Abstract des Autors

The present study was meant to describe functional states of the central nervous system by monitoring 17-channel EEG signals directly during motor activity. Eight junior cyclists and eight control subjects rode on a special treadmill for cycling exercise. Two pedalling rates were combined with two physical loads. EEG signals were recorded continuously during rides and rests. Optical data transformation, computer aided signal processing with artifact reduction, and online mapping allowed measurements of sufficient quality. The most important results are: 1. The center alpha frequency, referring to sensorimotor areas of the cortex, increased after cycling workload. 2. Contrary to that, central and parietal center alpha frequencies decreased during cycling. 3. The cyclists' data showed smaller correlations than the control subjects'. Arousal theories of one activation level cannot explain the results satisfactorily. Hence a posssible interaction of general and functional kinds of activation is discussed. Verf.-Referat