randomized controlled study.
A rehabilitation centre.
Sixteen patients (age 58.2+/-9.4 years) were enrolled in an inpatient rehabilitation programme 27.2+/-10.4 days after a stroke.
Eight patients were randomly assigned to the vibration group and received 20 Hz vibration (5 mm amplitude) while standing on a vibration platform for 1 minute six times in one session. Patients in the control group also stood on the platform but did not receive vibration.
Maximum isometric and eccentric torque, rate of torque development, root-mean-squared EMG, median frequency of vastus lateralis, and co-activation of knee flexors.
Isometric and eccentric knee extension torque increased 36.6% and 22.2%, respectively, after vibration (P<0.05) and 8.4% and 5.3% in the control group. Vibration increased EMG amplitude 44.9% and the median frequency in the vastus lateralis by 13.1% (all P<0.05) without changes in the control group (10.6% and 3.9%). Vibration improved the ability to generate mechanical work during eccentric contraction (17.5%). Vibration reduced biceps femoris co-activation during isometric (8.4%, ns) and eccentric (22.5%, P<0.05) contraction.
These results suggest that one bout of whole body vibration can transiently increase voluntary force and muscle activation of the quadriceps muscle affected by a stroke.
确定全身振动对中风患者患侧膝关节伸肌等长和离心扭矩以及肌电图（EMG）变量的影响。
随机对照研究。
康复中心。
16名患者（年龄58.2±9.4岁）在中风后27.2±10.4天参加了住院康复计划。
8名患者被随机分配到振动组，站在振动平台上接受20赫兹振动（振幅5毫米），每次1分钟，共6次。对照组患者也站在平台上，但不接受振动。
最大等长和离心扭矩、扭矩发展速率、肌电图均方根、股外侧肌中位频率以及膝关节屈肌的共同激活。
振动后，等长和离心膝关节伸展扭矩分别增加了36.6%和22.2%（P<0.05），而对照组分别增加了8.4%和5.3%。振动使肌电图振幅增加了44.9%，股外侧肌中位频率增加了13.1%（均P<0.05），而对照组无变化（分别为10.6%和3.9%）。振动提高了离心收缩过程中产生机械功的能力（17.5%）。振动降低了等长收缩（8.4%，无统计学意义）和离心收缩（22.5%，P<0.05）期间股二头肌的共同激活。
这些结果表明，一次全身振动可短暂增加中风患者患侧股四头肌的随意力量和肌肉激活。
