湯佩芳2006-07-262018-07-082006-07-262018-07-082002http://ntur.lib.ntu.edu.tw//handle/246246/25622This study investigated the balance strategy, as well as center of pressure (COP) trajectory and parameters between healthy adults and patients with hemiplegia in response to slow fast pulling-speed and perturbations in 4 directions (forward, backward, left and right). Twelve healthy adults and 12 hemiplgic patients following mild to moderate stroke participated in this study. There three 3 trials of pulling perturbations at slow (10cm/sec) and fast (30cm/sec) speeds in all four directions. Results revealed that the frequency of stepping was greater in patients with hemiplegia than in healthy adylts (p<0.00I). The COP trajectories of patients with hemiplegia and healthy adults were similar when they used the fixed-support strategy. The COP excursion and COP velocity in slow and fast forward pulling trials, the peak-to-peak amplitude of COP displacement in the direction parallel to the perturbation in slow and fast right-side pulling were smaller in patients with hemiplegia compared to the healthy adults. But the peak-to- peak amplitude of COP displacement in the direction orthogonal to the pulling direction in slow forward pulling trials was greater for patients with herniplegia than for the healthy adults. The COP trajectories of patients with hemiplegia and healthy adults who used the stepping strategy in response to forward or backward pulling perturbations were similar. But the COP trajectory of patients with hemiplegia was different from that of healthy adults when these patients stepped with the unaffected leg in response to pulling perturbation from the unaffected side. There was no significant difference in COP parameters between these two groups when the stepping strategy was used. Patients with hemiplegia following mild to moderate stroke tended to use stepping strategy to recover balance in response to waist pulling perturbations compared to healthy adults. Patients with hemiplegia decreased displacement of center of mass to avoid lose of balance when they used fixed-support strategy. The fact that hcmiparctic pahicnts did not show significant differences in (COP parameters compared to healthy adults may be due to that the majority of stepping strategies were carried out with the unaffected leg of the stroke patients.application/pdf1068865 bytesapplication/pdfzh-TW國立臺灣大學醫學院物理治療學系暨研究所hemiplegiawaist pulling perturbationreactive balance strategytrajectory of center of pressureparameters of center of pressure腦中風患者腰部牽拉干擾測試平縴紂反應策略足底壓力中心移動帆跡形式足底壓力中心相關參數journal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/25622/1/902314B002405.pdf