Table 2.

The absorption of ultrasound energy produces the following effects [15].

Effects	Mechanism
Vasodilation	Release of tissue stimulants. Reduction in muscle tone.
Muscle relaxation	Elimination of tissue stimulants. Post-excitatory depression orthosympathetic.
Increased membrane permeability	Forcing the tissue fluid through. pH less acidic.
Increased tissue regeneration	Mechanical effect.
Thermal effect	Can block conduction. Nervous tissue possesses special sensitivity to ultrasound.
Decrease in pain	Normalization of muscle tone. Decrease in pH.