Coordination dynamics in Parkinson's disease patients and healthy subjects quantified by the coordination dynamics recording method and sEMG.

Coordination dynamics were measured in Parkinson's disease patients to quantify central nervous system (CNS) dysfunction. The low-load coordination dynamics in the patients were impaired by 56% for forward and 44% for backward moving in comparison to a control group of similar age. Exercising at higher load was only partly possible. When the disease preferentially affected one side of the body, the coordination dynamics were worse for the affected side. A dexterity test showed that coordination of hand and arm movements could be improved in the short-term memory when exercising on the special coordination dynamics recording and therapy device. Simultaneously taken surface EMG (sEMG) showed that the motor pattern was impaired in the Parkinson's disease patients. sEMG recordings showed further that the fast fatigable muscle fibre activation was impaired. FF-type muscle fibres were already activated for low load in one and not at all in another muscle. In conclusion, coordination between motoneuron firings and between arm and leg movements were found to be impaired in Parkinson's disease patients.