What is meant by deep oscillation? Manual lymphatic drainage shifts fluids in the tissue as part of a complex decongestion therapy. These effects are mitigated by Deep Oscillation Therapy (DOT). An electromechanical therapy method with targeted resonance vibrations of the tissue is improved. The vibration and pumping effect caused by mechanical oscillations, which extend deep into the fascia, positively influence the lymphatic flow. This form of oedema treatment is particularly effective for fibrotic altered tissue, providing reassurance about its applicability in such cases.