tailieunhanh - Báo cáo hóa học: " Lower extremity fatigue increases complexity of postural control during a single-legged stance"

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: Lower extremity fatigue increases complexity of postural control during a single-legged stance | McGregor et al. Journal of NeuroEngineering and Rehabilitation 2011 8 43 http content 8 1 43 Iril JOURNAL OF NEUROENGINEERING NCR AND REHABILITATION RESEARCH Open Access Lower extremity fatigue increases complexity of postural control during a single-legged stance c 4-I h I Vf z r V 1 A I r ỉ f m rf z t 2 I r ỉ z t z t IZ 3 Crilz K l D r I I h4 D- rr-L-k- Z l4 l r I D - i I r2 Stephen J McGregor W Jeffrey Armstrong James A Yaggie EriK M Bollt Rana rarsnao Jerry J Bailey Sean M Johnson2 Aleta M Goin2 and Samuel R Kelly2 Abstract Background Non-linear approaches to assessment of postural control can provide insight that compliment linear approaches. Control entropy CE is a recently developed statistical tool from non-linear dynamical systems used to assess the complexity of non-stationary signals. We have previously used CE of high resolution accelerometry in running to show decreased complexity with exhaustive exercise. The purpose of this study was to determine if complexity of postural control decreases following fatiguing exercise using CE. Methods Ten subjects 5 M 5 F 25 3 yr cm Kg consented to participation approved by Western Oregon University IRB and completed two trials separated by 2-7 days. Trials consisted of two singlelegged balance tests separated by two Wingate anaerobic tests WAnT rreFat rostFat or rest period rreRest rostRest . Balance tests consisted of a series of five single-legged stances separated by 30 s rest performed while standing on the dominant leg for 15-s with the participant crossing the arms over the chest and flexing the nondominant Knee to 90 degrees. High resolution accelerometers HRA were fixed superficial to L3 L4 at the approximate center of mass COM . Triaxial signals from the HRA were streamed in real time at 625 Hz. COM accelerations were recorded in g s for vertical VT medial lateral ML and anterior posterior AP axes. A newly developed statistic R-test was applied to group response