Fig. 5

Schematic diagram of the Wavelet Spectra of the MMG/MTG-signals. The Wavelet spectra of the MMG resp. MTG of the triceps brachii muscle and its tendon (top left/right) as well as of the abdominal external oblique muscle (bottom left) during isometric muscle action at 80% of the MVC show the stochastically distributed oscillations in the low frequency area around approximately 15 Hz. The right scale displays the intensity of power. The left side of each figure displays the mean of the power over the time. This can be seen analogues to the Power Spectral Density (PSD)