Biomedical Engineering Reference
In-Depth Information
FIGURE 4.47:
Types of EMG electrodes. a) Single wire electrode, b) needle elec-
trode.
FIGURE 4.48:
Surface electrodes array. From [Nawab et al., 2010].
tion of all its muscle fibers, preceded by their depolarization, which is detected as
a waveform called motor unit action potential (MUAP). The spike component of
MUAP (and its peak-to-peak amplitude) is determined by a few fibers closest to the
electrode; the more remote fibers influence mainly MUAP duration. MUAP shape de-
pends also on the temporal dispersion between single fiber potentials. The temporal
dispersion is determined mainly by the distribution of motor endplates along muscle
fibers, resulting in the differences in arrival times to the electrode. The shapes of con-
Search WWH ::
Custom Search