Acute Effects of Handheld Vibration Massage on Posterior Shoulder Soft Tissues Published in International Journal of Sports Physical Therapy What Is Vibration Therapy? Soundproof Cow What is principle behind sound vibration massage? Sound Vibration massage chair Tend uses Direct Vibration Therapy, sometimes known as Focal Vibration therapy. , Tend has a unique pin point tip to access hard to reach parts of the body. , Focal Vibration Therapy (FVT) is a type