Decreased supraspinal control and neuromuscular function controlling the ankle joint in athletes with chronic ankle instability
Chronic ankle instability (CAI) alters lower extremity neuromuscular function, associated with a change in corticomotor excitability. The aim of this study was to compare corticomotor excitability and neuromuscular function of the muscles around the ankle between athletes with CAI and without CAI (non-CAI).
Nineteen CAI athletes (15 men and 4 women) and 19 non-CAI athletes (15 men and 4 women) participated (age- and sex-matched). Corticomotor excitability was measured by transcranial magnetic stimulation for the following muscles: the tibialis anterior (TA), peroneus longus (PL) and gastrocnemius medialis (GM). The resting motor threshold (rMT), motor evoked potential (MEP), and latency (Lat) were subsequently measured. Neuromuscular function was assessed with a jump test, using the EMG activity before foot contact, peak torque, and joint position sense.
The corticomotor excitability in CAI showed a lower normalized MEP in the TA (p = 0.026) and PL (p = 0.003), and longer latency in the TA (p = 0.049) and GM (p = 0.027) compared with non-CAI. The neuromuscular assessment showed CAI had less EMG activity of the PL (p < 0.001), less peak torque of the dorsiflexor (p = 0.019) muscle compared with non-CAI.
Athletes with CAI had lower corticomotor excitability in the TA and PL and a longer latency in the TA and GM muscles. Additionally, CAI demonstrated functional neuromuscular deficits by decreasing EMG activity of the PL muscle and strength of the dorsiflexor muscle. Our findings indicated maladaptation at both cortical and peripheral levels among athletes with CAI.
KeywordsAnkle sprains Chronic ankle instability Cortical plasticity Corticomotor excitability Neuromuscular function Supraspinal control
Chronic ankle instability
Non-chronic ankle instability
Cumberland ankle instability tool
Maximum voluntary contraction
Transcranial magnetic stimulation
Resting motor threshold
Motor evoked potential
Central nervous system
Anterior cruciate ligament
Statistical parametric mapping
Surface electromyography for the non-invasive assessment of muscles
The Faculty of Physical Therapy and Graduated School, Mahidol University supported this study. We thank Assoc.Prof. James J. Laskin, PhD, PT, for providing helpful comments on this manuscript.
Ampika Nanbancha and Jarugool Tretriluxana formulate research questions, designed experiment interpreted the findings and prepared the manuscript. Ampika Nanbancha performed data collection Komsak Sinsurin, and Weerawat Limroongreungrat were involved in research design supervised and providing guidance. All authors provided critical feedback and helped shape the research, analysis, and approved the manuscript.
Compliance with ethical standards
Conflict of interest
The authors report they have no potential conflict of interest.
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