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Isometric muscle contraction in endocrine myopathies

Department of Clinical Neurophysiology (Dr. Maurer), University of Wurzburg, the Department of Neurology (Dr Hopf), University of Mainz. and the Department of Neurology (Dr. Lowitzsch), City of Ludwigshafen, Federal Republic of Germany.

Isometric contraction of the adductor pollicis muscle of the thumb was evoked by stimulating the ulnar nerve in 20 normal adults and 58 patients with endocrine disorders. We evaluated mechanical latency, electromechanical latency, contraction time, half relaxation time, isometric twitch force, compound muscle action potential, nerve conduction velocity, and relative refractory period. Mechanical characteristics were altered in diseases of the pituitary, thyroid, and parathyroid glands. The close relationship between thyroid hormone and contractile properties discriminated between hypo- and hyperthyroidism.

Address correspondence and reprint requests to Dr. Maurer, Department of Clinical Neurophysiology, Clinic of Nervous Diseases, Bayerische Julius-Maximilians-Universität, Füchsleinstrasse 15, D-8700 Würzburg, Federal Republic of Germany.

Accepted fur publication June 20.1984.