Wrist tremor: investigation of agonist-antagonist interaction by means of long-term EMG recording and cross-spectral analysis

Boose, A.; Spieker, Sybille; C, Jentgens; Dichgans, J.

doi:10.1016/0924-980x(96)95533-2

Cited by 39 publications

(35 citation statements)

References 15 publications

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“…Statistically significant coherence between two muscle burst discharge signals was determined as 0.25 or greater. A similar methodology as described by Boose and coworkers 17 was used to interpret EMG phase relationships. An EMG phase difference of Ϫ45°to 45°was defined as co-contraction and a phase difference of 135°to 225°w as considered as alternating contraction.…”

Section: Methodsmentioning

confidence: 99%

Clinical and neurophysiologic spectrum of orthostatic tremor: Case series of 26 subjects

Piboolnurak

Pullman

2005

Movement Disorders

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Orthostatic tremor (OT) is a condition described as high-frequency tremors predominantly in the legs and trunk, which are present not only in the standing position but also during isometric contraction of the limb muscles. This report is one of the largest OT series describing clinical and neurophysiologic findings in 26 subjects with OT. The main findings included 13.0 to 18.6 Hz leg tremors while standing with varied patterns of phase relationships between the antagonists of the ipsilateral leg and between the homologous muscles of the contralateral leg, short latency tremor onset upon standing with abrupt cessation after sitting, coexistence of tremors in the cranial structures and the arms, and sense of unsteadiness without actual falls. Although the oscillator of OT is most likely located in the brainstem, cerebral cortex, basal ganglia, and cerebellum may also be involved in its pathogenesis.

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Section: Methodsmentioning

confidence: 99%

Clinical and neurophysiologic spectrum of orthostatic tremor: Case series of 26 subjects

Piboolnurak

Pullman

2005

Movement Disorders

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“…In addition, there exist many controversies as to whether a primary writing tremor is a variant of an essential tremor or a variant of writer's cramp (14). Furthermore, the co-contraction pattern of agonist and antagonist muscle cannot always classify a type of tremor and differentiate tremor from dystonia because variable patterns of contraction were observed in the long-term EMG recording in patients with essential tremor (15). In this regard, the response to alcohol in the present patient may suggest the possibility that this patient may have suffered from a co-existing writing tremor, although the EMG findings of this patient did not correspond to a primary writing tremor.…”

Section: Discussionmentioning

confidence: 99%

Alcohol-Responsive Writer's Cramp

Lim

Kim

et al. 2012

Intern. Med.

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Writer's cramp is a rare movement disorder of unknown etiology, in which a cramp is elicited primarily or exclusively with writing. We describe a patient with primary writer's cramp that was completely improved by drinking a small amount of alcohol. Although it is unclear how "alcohol" ameliorated the dystonia, this case suggests that alcohol might reverse the pathophysiologic changes in the entire basal ganglia circuit. In addition, we cannot rule out the possibility that the anxiolytic influence of alcohol may contribute to the beneficial effects on dystonia.

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“…The tremor frequency or amplitude are only poor criteria for separating PD tremor from other tremors [35]. The pattern of activation in antagonistic muscles is mostly reciprocal alternating but this is not a reliable discriminator between PD and other tremors [17,134,135]. Methods of non-linear time series analysis have been proposed to provide a more reliable tool to separate PD at least from essential tremor [36, 143] but when the same methods were applied prospectively in a larger series of patients, this distinction became much less clear [144].…”

Section: Physiological and Pathophysiological Features Of Parkinsoniamentioning

confidence: 99%

“…Up to now, most studies have focused on the coherence between brain and muscle activity in voluntary movements of normal subjects [7,8,23,52,111,112]. These studies have demonstrated that some types of muscle activity are reflected in the coherence pattern at different frequency bands (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) and that at least the lower frequency activity seems to reflect pyramidal tract cell activity [7]. Abnormal muscle activity has only rarely been studied.…”

Section: Studies On the Coherence Between Brain And Muscle Activitymentioning

confidence: 99%

The pathophysiology of parkinsonian tremor: a review

Deuschl¹,

Raethjen²,

Baron³

et al. 2000

J Neurol

219

177

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Parkinsonian tremor is most likely due to oscillating neuronal activity within the CNS. Summarizing all the available evidence, peripheral factors only play a minor role in the generation, maintenance and modulation of PD tremor. Recent studies have shown that not a single but multiple oscillators are responsible. The most likely candidate producing these oscillations is the basal ganglia loop and its topographic organization might be responsible for the separation into different oscillators which, nevertheless, usually produce the same frequency. The neuronal mechanisms underlying these oscillations are not yet clear, but three hypotheses would be compatible with the presently available data from animal models and data recorded in patients. The first is a cortico-subthalamo-pallido-thalamic loop, the second is a pacemaker consisting of the external pallidum and the subthalamic nucleus, and the third is abnormal synchronization due to unknown mechanisms within the whole striato-pallido-thalamic pathway leading to a loss of segregation. Assuming the oscillator within the basal ganglia pathway, the mechanism of stereotactic surgery might be a desynchronization of the activity of the basal ganglia-thalamo-cortical or the cerebello-thalamo-cortical pathway.

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Wrist tremor: investigation of agonist-antagonist interaction by means of long-term EMG recording and cross-spectral analysis

Cited by 39 publications

References 15 publications

Clinical and neurophysiologic spectrum of orthostatic tremor: Case series of 26 subjects

Clinical and neurophysiologic spectrum of orthostatic tremor: Case series of 26 subjects

Alcohol-Responsive Writer's Cramp

The pathophysiology of parkinsonian tremor: a review

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