Article

Some cases of repeated inversion ankle sprains are thought to have a
neurological basis and are termed functional ankle instability (FAI). In addition
to factors local to the ankle, such as loss of proprioception, cognitive demands
have the ability to influence motor control and may increase the risk of
repetitive lateral sprains.
The purpose of this study was to
investigate the effect of cognitive demand on foot kinematics in physically
active people with functional ankle instability. METHODS: 21 physically active
participants with FAI and 19 matched healthy controls completed trials of normal
walking (single task) and normal walking while performing a cognitive task (dual
task). Foot motion relative to the shank was recorded. Cognitive performance,
ankle kinematics and movement variability in single and dual task conditions was
characterized. RESULTS: During normal walking, the ankle joint was significantly
more inverted in FAI compared to the control group pre and post initial contact.
Under dual task conditions, there was a statistically significant increase in
frontal plane foot movement variability during the period 200ms pre and post
initial contact in people with FAI compared to the control group (p<0.05). Dual
task also significantly increased plantar flexion and inversion during the period
200ms pre and post initial contact in the FAI group (p<0.05). CONCLUSION:
participants with FAI demonstrated different ankle movement patterns and
increased movement variability during a dual task condition. Cognitive load may
increase risk of ankle instability in these people.
CI - Copyright (c) 2016 Elsevier B.V. All rights reserved.

Langue : ANGLAIS