Intra-session reliability of local dynamic stability of walking.
نویسندگان
چکیده
While local dynamic stability measures have been successfully used to characterize walking stability, they require long continuous walking data, which may be difficult to obtain from a clinical population. We investigated the amount of walking data necessary to obtain reliable measures of local dynamic stability. Twenty healthy adults walked on a motorized treadmill at their self-selected speed for three trials of 5 min each. Trunk motion was used to construct a 12-dimensional state space comprised of the linear and angular positions and velocities. Mean divergence of locally perturbed trajectories was calculated as a measure of local dynamic stability using the first 1-5 min of data from each trial. Exponential divergence rates were quantified. Divergence was also parameterized using a double-exponential function. Intra-class correlation coefficients ICC(2,1) were calculated for each divergence measure for each trial length. ICC(2, 1) values increased with trial length, and reached 0.5-0.9. Good reliability was obtained for short-term measures for trial lengths of 2 and 3 min, but 5 min was not adequate to estimate the long-term coefficients based on a single trial.
منابع مشابه
Assessing gait stability: the influence of state space reconstruction on inter- and intra-day reliability of local dynamic stability during over-ground walking.
Estimating local dynamic stability is considered a powerful approach to identify persons with balance impairments. Its validity has been studied extensively, and provides evidence that short-term local dynamic stability is related to balance impairments and the risk of falling. Thus far, however, this relation has only been proven on group level. For clinical use, differences on the individual ...
متن کاملReliability and Minimum Detectable Change of Temporal-Spatial, Kinematic, and Dynamic Stability Measures during Perturbed Gait
Temporal-spatial, kinematic variability, and dynamic stability measures collected during perturbation-based assessment paradigms are often used to identify dysfunction associated with gait instability. However, it remains unclear which measures are most reliable for detecting and tracking responses to perturbations. This study systematically determined the between-session reliability and minimu...
متن کاملTest-Retest Reliability of Dynamic Postural Stability Measures in Healthy and Chronic Non-specific Low Back Pain Groups
Objective: The primary aim of the present study was to study the reliability of postural stability measures during whole body dynamic conditions, so they can be used in postural stability evaluations, investigations of injury mechanisms and assessments of treatment efficacy. Materials & Methods: Twelve healthy volunteers and 12 low back pain patients performed repeated trunk bending motions ...
متن کاملCould Local Dynamic Stability Serve as an Early Predictor of Falls in Patients with Moderate Neurological Gait Disorders? A Reliability and Comparison Study in Healthy Individuals and in Patients with Paresis of the Lower Extremities
Falls while walking are frequent in patients with muscular dysfunction resulting from neurological disorders. Falls induce injuries that may lead to deconditioning and disabilities, which further increase the risk of falling. Therefore, an early gait stability index would be useful to evaluate patients in order to prevent the occurrence of future falls. Derived from chaos theory, local dynamic ...
متن کاملTo what extent does not wearing shoes affect the local dynamic stability of the gait? Effect size and intra-session repeatability
Funding: The study was not supported by specific funding. The Institute for Research in Rehabilitation (IRR) is financially supported by the State of Valais, the City of Sion, the Clinique Romande de Réadaptation, and the Swiss accident insurance company SUVA. Abstract Local dynamic stability (LDS) quantifies how a system responds to small perturbations. Several experimental and clinical findin...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Gait & posture
دوره 24 3 شماره
صفحات -
تاریخ انتشار 2006