- Change management Sample size assessment to specify the number of participants or participant years necessary to demonstrate an effect Number of patients: 15 stroke patients. Due to the likely large heterogeneity of the study population (different weights severity of paresis and ataxia, as well as partly cognitive deficits) a sufficiently large number of patients must be tested. Currently, there are no data which would allow a power analysis with respect to the primary or secondary end point. In case of premature withdrawl from the study, those participants will be replaced so that at least 16 participants carry out the 3-month training program completely.