Ankle muscle activation during the limits of stability test in subjects with chronic ankle instability |
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| Institution: | 1. Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine Department, Rey Juan Carlos University, Madrid, Spain;2. Faculty of Health Sciences, Rey Juan Carlos University, Madrid, Spain;1. Department of Physical Therapy, Center of Health Sciences and Sport, Santa Catarina State University, Rua Pascoal Simoni, 358, Florianopolis, SC 88080-350, Brazil;2. Department of Physical Therapy and Rehabilitation Sciences, School of Health Professions, University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA;1. Department of Physical Therapy – Program in Exercise & Rehabilitation Science, Marquette University, Cramer Hall 004B, 604 N. 16th St. 004B, Milwaukee, WI, 53233, USA;2. School of Kinesiology, University of Michigan, CCRB 4745G, 401 Washtenaw Ave., Ann Arbor, MI, 48109-2214, USA;3. Orthopaedic and Rehabilitation Biomechanics Laboratory, University of Michigan, CCRB 4745G, 401 Washtenaw Ave., Ann Arbor, MI, 48109-2214, USA;4. Department of Physical Therapy – Program in Exercise & Rehabilitation Science, Marquette University, Cramer Hall 215D, 604 N. 16th St. 215D, Milwaukee, WI, 53233, USA;1. Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China;2. Gait and Motion Analysis Center, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China;1. KU Leuven Movement Control and Neuroplasticity Research Group, Leuven, Belgium;2. KU Leuven Human Movement Biomechanics Research Group, Leuven, Belgium;3. KU Leuven Research Group for Musculoskeletal Rehabilitation, Faculty of Kinesiology and Rehabilitation Sciences, Group Biomedical Sciences, 3001 Leuven, Belgium;4. Department of Research, Development & Education, Sint Maartenskliniek, Nijmegen, The Netherlands |
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| Abstract: | ObjectiveTo study postural control and muscle activity during the limit of stability test (LOS) in subjects with chronic ankle instability.DesignObservational study.SettingUniversity laboratory.Participants10 healthy subjects were included in the control group and 10 subjects in the CAI group (age between 18 and 30 years, with history of the multiple ankle “giving way” episodes in the last six months and score ≤24 in the Cumberland Ankle Instability Tool).Main outcome measuresA computerized dynamic posturography equipment was used for assessing the LOS. The electromyography activity of tibialis anterior (TA), soleus (SOL), medial gastrocnemius (MG) and peroneus longus (PL) was registered.ResultsSubjects with CAI had a greater activation in TA to forward (p < .01), forward affected (p = .001), backward affected (p = .007) and backward directions (p < .01); in PL to forward affected (p < .01) and affected directions (p = .001); in MG to forward (p = .023) and affected directions (p < .01) and in SOL to the affected direction (p = .009). We observed restricted excursions and less directional control in subjects with CAI.ConclusionsSubjects with CAI exhibited poorer ability to move their center of gravity within stability limits. In addition, they have an altered ankle muscle activity during LOS test toward the affected ankle joint. |
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| Keywords: | Ankle injuries Electromyography Muscles Motor activity Postural balance Sprain Ankle |
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