Pulse Energy as a Reliable Reference for Twitch Forces Induced by Transcutaneous Neuromuscular Electrical Stimulation
Pulse Energy as a Reliable Reference for Twitch Forces Induced by Transcutaneous Neuromuscular Electrical Stimulation
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DOI：
10.1109/tnsre.2012.2188305
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发表时间：
2012-07-01
影响因子：
4.9
通讯作者：
Lai, Jin-Shin
中科院分区：
文献类型：
--
作者：
Chen, Chiun-Fan;Chen, Wen-Shiang;Lai, Jin-Shin
电压控制的神经肌肉电刺激被认为在非侵入性应用中更安全，尽管事实上电压控制的设备据称产生的力比其电流控制的等效物更不可预测。这促使我们评估相关的电参数，以确定电压控制刺激诱导的力是否能够与电流控制刺激诱导的力相匹配，电流控制刺激往往会引起更可预测的力。对应于电流和电压控制的刺激的力大小相对于相同刺激脉冲的电荷（相当于平均电流强度）和电能（相当于平均功率）对齐，以确定哪一个提供更好的相干性。用能量评估的力的一致性显著（p < 0.001）好于用电荷评估的力的一致性，这表明可以通过监测刺激脉冲的能量参数来可靠地预测电刺激力。上述结果似乎表明，电极-组织阻抗，一个使电荷和能量评估不同的因素，重新定义了电流强度在产生有利结果方面的实际影响。因此，跟踪刺激脉冲的能量（或平均功率）的新颖方案可以用作可靠的基准，以在电刺激的经皮应用中关联机械（力）和电（刺激脉冲）特性。
Voltage-controlled neuromuscular electrical stimulation has been considered to be safer in noninvasive applications notwithstanding the fact that voltage-controlled devices purportedly generate forces less predictable than their current-controlled equivalents. This prompted us to evaluate relevant electrical parameters to determine whether forces induced by voltage-controlled stimuli were able to match to those induced by current-controlled ones, which tend to evoke forces that were more predictable. Force magnitudes corresponding to current-and voltage-controlled stimuli were aligned with respect to electric charge (equivalent to average current intensity) and electrical energy (equivalent to average power) of the same stimulation pulse to determine which provided a better coherence. Consistency of forces evaluated with energy was significantly (p < 0.001) better than that evaluated with electric charges, suggesting that electrically stimulated forces can be reliably predicted by monitoring the energy parameter of stimulation pulses. The above results appear to show that electrode-tissue impedance, a factor that makes charge and energy evaluations different, redefined the actual effects of current intensities in generating favorable results. Accordingly, novel schemes that track the energy (or average power) of a stimulation pulse may be used as a reliable benchmark to associate mechanical (force) and electrical (stimulation pulse) characteristics in transcutaneous applications of electrical stimulation.