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Journal of Sport and Health Science 2016年第1期5卷 14-24页

作者： james r.chagdes Jessica E.Huber Meredith Saletta Meghan Darling-White Arvind raman Shirley rietdyk Howard N.Zelaznik Jeffrey M.Haddad Department of Mechanical and Manufacturing Engineering Miami University Oxford OH 45056 USA Department of Speech Language and Hearing Sciences Purdue University west Lafayette IN 47907 USA Department of communication Sciences and Disorders University of Iowa Iowa City IA 52242 USA Department of Speech Language and Hearing Sciences University of Arizona Tucson AZ 85721 USA School of Mechanical Engineering Purdue University West Lafayette IN 47907 USA Department of Health and Kinesiology Purdue University West Lafayette IN 47907 USA

Background:Many disease-specific factors such as muscular weakness,increased muscle stiffness,varying postural strategies,and changes in postural reflexes have been shown to lead to postural instability and fall risk in people with Parkinson's disease(PD).recently,analytical techniques,inspired by the dynamical systems perspective on movement control and coordination,have been used to examine the mechanisms underlying the dynamics of postural declines and the emergence of postural instabilities in people with ***:A wavelet-based technique was used to identify limit cycle oscillations(LCOs) in the anterior–posterior(AP) postural sway of people with mild PD(n = 10) compared to age-matched controls(n = 10).Participants stood on a foam and on a rigid surface while completing a dual task(speaking).results:There was no significant difference in the root mean square of center of pressure between *** out of 10 participants with PD demonstrated LCOs on the foam surface,while none in the control group demonstrated *** inverted pendulum model of bipedal stance was used to demonstrate that LCOs occur due to disease-specific changes associated with PD:time-delay and neuromuscular feedback ***:Overall,the LCO analysis and mathematical model appear to capture the subtle postural instabilities associated with mild *** addition,these findings provide insights into the mechanisms that lead to the emergence of unstable posture in patients with PD.

关键词：帕金森病周期振荡姿势间歇性动力学机制 LCOS 限位不稳定性

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