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Edmund Jacobson

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Edmund Jacobson (b. April 22, 1888 in Chicago; d. January 1983 in Chicago) was a US-American physician in internal medicine and psychiatry and a physiologist. He was the founder of the Progressive Muscle Relaxation and of Biofeedback.

He was the son of Morris Jacobson, a realtor in Chicago, born in Strasbourg, and his wife Fannie, born in Iowa.

After a B.S. degree from Northwestern University in 1908, Jacobson received M.A. and Ph.D. degrees from Harvard University and then returned to Chicago as an assistant in physiology. Here he obtained his M.D. degree in 1915.

He began his physiological investigations at Harvard University in 1908. In 1921, he introduced the application of psychological principles to medical practice which was later called psychosomatic medicine. Employing low microvoltage apparatus, Jacobson also made the first accurate electrical measurement of muscular tonus, nerve impulses and mental activities in neuromuscular sites in living men.

Jacobson was able to prove the connexion between excessive muscular tension and different disorders of body and psyche. He found out that tension and exertion was always accompanied by a shortening of the muscular fibres, that the reduction of the muscular tonus decreased the activity of the central nervous system, that relaxation was the contrary of states of excitement and well suited for a general remedy and prophylaxis against psychosomatic disorders.

In 1929, after twenty years of research, Jacobson began to publish his results in the book "Progressive Relaxation" (Univ. of Chicago Press). His major work, "You must relax", addressing the general public, came out in 1934.

Jacobson deepened his investigations from 1936 through 1960 at the Laboratory for Clinical Physiology in Chicago which he directed, and he continued his investigations of simultaneous chemical and electronic recordings in man in health until the 1970s.

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