The Effect of Different Support Surfaces on Balance in Healthy Individuals

Study Overview
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Brief Summary
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This study will evaluate how age, visual sensation and different ground properties affect of postural sways and stability limits at different support surface widths. 60 individuals will be included in this study.

Detailed Description
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Balance is considered to be an important component of performance during activity as a result of a complex process in which musculoskeletal and neurological systems function. Two different balance states are defined as the static balance where the individuals maintain their inactive position or the dynamic balance when they perform a foreseen movement. The balance is maintained by keeping the center of gravity within the boundaries of the support surface and is provided by sensory impulses from the visual, vestibular and somatosensory systems organized by the central nervous system. Balance is an important factor to lead an independent life, and it is imperative that the balance be ensured in order to ensure that daily living activities are performed safely. The neural control of the bipedal posture varies depending on the width of the supporting surface, which has a significant impact on the frontal plane biomechanics. There is a linear relationship between increased support surface size and mechanical stability. In experimental studies, it has been shown that increasing muscle width levels in response to translational perturbations seen on the support surface on the horizontal plane have decreased with increasing step width. The changes in the preferred support surface vary depending on the age of the external environment, recurrent falls due to decreased sensory input, or various neurological disorders. However, there are few quantitative studies examining the relationship between different support surface widths and equilibrium, and the effect of posture width on sensory feedback control is still poorly understood. This study was planned to evaluate the effect of age, visual sensation and different soil properties on postural release and stability limits at different support surface widths.

Official Title
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The Effect of Different Support Surface on Postural Sway and Limits of Stability in Healthy Individuals

Conditions
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Healthy

Intervention / Treatment
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* Diagnostic Test: balance analysis


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy individuals aged between 18-50 Without any diagnosed disease Individuals who voluntarily agree to participate in this research Exclusion Criteria: The presence of previous lower extremity surgery Pain during evaluation Foot ankle instability Important and irreversible visual deficits Body mass index (BMI) greater than> 40 kg / m² Limitation of ankle, knee and hip joint in lower extremity Muscle strength of the lower extremity (dorsiflexors, plantar flexors, quadriceps, hamstring, gluteus maximus, gluteus medius) and the trunk (rectus abdominous, internal and external oblique abdominals, back extensor) below 5.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 50 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: Screening
Intervention Model: Single Group Assignment
Interventional Model Description: Clinical trials with a single arm
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Healthy Group<br>Postural sway and stability limits in assessment of healthy individuals | Diagnostic Test: balance analysis<br>* Computerized balance analysis system will use to evaluate postural sway and limits of stability at four different support surfaces.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Postural Sway | Postural sways were used to evaluate dynamic balance. Postural sway, in terms of human sense of balance, refers to horizontal movement around the center of gravity. Postural sway was assessed during quite standing with open/closed eyes on a hard/soft floor with the Bertec Balance System on 4 different support surfaces: adjacent feet, width of the bitrochanteric diameter, increased by 50% width of the bitrochanteric diameter and reduced by 50% of the width of the bitrochanteric diameter randomly. | 1 week | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The Limits of Stability | The limits of stability were used to evaluate static balance. Limits of stability is the greatest distance in any direction a person can lean away from a midline vertical position without falling, stepping, or reaching for support. Participants were assessed with a force platform (Model BP 5050; Bertec Corporation, Columbus, Ohio) in terms of support surfaces on limits of stability (LoS) in the right, left, front and back directions when the eyes were open on the hard floor with the Bertec Balance System on 4 different support surfaces: adjacent feet, width of the bitrochanteric diameter, increased by 50% width of the bitrochanteric diameter and reduced by 50% of the width of the bitrochanteric diameter randomly. | 1 week | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Balance, Stance width, Postural sway, Limits of stability