Neurophysiological studies

A study using surface-EMG showed a hyperactivity of the paravertebral muscles compared to controls. The necessary use of the functional reserve of these muscles while standing was interpreted as weakness. In an additional study we directly examine force recordings of the trunk muscles. Furthermore we include leg and hip muscles to receive a systematic understanding of the interacting muscle system. These data might also help to understand MRI muscle findings and to differentiate dystonic from myopathic mechanisms.