The<unk> <unk>  is a measure of ballistic forces generated by the heart. The downward movement of blood through the descending aorta produces an upward recoil, moving the body upward with each heartbeat. As different parts of the aorta expand and contract, the body continues to move downward and upward in a repeating pattern.<unk>  is a technique for producing a graphical representation of repetitive motions of the human body arising from the sudden ejection of blood into the great vessels with each heart beat. It is a vital sign in the 1–20 Hz frequency range which is caused by the mechanical movement of the heart and can be recorded by noninvasive methods from the surface of the body. It was shown for the first time, after an extensive research work by Dr. Isaac Starr, that the effect of main heart malfunctions can be identified by observing and analyzing the<unk>  signal. Recent work also validates<unk>  could be monitored using camera in a non-contact manner. One example of the use of a<unk>  is a<unk> c scale, which measures the recoil of the persons body who is on the scale. A<unk>  scale is able to show a persons heart rate as well as their weight. The term<unk> originated from the Roman ballista, which is derived from the Greek word ballein (to throw), a machine for launching missiles, plus the Greek words for heart and writing.
Ballistocardiography
Magnetocardiography
Impedance cardiography
Electrocorticography
Phonocardiogram
Electrocochleography
Electrical cardiometry
Tissue Doppler echocardiography