Effect of number of stimuli and timing of twitch application on variability in interpolated twitch torque.
Effect of number of stimuli and timing of twitch application on variability in interpolated twitch torque.
复制标题
刺激数量和抽搐应用时间对插值抽搐扭矩变异性的影响。
DOI：
10.1152/jappl.2001.90.3.1036
复制
发表时间：
2001
影响因子：
3.3
通讯作者：
Walter Herzog
中科院分区：
文献类型：
--
作者：
E. Suter;Walter Herzog
对自主收缩的肌肉施加超最大电抽搐可用于评估肌肉激活水平。当进行重复刺激时，已观察到内插颤搐扭矩（ITT）的较大变异性。据推测，ITT的这种变异性是由抽搐应用相对于自主兴奋序列的脉冲的定时的随机性质引起的。两个实验进行了12名受试者，以测试这一假设。对于第一个实验，一个单一的抽搐叠加在一个火车刺激在不同的时间间隔相对于火车脉冲。对于第二个实验，在自愿收缩的肌肉上施加单次、双次、三次或四次抽搐。ITT严重依赖于抽搐应用的时间点：在序列脉冲之前5 ms施加的单个脉冲始终诱发比所有其他刺激条件更高的ITT。此外，ITT的变异性随着施加的抽搐次数的增加而降低。结果支持的假设，在ITT的变异性的很大一部分可能是由叠加抽搐相对于运动单位列车的时间。可以通过增加叠加抽搐的数量来减少可变性。
Application of a supramaximal electrical twitch to the voluntarily contracted muscle is used to assess the level of muscle activation. Large variability in the interpolated twitch torque (ITT) has been observed when repeated stimulations are performed. It is hypothesized that this variability in ITT is caused by the stochastic nature of the timing of twitch application relative to pulses of voluntary excitation trains. Two experiments were performed on 12 subjects each to test this hypothesis. For the first experiment, a single twitch was superimposed on a train stimulation at different time intervals relative to the train pulses. For the second experiment, single, double, triple, or quadruple twitches were applied on a voluntarily contracted muscle. The ITT critically depended on the time point of twitch application: a single pulse applied 5 ms before a train pulse consistently evoked higher ITTs than all other stimulation conditions. Furthermore, variability of the ITT decreased as the number of applied twitches increased. The results support the hypothesis that a large part of the variability in the ITT may be caused by the timing of the superimposed twitch relative to the motor unit trains. The variability may be reduced by increasing the number of superimposed twitches.
影响因子：
3.3
作者：
BIGLANDRITCHIE, B;FURBUSH, F;WOODS, JJ
通讯作者：
WOODS, JJ
系列顺应性对叠加在随意收缩上的抽搐的影响。
DOI：
10.1152/jappl.1992.73.2.516
发表时间：
1992
期刊：
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子：
--
作者：
Loring,SH;Hershenson,MB
通讯作者：
Hershenson,MB