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NEUROLOGY 2004;62:632-634
© 2004 American Academy of Neurology
Brief Communications

Is the spinal cord the generator of 16-Hz orthostatic tremor?

Jonathan A. Norton, PhD, Duncan E. Wood, PhD and Brian L. Day, DPhil

From the MRC Human Movement Group (Drs. Norton and Day), Sobell Research Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, London, UK; and Department of Medical Physics and Biomedical Engineering (Dr. Wood), Salisbury District Hospital, Wilts, UK.

Address correspondence and reprint requests to Dr. Brian Day, Sobell Research Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, UCL, 8-11 Queen Square, London, WC1N 3BG, UK; e-mail: b.day{at}ion.ucl.ac.uk

Primary orthostatic tremor is characterized by 16-Hz motor activity that is coherent between muscles. It has been suggested that this tremor originates in the brain. This view is questioned by findings from a patient with complete paraplegia who experiences intermittent leg spasms at rest. The EMG activity within the spasms showed a 16-Hz component that was coherent between muscles unilaterally and bilaterally. This raises the possibility that the spinal cord could be the source of orthostatic tremor.

Received June 10, 2003. Accepted in final form September 18, 2003.

The current address for Dr. Norton is Rehabilitation Neuroscience, Department of Biomedical Engineering, Centre for Neuroscience, University of Alberta, Edmonton, Alberta, Canada.




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