Chronic Ankle Instability Clinical Trial
Official title:
The Effect of Perturbration on Balance Control in Adults
Balance control in respond to an unexpected platform perturbration during standing and walking: comparison between individuals with chronic ankle instability and healthy individuals.
An unexpected postural perturbration is a major risk factor of falls and injuries during
gait. A postural perturbration is a sudden change in conditions that displaces the body
posture away from equilibrium. Reactive postural control response is an immediate ( 70-120 ms
) automatic "like reflex" response which is initiated by unexpected postural perturbration in
order to maintain balance. Even among young healthy adults there could be a problem in
balance performance which does not become evident untill a slip or a trip or any other sudden
perturbration happens. Thus a simple test of pertubration while standing or walking can
identify a problem .
This study is comparing the reactive postural control of physical education students who
suffer from chronic ankle instability (CAI) to healthy students on a Perturbation Treadmill.
The device consists of a treadmill mounted on a moving force plate platform. The platform
moves in the medial/ lateral plains to simulate a slip and a trip in both the standing and
walking phase. Their reactive postural control is tested in a few conditions: standing on
both legs - eyes open and eyes closed, in tandem standing, standing on one leg and in
walking. In each condition the perturbration is given every 5-15 seconds in different speed
and in unexpected direction (right /left). Lost of balance control is any change in the
original location of the foot in standing conditions or stepping out of the treadmill.
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