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J Korean Acad Rehabil Med. 2004 Oct;28(5):488-493. Korean. Original Article.
Lee JH , Park SW , Kim DA , Jang SJ , Kim YH , Yi JB .
Department of Rehabilitation Medicine, National Rehabilitation Hospital, Korea.
Department of Biomedical Engineering, Research Institute of Medical Engineering, Research Institute for Instruments and Rehabilitation Engineering, Yonsei University, Korea.
Department of Prosthetics and Orthotics, Hanseo University, Korea.

OBJECTIVE: The aim of this study is to evaluate the acceleration of the center of mass (COM) of the body in stroke patients. METHOD: Seventeen stroke patients and 9 normal subjects were participated. Three dimensional gait analysis was used to classify gait phases for the reference. The accelerometer held over the COM were used to record vertical and medio- lateral accelerations of the COM of the body. Modified Ashworth scale and Brunnstrom stage were used to evaluate the clinical status of stroke patients. RESULTS: In normal subjects, the acceleration showed symmetric pattern. The maximum peak of vertical acceleration occurred in loading response. In stroke patients, the acceleration wave was characterized by asymmetry and polyphasicity. Maximum peak in affected side was higher than that in unaffected side (p<0.05). There were significant correlations between several elements of hemiplegic gait and the correspondent acceleration values; interval of successive peak I in vertical acceleration vs. step time, walking velocity and swing symmetry ratio vs. mean peak I, swing symmetry ratio vs. affected side peak I, step length symmetry ratio vs. peak I symmetry ratio. CONCLUSION: The accelerometer can be an easy and useful way to evaluate gait characteristics in stroke patients.

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