tailieunhanh - Báo cáo khoa hoc:" Kinematic variability, fractal dynamics and local dynamic stability of treadmill walking"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Kinematic variability, fractal dynamics and local dynamic stability of treadmill walking | JjẸ JOURNAL OF NEUROENGINEERING AND REHABILITATION Kinematic variability fractal dynamics and local dynamic stability of treadmill walking Terrier and Deriaz Terrier and Dériaz Journal of NeuroEngineering and Rehabilitation 2011 8 12 http content 8 1 12 24 February 2011 2 BioMed Central Terrier and Dériaz Journal of NeuroEngineering and Rehabilitation 2011 8 12 http content 8 1 12 Hill JOURNAL OF NEUROENGINEERING NCR AND REHABILITATION RESEARCH Open Access Kinematic variability fractal dynamics and local dynamic stability of treadmill walking Philippe Terrier1 2 Olivier Deriaz1 2 Abstract Background Motorized treadmills are widely used in research or in clinical therapy. Small kinematics kinetics and energetics changes induced by Treadmill Walking TW as compared to Overground Walking OW have been reported in literature. The purpose of the present study was to characterize the differences between OW and TW in terms of stride-to-stride variability. Classical Standard Deviation SD and non-linear fractal dynamics local dynamic stability methods were used. In addition the correlations between the different variability indexes were analyzed. Methods Twenty healthy subjects performed 10 min TW and OW in a random sequence. A triaxial accelerometer recorded trunk accelerations. Kinematic variability was computed as the average SD MeanSD of acceleration patterns among standardized strides. Fractal dynamics scaling exponent a was assessed by Detrended Fluctuation Analysis DFA of stride intervals. Short-term and long-term dynamic stability were estimated by computing the maximal Lyapunov exponents of acceleration signals. Results TW did not modify kinematic gait variability as compared to OW multivariate T2 p . Conversely TW significantly modified fractal dynamics t-test p and both short and long term local dynamic stability T2 p . No relationship was observed between variability indexes with the exception of .

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