NDLI: The gait standard deviation, a single measure of kinematic variability.

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The gait standard deviation, a single measure of kinematic variability.

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Letter to the Editor: On 'Advantages and disadvantages of stiffness instructions when studying postural control' by C.T. Bonnet: Comments on 'Advantages and disadvantages of stiffness instructions when studying postural control'. (Part 1)

Letter to the Editor: On 'Advantages and disadvantages of stiffness instructions when studying postural control' by C.T. Bonnet: Comments on 'Advantages and disadvantages of stiffness instructions when studying postural control'. (Part 2)

Letter to the Editor: On 'Advantages and disadvantages of stiffness instructions when studying postural control' by C.T. Bonnet: You just can't win: Advantages and disadvantages of the postural stability requirement.

Advantages and disadvantages of stiffness instructions when studying postural control: Author response to the letter.

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The gait standard deviation, a single measure of kinematic variability.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sangeux, Morgan Passmore, Elyse Graham, H. Kerr Tirosh, Oren
Description	Author Affiliation: Sangeux M ( The Royal Children's Hospital, Melbourne, Australia); Passmore E ( The Royal Children's Hospital, Melbourne, Australia); Graham HK ( The Royal Children's Hospital, Melbourne, Australia); Tirosh O ( The Royal Children's Hospital, Melbourne, Australia.)
Abstract	Measurement of gait kinematic variability provides relevant clinical information in certain conditions affecting the neuromotor control of movement. In this article, we present a measure of overall gait kinematic variability, GaitSD, based on combination of waveforms' standard deviation. The waveform standard deviation is the common numerator in established indices of variability such as Kadaba's coefficient of multiple correlation or Winter's waveform coefficient of variation. Gait data were collected on typically developing children aged 6-17 years. Large number of strides was captured for each child, average 45 (SD: 11) for kinematics and 19 (SD: 5) for kinetics. We used a bootstrap procedure to determine the precision of GaitSD as a function of the number of strides processed. We compared the within-subject, stride-to-stride, variability with the, between-subject, variability of the normative pattern. Finally, we investigated the correlation between age and gait kinematic, kinetic and spatio-temporal variability. In typically developing children, the relative precision of GaitSD was 10% as soon as 6 strides were captured. As a comparison, spatio-temporal parameters required 30 strides to reach the same relative precision. The ratio stride-to-stride divided by normative pattern variability was smaller in kinematic variables (the smallest for pelvic tilt, 28%) than in kinetic and spatio-temporal variables (the largest for normalised stride length, 95%). GaitSD had a strong, negative correlation with age. We show that gait consistency may stabilise only at, or after, skeletal maturity.
File Format	HTM / HTML
ISSN	09666362
Journal	Gait & Posture
Volume Number	46
e-ISSN	18792219
Language	English
Publisher	Elsevier
Publisher Date	2016-05-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Orthopedics
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Rehabilitation Biophysics Sports Science

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