Relationship Between Hip Abductor Strength and Ankle Stability

Study Overview
=================
Brief Summary
-----------------
Ankle sprains are one of the most common injuries in sports. The analysis of risk factors is a priority in order to guide rehabilitation and prevention programs. Among risk factors identified in the literature, weakness of the hip abductor muscles represent a factor favoring recurrent ankle sprains. However, only few studies have investigate the link between the strength of the hip abductor muscles and the deficits in stabilization of the ankle joint. Furthermore, these few studies analysed landing task or undisturbed balance task. It would be interesting to further understand the impact and role of hip abductor muscles on ankle stability during specific ankle-destabilizing task. The main objective of this study is to establish a link between the strength of the hip abductor muscles and the dynamic postural control performance measured by the modified Star Excursion Balance Test (SEBTm). Secondly, it will be necessary to study the kinematic and neuromuscular control characteristics of the ankle during 4 functional tests: SEBTm Static unipodal balance Weight-bearing inversion test Weight-bearing eversion test These tests will be realized with an ankle destabilizing device. The device is a sandal equipped of an articulator under the rear foot which allow movements in inversion and eversion. Furthermore, tests are realized two times, before and immediatly after a fatiguing exercise. The fatiguing exercise consists to implemented local fatigue on hip abductor muscles by repeating abductions.

Official Title
-----------------
Relationship Between Hip Abductor Strength and Ankle Stability

Conditions
-----------------
Fatigue

Intervention / Treatment
-----------------
* Other: Fatigue (physical exercise)


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Males and females between 18 and 35 years old Subject's non-opposition to participate in the study Practicing regular physical activity (> 2 hours per week) No contraindication to carrying out the protocol Affiliation to a French social security scheme or beneficiary of such a scheme Exclusion Criteria: Males or females under 18 or over 35 years History of lower limb injuries in the 6 months preceding the protocol Diagnosis of chronic ankle instability Subject unlikely to cooperate with the study and / or weak cooperation anticipated by the investigator Subject's opposition to participating in the study Subject without health insurance Pregnant woman

Ages Eligible for Study
-----------------
Minimum Age: 18 Years
Maximum Age: 35 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
Accepts Healthy Volunteers

Study Plan
=================
How is the study designed?
-----------------

Design Details

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


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Healthy<br>Subjects were evaluated before and after a fatiguing exercise of hip abductor muscles that consisted to repeat hip abduction with rate and range of motion until a target decrease of force is attempt | Other: Fatigue (physical exercise)<br>* Subjects were evaluated before and after a fatiguing exercise of hip abductor muscles that consisted to repeat hip abduction with rate and range of motion until a target decrease of force is attempt<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Surface Electromyography intensity change | Measure of muscles activity if peroneus longus and brevis, tibialis anterior, gluteus medius and gastrocnemuis lateralis using wireless and surface electrodes fixed with strap on the skin of subjects | 5 minutes before physical exercise | 
| Surface Electromyography intensity change | Measure of muscles activity if peroneus longus and brevis, tibialis anterior, gluteus medius and gastrocnemuis lateralis using wireless and surface electrodes fixed with strap on the skin of subjects | 5 minutes after physical exercise | 
| Frontal inclination of ankle change | Measure of accelerations of ankle joint during tests using inertial measurement unit | 5 minutes before physical exercise | 
| Frontal inclination of ankle change | Measure of accelerations of ankle joint during tests using inertial measurement unit | 5 minutes after physical exercise | 
| SEBT performances change | Performances (distance in cm) attempted in each direction of the dynamic postural test | 5 minutes before physical exercise | 
| SEBT performances change | Performances (distance in cm) attempted in each direction of the dynamic postural test | 5 minutes after physical exercise | 
| Hip abductor strength change | Measure of maximal isometric strength with a S-shape force transducer | 5 minutes before physical exercise | 
| Hip abductor strength change | Measure of maximal isometric strength with a S-shape force transducer | 5 minutes after physical exercise | 
| Angular velocity of ankle change | Measure of angular velocity of ankle joint during tests using inertial measurement unit | 5 minutes before physical exercise | 
| Angular velocity of ankle change | Measure of angular velocity of ankle joint during tests using inertial measurement unit | 5 minutes after physical exercise | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Balance, Ankle, Destabilization, Prevention, Hip fatigue