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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Gait symmetry and regularity in transfemoral amputees assessed by trunk accelerations | Tura et al. Journal of NeuroEngineering and Rehabilitation 2010 7 4 http www.jneuroengrehab.eom content 7 1 4 l dl JOURNAL OF NEUROENGINEERING NCR AND REHABILITATION RESEARCH Open Access Gait symmetry and regularity in transfemoral amputees assessed by trunk accelerations Andrea Tura1 2 Michele Raggi3 Laura Rocchi 2 Andrea G Cutti3 Lorenzo Chiari2 Abstract Background The aim of this study was to evaluate a method based on a single accelerometer for the assessment of gait symmetry and regularity in subjects wearing lower limb prostheses. Methods Ten transfemoral amputees and ten healthy control subjects were studied. For the purpose of this study subjects wore a triaxial accelerometer on their thorax and foot insoles. Subjects were asked to walk straight ahead for 70 m at their natural speed and at a lower and faster speed. Indices of step and stride regularity Ad1 and Ad2 respectively were obtained by the autocorrelation coefficients computed from the three acceleration components. Step and stride durations were calculated from the plantar pressure data and were used to compute two reference indices SI1 and SI2 for step and stride regularity. Results Regression analysis showed that both Ad1 well correlates with SI1 R2 up to 0.74 and Ad2 well correlates with SI2 R2 up to 0.52 . A ROC analysis showed that Ad1 and Ad2 has generally a good sensitivity and specificity in classifying amputee s walking trial as having a normal or a pathologic step or stride regularity as defined by means of the reference indices SI1 and SI2. In particular the antero-posterior component of Ad1 and the vertical component of Ad2 had a sensitivity of 90.6 and 87.2 and a specificity of 92.3 and 81.8 respectively. Conclusions The use of a simple accelerometer whose components can be analyzed by the autocorrelation function method is adequate for the assessment of gait symmetry and regularity in transfemoral amputees. Background Symmetry and regularity of walking are two important aspects in .
