By Speakman J

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Not only is the amplitude accurately controllable, but also the frequency. Another alterable parameter is the use of 'interrupted' waves (recurring periods of absence of impulses) which is supposed to stop adaptation to the stimulus. Yet another variation is 'modulation' when there is one main frequency, modulated by a higher frequency wave, perhaps at specific intervals. There is not yet enough known to be able to comment on these variants, so we will stick to the straight forward principles. Each output from the machine ends in two electrodes - one black coloured (negative), the other red (positive).

However, a slightly easier fonn of pulse diagnosis, called 'pulse generalization' , is also used. This is still difficult for us to comprehend and elicit, but, like tongue diagnosis, it may be worthy of practice. A Xu pulse is described as weak or thready and disappears on heavy pressure. By definition, this is seen in chronic diseases of Yin-Yang deficiency and' often indicates splenic dysfunction. A Shi pulse is the opposite, forceful, and obviously seen in Shi diseases. A 'bowstring' pulse is harder and more forceful but more flexible like a bowstring and can indicate liver dysfunction.

We need to know two things after choosing and locating the point: firstly the size of the needle to use, and secondly the direction of insertion. Ashi in conditions such as tennis elbow and subacromial bursitis will be familiar enough to us in conventional medicine. One should end up in the same place as when giving a steroid injection. In the above two examples, putting a one inch needle in, either obliquely or perpendicular to the skin surface, to arrive at the right point would be correct. The production of deqi would furthennore confinn the proper location.

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An introduction to the electronic theory of valency by Speakman J

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