Surface Electromyography Instrumentation

Surface electrodes summate the electrical action potentials from the contracting muscle and establish electrical pathways from skin contact of the monitored muscle site (Figure 12-1.1). The sEMG instrument receives and processes this electrical correlate of a muscle activity measured in microvolts (||V) (Figure 12-1.2). Intracavitary or surface sensors may detect one or two channels of sEMG activity. The two-channel multiple electrode probe (MEP) anal sEMG sensor (Figure 12-1.3) allows discrimination between proximal and distal external anal sphincter activity, thereby allowing the clinician to target specific areas of external anal sphincter inactivity in the rehabilitation process.

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