The writer has noted this when the vibratode is applied over the exit of the second cervical nerve. If applied to the spinal cord in the interscapular region a decrease in heart rhythm ensues. In relaxations of contractile tissue, in weakness of the heart, in floating kidney, in relaxations of the uterus, in hemorrhoids and prostatic hypertrophy, for the sensations of lassitude of neurasthenic patients - in all these conditions use short but often repeated vibration. The prolonged vibration should be used in neuralgia, hyperaesthesia, spasms, tremor, paralysis agitans, insomnia and all conditions of general excitability. Sometimes the treatment may be given for as long a period as one-half hour.
Some writers prefer to call vibration of low frequency concussion.
Contraction of the myocardium associated with the heart reflex of contraction. It increases pulse volume and diminishes frequency. If the heart is weak and blood-pressure is high, a strengthening of the heart will cause fall of pressure by vibration of 7th cervical spine. Concussion properly applied can cause fall of blood pressure. If the heart is weak and vaso-motors do not compensate the failing heart, a strengthening of the heart causes rise of blood pressure by vibration of 7th cervical spine.