کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10433175 910278 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamic margins of stability during human walking in destabilizing environments
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی پزشکی
پیش نمایش صفحه اول مقاله
Dynamic margins of stability during human walking in destabilizing environments
چکیده انگلیسی
Understanding how humans maintain stability when walking, particularly when exposed to perturbations, is key to preventing falls. Here, we quantified how imposing continuous, pseudorandom anterior-posterior (AP) and mediolateral (ML) oscillations affected the control of dynamic walking stability. Twelve subjects completed five 3-minute walking trials in the Computer Assisted Rehabilitation ENvironment (CAREN) system under each of 5 conditions: no perturbation (NOP), AP platform (APP) or visual (APV) or ML platform (MLP) or visual (MLV) oscillations. We computed AP and ML margins of stability (MOS) for each trial. Mean MOSml were consistently slightly larger during all perturbation conditions than during NOP (p≤0.038). Mean MOSap for the APP, MLP and MLV oscillations were significantly smaller than during NOP (p<0.0005). Variability of both MOSap and MOSml was significantly greater during the MLP and MLV oscillations than during NOP (p<0.0005). We also directly quantified how the MOS on any given step affected the MOS on the following step using first-return plots. There were significant changes in step-to-step MOSml dynamics between experimental conditions (p<0.0005). These changes suggested that subjects may have been trying to control foot placement, and consequently stability, during the perturbation conditions. Quantifying step-to-step changes in margins of dynamic stability may be more useful than mean MOS in assessing how individuals control walking stability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Biomechanics - Volume 45, Issue 6, 5 April 2012, Pages 1053-1059
نویسندگان
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