Kohnstamm phenomenon

af·ter·move·ment

(af'ter-mūv'ment),
Involuntary arm abduction that follows sustained isometric contraction of the deltoid and supraspinatus muscles (usually performed by pushing the upper extremity forcibly and against an immovable vertical surface while standing beside it).

Kohnstamm phenomenon

(kon'stom?)
[Oscar Kohnstamm, Ger. physician, 1871–1917]
Aftermovement.

Kohnstamm,

Oskar, German physician, 1871-1917.
Kohnstamm phenomenon - a slow, involuntary elevation of the arm after strong pressure against a firm object. Synonym(s): after-movement