Main criteria for stroke group inclusion: 1) patients with ischemic stroke; 2) patients with hemiparesis after 5 to 7 week after stroke; 3) subjects with stable trunk (the Trunk Control Test 70-100 points); 4) subjects who were in a functional state allowing walking (Rankin Scale ≤ 3); 5) no severe deficits in communication, memory, or understanding what can impede proper measurement performance; 6) at least 22 years of age; maximum 83 years of age.  Main criteria for stroke group exclusion: 1) stroke up to five weeks after the episode, 2) epilepsy, 3) lack of trunk stability, 4) lack of independent walking, 5) high or very low blood pressure, dizziness, malaise.  Main criteria for control group inclusion: 1) the control group consisted of subjects with stable trunk (TCT 100 points); correct muscle tension (MAS 0), independent walking; 2) at least 22 years of age; maximum 83 years of age.  Criteria for control group exclusion: 1) a history of neurologic or musculoskeletal disorders such as stroke or brain injury or other conditions that could affect their ability to active movement the trunk and the legs; 2) back pain; 3) no severe deficits in communication, memory, or understanding what can impede proper measurement performance; 4) high or very low blood pressure, dizziness, malaise.