RT Journal Article
SR Electronic
T1 Hand cramps
JF Neurology
JO Neurology
FD Lippincott Williams & Wilkins
SP 1005
OP 1005
DO 10.1212/WNL.38.7.1005
VO 38
IS 7
A1 Leonardo G. Cohen
A1 Mark Hallett
YR 1988
UL http://n.neurology.org/content/38/7/1005.abstract
AB We studied 19 patients with hand cramps, including writer's cramp, typist's cramp, piano, and guitar player's cramp. EMGs were recorded while patients performed the task triggering the cramps. Ten patients with dystonic cramps had EMGs with generalized muscle spasms with co-contraction of agonist and antagonist muscles. In three patients with simple cramps that involved one to three fingers, specific muscle groups showed co-contracting bursts that lasted longer than normal. The physiological abnormalities support the interpretation that hand cramp is a focal dystonia, characterized by both excessive muscle activity and defective fine motor control.