Balance Control During Gait

Study Overview
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Brief Summary
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Gait and balance disorders are important public health problem necessitating studies to try to prevent falls. Many studies have dealt with spatiotemporal gait parameters or balance during quiet standing (posturography). Nevertheless, falls occurred predominantly during gait, and rarely during quiet standing. We have developed a tool to measure balance during gait : the braking of the center of mass (CM), a biomechanical parameter obtained from the vertical velocity of the CM recorded with a force plate. In previous studies, we have shown that the braking of the CM was a physiological and a active mechanism, reflecting balance during gait. Unfortunately, the braking of the CM measured on a force plate provide an important intra-individual variability. The 3D optoelectronic gait analysis system (VICON) also provide an estimation of the CM. The primary goal of this study is to compare intra-individual variability of the braking of the CM determined by a force plate or the 3D optoelectronic gait analysis system (VICON) in healthy subjects.

Official Title
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A Study of the Balance Control During Gait : Comparison of Data Acquisition Between Force Plate and 3D Optoelectronic Gait Analysis System

Conditions
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Healthy

Intervention / Treatment
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* Other: Gait analysis


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy subjects Between 20 and 40 years old Effective contraception for women of childbearing age Exclusion Criteria: Neurological, vestibular, rheumatologic, orthopaedic disorders, which could influence gait and balance. Known spinal deformity Severe visual impairment : visual acuity less than 6/10 Inability to stand and walk without assistance 15 meters Subjects without social security Subjects involved in another biomedical trial during this study Pregnant or breastfeeding women

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Gait analysis<br> | Other: Gait analysis<br>* Subjects, barefoot and standing upright and motionless on a force plate, were instructed to walk for 10 m following a beep delivered by the experimenter. Two experimental conditions were tested: (i) the 'natural' gait condition where subjects walked normally and (ii) the 'fast' gait condition where subjects walked as fast as they could, taking large steps. Each subject performed 10 trials in each condition.<br>* Other names: - 3D optoelectronic gait analysis system (VICON);|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Braking of the center of mass index during gait initiation | Braking of the center of mass (CM), a biomechanical parameter obtained from the vertical velocity of the CM, determined by a force plate or a 3D optoelectronic gait analysis system (VICON). | 1 day | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Braking of the center of mass index during locomotion | Braking of the center of mass (CM), a biomechanical parameter obtained from the vertical velocity of the CM, determined by a 3D optoelectronic gait analysis system (VICON). | 1 day | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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subjects