[Normal aging and Parkinson's disease: deciphering the neurophysiological changes affecting gait].

With age, walking can be impaired, with a high risk of falls. This risk is even greater with Parkinson's disease. This research highlights the fact that, during walking, the need for cognitive resources increases with age and with Parkinson's disease. It also demonstrates that after an intensive exercise program, the demand for resources is reduced. These results are promising for improving the mobility and quality of life of these people.