Biomaterial Database

[Double discharges of motor units and tremor strength]. 1988

R Dengler, and J Elek, and R Hermans, and W Wolf

Neurologische Klinik, Technische Universität München.

The relationship between the double-discharges (DDs) of single motor units (MUs) and the tremor strength was studied in 7 patients with parkinsonism and 3 with essential tremor. The potentials of single MUs and the force of the first dorsal interosseus muscle were recorded during slight isometric contractions. The rate of DDs and their interval duration were correlated with the global tremor strength and the amplitudes of the single tremor beats. With increasing tremor strength, the rate of DDs increased and the duration of their intervals decreased. It is concluded that DDs act as tremor amplifiers. This effect is probably accounted for by a more than linear summation of two consecutive MU contractions with short interval which is known from animal experiments.

UI	MeSH Term	Description	Entries
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D009046	Motor Neurons	Neurons which activate MUSCLE CELLS.	Neurons, Motor,Alpha Motorneurons,Motoneurons,Motor Neurons, Alpha,Neurons, Alpha Motor,Alpha Motor Neuron,Alpha Motor Neurons,Alpha Motorneuron,Motoneuron,Motor Neuron,Motor Neuron, Alpha,Motorneuron, Alpha,Motorneurons, Alpha,Neuron, Alpha Motor,Neuron, Motor
D009119	Muscle Contraction	A process leading to shortening and/or development of tension in muscle tissue. Muscle contraction occurs by a sliding filament mechanism whereby actin filaments slide inward among the myosin filaments.	Inotropism,Muscular Contraction,Contraction, Muscle,Contraction, Muscular,Contractions, Muscle,Contractions, Muscular,Inotropisms,Muscle Contractions,Muscular Contractions
D010300	Parkinson Disease	A progressive, degenerative neurologic disease characterized by a TREMOR that is maximal at rest, retropulsion (i.e. a tendency to fall backwards), rigidity, stooped posture, slowness of voluntary movements, and a masklike facial expression. Pathologic features include loss of melanin containing neurons in the substantia nigra and other pigmented nuclei of the brainstem. LEWY BODIES are present in the substantia nigra and locus coeruleus but may also be found in a related condition (LEWY BODY DISEASE, DIFFUSE) characterized by dementia in combination with varying degrees of parkinsonism. (Adams et al., Principles of Neurology, 6th ed, p1059, pp1067-75)	Idiopathic Parkinson Disease,Lewy Body Parkinson Disease,Paralysis Agitans,Primary Parkinsonism,Idiopathic Parkinson's Disease,Lewy Body Parkinson's Disease,Parkinson Disease, Idiopathic,Parkinson's Disease,Parkinson's Disease, Idiopathic,Parkinson's Disease, Lewy Body,Parkinsonism, Primary
D006225	Hand	The distal part of the arm beyond the wrist in humans and primates, that includes the palm, fingers, and thumb.	Hands
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328	Adult	A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available.	Adults
D000368	Aged	A person 65 years of age or older. For a person older than 79 years, AGED, 80 AND OVER is available.	Elderly
D014202	Tremor	Cyclical movement of a body part that can represent either a physiologic process or a manifestation of disease. Intention or action tremor, a common manifestation of CEREBELLAR DISEASES, is aggravated by movement. In contrast, resting tremor is maximal when there is no attempt at voluntary movement, and occurs as a relatively frequent manifestation of PARKINSON DISEASE.	Action Tremor,Intention Tremor,Resting Tremor,Coarse Tremor,Continuous Tremor,Darkness Tremor,Fine Tremor,Intermittent Tremor,Involuntary Quiver,Massive Tremor,Passive Tremor,Persistent Tremor,Pill Rolling Tremor,Rest Tremor,Saturnine Tremor,Senile Tremor,Static Tremor,Tremor, Limb,Tremor, Muscle,Tremor, Neonatal,Tremor, Nerve,Tremor, Perioral,Tremor, Semirhythmic,Action Tremors,Coarse Tremors,Continuous Tremors,Darkness Tremors,Fine Tremors,Intention Tremors,Intermittent Tremors,Involuntary Quivers,Limb Tremor,Limb Tremors,Massive Tremors,Muscle Tremor,Muscle Tremors,Neonatal Tremor,Neonatal Tremors,Nerve Tremor,Nerve Tremors,Passive Tremors,Perioral Tremor,Perioral Tremors,Persistent Tremors,Pill Rolling Tremors,Quiver, Involuntary,Rest Tremors,Resting Tremors,Saturnine Tremors,Semirhythmic Tremor,Semirhythmic Tremors,Senile Tremors,Static Tremors,Tremor, Action,Tremor, Coarse,Tremor, Continuous,Tremor, Darkness,Tremor, Fine,Tremor, Intention,Tremor, Intermittent,Tremor, Massive,Tremor, Passive,Tremor, Persistent,Tremor, Pill Rolling,Tremor, Rest,Tremor, Resting,Tremor, Saturnine,Tremor, Senile,Tremor, Static,Tremors