QUANTITATIVE-ANALYSIS OF RISING FROM A CHAIR IN HEALTHY AND HEMIPARETIC SUBJECTS

In 15 healthy and 20 hemiparetic persons we studied standing-up by two force-plates. Phases before and after the seat-off, force distributio n and centre of gravity displacement were assessed. The patients rose significantly slower. The force ratios after seat-off differed signifi cantly between the groups (0.88 vs 0.68). Left/right hemiparetic patie nts put more weight on the affected limb in 18%/11% of the trials befo re seat-off, with its insufficient use after it mainly in the left pat ients. At seat-off, projection of the centre of gravity fell within th e support area in hemiparetic patients, and 3 cm behind it in healthy subjects. With larger lateral displacement of the centre of gravity in the hemiparetic group, left hemiparetic patients mostly shifted their weight to the non-affected side and right hemiparetic patients to bot h sides. Weight distribution and mediolateral displacement of the cent re of gravity in the left and right hemiparetic patients were consider ed.