Control of center of mass motion state through cuing and decoupling of spontaneous gait parameters in level walking |
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| Authors: | DD Espy F Yang Y-C Pai |
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| Institution: | 1. Department of Physical Therapy, University of Illinois at Chicago, Chicago, IL 60612, USA;2. Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL 60612, USA;1. University of Kansas Medical Center, Landon Center on Aging, 3901 Rainbow Blvd, Mail stop 1005, Kansas City, KS 66160, United States;2. Oregon Health & Science University, Department of Neurology, 3181 SW Sam Jackson Park Rd, L226, Portland, OR 97239, United States;3. VA Portland VA Health Care System, Neurology Department, PNEUR, 3710 SW US Veterans Hospital Rd, Portland, OR 97239, United States;1. Department of Mechanical Engineering, University of Wisconsin–Madison, Madison, WI, USA;2. Department of Biomedical Engineering, University of Wisconsin–Madison, Madison, WI, USA;3. Department of Orthopedics and Rehabilitation, University of Wisconsin–Madison, Madison, WI, USA;1. Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, United States;2. Department of Biostatistics, University of North Carolina at Chapel Hill, United States;1. Department of Movement Science, Sport and Leisure Studies, Westfield State University, Westfield, MA, USA;2. Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill, NC, USA;1. Department of Rehabilitation Science, The Graduate School, Inje University, Republic of Korea;2. Department of Physical Therapy, College of Biomedical Science and Engineering, Inje University, 607 Obang-dong, Gimhae, Gyeongsangnam-do, 621-749 Republic of Korea |
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| Abstract: | Can the center of mass (COM) motion state, i.e., its position and velocity relative to the base of support (BOS), which dictate gait stability, be predictably controlled by the global gait parameters of step length and gait speed, or by extension, cadence? The precise relationships among step length and gait speed, and the COM motion state are unknown, partially due to the interdependence between step length and gait speed and the difficulty in independent control of both parameters during spontaneous level walking. The purposes of this study were to utilize simultaneous audio-visual cuing to independently manipulate step length and gait speed, and to determine the extent to which the COM position and velocity can be subsequently controlled. Fifty-six young adults were trained at one of the three gait patterns in which both the step length and gait speed were targeted simultaneously. The results showed that the cuing could successfully “decouple” gait speed from step length. Although this approach did yield reliable control of the COM velocity through manipulation of gait speed (R2=0.97), the manipulation of step length yielded less precise control of COM position (R2=0.60). This latter control appears to require manipulation of an additional degree-of-freedom at the local segment level, such that the inclusion of trunk inclination with step length improved the prediction of COM position (R2=0.80). |
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