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Decreased supraspinal control and neuromuscular function controlling the ankle joint in athletes with chronic ankle instability

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Purpose

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).

Methods

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.

Results

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.

Conclusion

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.

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Abbreviations

CAI:

Chronic ankle instability

Non-CAI:

Non-chronic ankle instability

TA:

Tibialis anterior

PL:

Peroneus longus

GM:

Gastrocnemius medialis

EMG:

Electromyography

CAIT:

Cumberland ankle instability tool

MVC:

Maximum voluntary contraction

TMS:

Transcranial magnetic stimulation

rMT:

Resting motor threshold

MEP:

Motor evoked potential

Lat:

Latency

CNS:

Central nervous system

ACL:

Anterior cruciate ligament

SPM:

Statistical parametric mapping

SENIAM:

Surface electromyography for the non-invasive assessment of muscles

References

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Acknowledgements

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.

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Authors and Affiliations

Authors

Contributions

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.

Corresponding author

Correspondence to Jarugool Tretriluxana.

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Conflict of interest

The authors report they have no potential conflict of interest.

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Communicated by Lori Ann Vallis.

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Nanbancha, A., Tretriluxana, J., Limroongreungrat, W. et al. Decreased supraspinal control and neuromuscular function controlling the ankle joint in athletes with chronic ankle instability. Eur J Appl Physiol 119, 2041–2052 (2019). https://doi.org/10.1007/s00421-019-04191-w

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  • DOI: https://doi.org/10.1007/s00421-019-04191-w

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