The purpose of this study is to investigate the influence of mechanical vibration upon the blood circulation of the human body. Ten healthy persons were employed as subjects in the experiment. The subjects were laid in a state of the face up position and mechanical vibrations with lower frequency and energy were added for 20 minutes. Dynamics of the blood circulation were measured using an ultrasonograph and a sphygmomanometer before, during, and after the vibration. The results showed that the pulsative index representing resistance to the peripheral circulation significantly increased during the vibration. Mechanical vibration with even lower frequency and energy influenced the peripheral circulation. However, its physiological mechanism has still been unclear.
