Untersuchungen iiber die Wirkung der Mittelfrequenzstrdme auf den Menschen
Untersuchungen iiber die Wirkung der Mittelfrequenzstrdme auf den Menschen
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DOI：
10.1007/bf01759722
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发表时间：
1944-01-01
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影响因子：
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通讯作者：
Gildemeister, Martin
中科院分区：
文献类型：
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作者：
Gildemeister, Martin
频率从9,000到100,000/秒的正弦电流。在阈值强度下，在闭合电流的瞬间产生皮肤感觉，可以被描述为弱电击。由于使用了大电极，作者基于各种原因假定所观察到的感觉是由皮神经的兴奋引起的，而不是皮肤感觉器官的兴奋引起的。这种电击感觉所需的阈值强度随着频率的增加而增加。在超过阈值强度的电流刺激下，最初的电击感觉之后是一种刺痛感，强度逐渐减弱，但持续数秒。甚至几分钟。这种刺痛感的持续时间取决于频率(低的比高的更有效)和电流的强度。有时，电流中断时会产生电击的感觉，可能是由于组织的整流作用。只有当电流持续至少几毫秒时，才会产生最初的冲击感，这意味着电流发生了100次或更多次的振荡。因此，作者得出结论，在交流电的影响下，神经的兴奋性暂时增加(伪电效应)，而后来神经被抑制。然而，在这种抑制过程中，可以通过增加电流强度或叠加较低频率的电流来兴奋神经。|摘要作者：恩斯特·费舍尔
Sinusoidal currents of frequencies from 9,000 to 100,000/sec. produce, at threshold strength, a skin sensation at the moment of closing the current which can be described as a weak electric shock. Since large electrodes were used, the author assumes for various reasons that the observed sensation is caused by excitation of cutaneous nerves and not by excitation of sense organs in the skin. The threshold strength needed for this shock sensation increases with increase in the frequency. With stimulations by currents above threshold strength, the initial shock sensation is followed by a prickling sensation of diminishing strength but lasting for secs. or even mins. The duration of this prickling sensation depends on the frequency (lower ones more effective than the higher) and on the strength of the currents. Occasionally a shock sensation is caused at the moment the currents are interrupted, probably due to rectification effect of the tissues. The initial shock sensation is produced only when the currents last at least for several millisecs., which means that a hundred or more oscillations of the currents occurred. The author concludes, therefore, that the excitability of the nerves increases temporarily under the influence of an alternating current (pseudo-cateletrotonic effect), while later on the nerves are inhibited. However, during this inhibition, the nerves can be excited by increasing the current strength or by superimposing a current of a lower frequency. || ABSTRACT AUTHORS: Ernst Fischer