Clinical trial NCT04174027: The Effect of Perturbration on Balance Control in Adults
Official title: The Effect of Perturbration on Balance Control in Adults
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Chronic Ankle Instability
Keywords: Chronic ankle instability ( CAI )
Perturbration
reactive postural control
balance
center of pressure - COP
Lead sponsor: Meir Medical Center
Sponsor class: OTHER
First posted: 2019-11-22
Enrollment: 100
Sex: ALL
Minimum age (years): 18
Maximum age (years): 50
Standard ages: ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Physical education students from Zinman College in Wingate

Brief summary: Balance control in respond to an unexpected platform perturbration during standing and walking: comparison between individuals with chronic ankle instability and healthy individuals.

Detailed description: 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.

Eligibility criteria: Inclusion Criteria:

* age 18-50
* good health
* active people

Exclusion Criteria:

* Body weight greater than 135 kg
* Bone instability (non-consolidated fractures, unstable spinal column, severe osteoporosis)
* Head damage in the year prior to the study
* Diabetics or Unstable circulation
* Cardiac (blood) contraindications
* Vestibular problem
* Neurological deficits
* Mechanical ventilation problem
* Severe vascular disorders of the lower limbs

Primary outcomes:
measure: static balance control in reaction to perturbration
timeFrame: 20 minutes
measure: dynamic balance control un reaction to perturbration
timeFrame: 10 minutes
Secondary outcomes:
measure: Time to returning to original condition
timeFrame: 30 minutes
Other outcomes:
measure: movement inside the foot during balance control.
timeFrame: 30 minutes
Locations:
Study officials:
References: