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Research Reports |
D Winter, PhD, PEng, is Professor, Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
A Patla, PhD, is Associate Professor, Department of Kinesiology, University of Waterloo.
J Frank, PhD, is Assistant Professor, Department of Kinesiology, University of Waterloo.
S Walt, MASc, is Research Assistant, Department of Kinesiology, University of Waterloo.
A descriptive study of the biomechanical variables of the walking patterns of the fit and healthy elderly compared with those of young adults revealed several significant differences. The walking patterns of 15 elderly subjects, selected for their active life style and screened for any gait- or balance-related pathological conditions, were analyzed. Kinematic and kinetic data for a minimum of 10 repeat walking trials were collected using a video digitizing system and a force platform. Basic kinematic analyses and an inverse dynamics model yielded data based on the following variables: temporal and cadence measures, heal and toe trajectories, joint kinematics, joint moments of force, and joint mechanical power generation and absorption. Significant differences between these elderly subjects and a database of young adults revealed the following: the same cadence but a shorter step length, an increased double-support stance period, decreased push-off power, a more flat-footed landing, and a reduction in their "index of dynamic balance." All of these differences, except reduction in index of dynamic balance, indicate adaptation by the elderly toward a safer, more stable gait pattern. The reduction in index of dynamic balance suggests deterioration in the efficiency of the balance control system during gait. Because of these significant differences attributable to age alone, it is apparent that a separate gait database is needed in order to pinpoint falling disorders of the elderly.
Key Words: Equilibrium • Geriatrics • Kinesiology/biomechanics, gait analysis • Posture, tests and measurements
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