A Simple Method to Determine the Reflex Latency During Whole Body Vibration
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 5
- 试验地点
- 2
- 主要终点
- Latency measurement method
研究概览
简要总结
The purpose of this study was to examine the validity of the measurement method based on observation of vibration stimulation-MUAP (motor unit action potential) (1 to 1) matching that helps to measure human WBV-induced muscular reflex latency and to compare these results with the latency determination obtained using the classical methods. The investigators' principle hypothesis is that the simple method is capable of determining the WBV induced reflex response latency as reliably as the complex methods described earlier.
To achieve this goal, the investigators have averaged the electrical responses of the soleus muscle (sEMG and multi motor unit (MMU) potential) against the vertical force data obtained during all the six vibration frequencies tested in this study. The investigators have then combined all the averaged EMG data belonging to six different vibration frequencies to generate the 'cumulative averaged' sEMG and MMU for each subject. The investigators have also obtained the standard error for the cumulative averaged records which indicated the WBV-induced muscular reflex (WBV-IMR) latency.
详细描述
Subjects Five healthy volunteers will be participated in the study.
Procedures During WBV, the subjects will be asked to stand upright on a vibration platform (PowerPlate Pro5, London, United Kingdom). Their hips and knees will be in a neutral position. Subjects will be barefooted, and no sponge or foam will be placed between the vibration platform and their feet (Figure 1). The whole plate oscillates with a linear movement upward and downward. Vibration amplitude is 2.2 mm. WBV frequencies will be varied randomly to cover the following six frequencies: 25, 30, 35, 40,45 and 50 Hz. Each frequency lasts for 60 seconds and there will be a 15 seconds rest in between different frequencies.
A load sensor (FC2331-0000-2000L Compression Load Sensor, France) will be fixed on the WBV platform in order to be able to determine induced muscular response latency. Subjects will be positioned on the WBV platform such that their right heel will be placed on the load sensor.
Recordings MMUs, surface EMG (sEMG) and force recordings will be simultaneously done using the Powerlab data acquisition system (ADInstruments, Oxford, United Kingdom). A sampling frequency of 40 kiloHertz (kHz) will be used. Data will be analyzed offline using the MATLAB (R2012a 7.14.0.739).
In order to record sEMG, Ag/AgCl electrodes [KENDALL ® Arbo] with a disc radius of 10 mm will be placed 20 mm apart on the right soleus muscle belly, on shaved skin cleaned with alcohol. The ground electrode will be placed on the lateral malleolus.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Basic Science
- 盲法
- None
入排标准
- 年龄范围
- 20 Years 至 45 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Young adult (20-45 yrs)
- •Right handed
排除标准
- •Any health problems
- •Left handed
研究组 & 干预措施
Whole-body vibration
A new method for muscle reflex latency measurement
干预措施: whole-body vibration (Other)
结局指标
主要结局
Latency measurement method
时间窗: 1 day
次要结局
未报告次要终点