Electromyography
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Electromyography
Electromyography is used to record muscle fiber action potentials. In addition to needle myography, which is primarily used in clinical examinations, surface myography has proven itself for movement science questions. In most cases, voltage changes (in the mV range) are derived from the skin surface located above the muscle using two bipolar active electrodes (which are attached to the skin at a small distance above the muscle belly) and a reference electrode with the aid of amplifier systems. The exact anatomical locations for bonding the active electrodes are described in the technical literature.
For the most interference-free measurement, the skin surface should be thoroughly cleaned and a contact gel applied between the skin and the electrode body. Electromyography allows quantitative conclusions to be drawn about the duration, increase, level and characteristics of muscle activation.
Our electromyography consists of an 8-channel electro-optical isolation amplifier (Elisa 8.2) which is connected via an A/D converter card from National Instruments (NI Multi I/O PCI 6024 E) to an evaluation program geared towards movement science questions. For a brief introduction to surface myography, please refer to the summary by deLuca (2002).