Abstract
Daily Achilles tendon vibration has been shown to increase muscle force, likely via corticospinal neural adaptations. The aim of the present study was to determine the extent by which corticospinal excitability is influenced during direct Achilles tendon vibration. Motor-evoked potentials (MEPs) were elicited in the soleus (SOL), gastrocnemius medialis (GM) and tibialis anterior (TA) by transcranial magnetic stimulation of the motor cortical area of the leg with and without Achilles tendon vibration at various frequencies (50, 80 and 110 Hz). Contralateral homologues were also investigated. SOL and GM MEP amplitude significantly increased by 226 ± 188 and 66 ± 39 %, respectively, during Achilles tendon vibration, without any difference between the tested frequencies. No MEP changes were reported for TA or contralateral homologues. Increased SOL and GM MEP amplitude suggests increased vibration-induced corticospinal excitability independent of vibration frequency.
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Abbreviations
- GM:
-
Gastrocnemius medialis
- MEP:
-
Motor-evoked potential
- rMT:
-
Resting motor threshold
- SOL:
-
Soleus
- TA:
-
Tibialis anterior
- TMS:
-
Transcranial magnetic stimulation
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Acknowledgments
We sincerely acknowledge Dr. Léonard Féasson for conducting medical inclusions and Régis Bonnefoy for technical assistance. We also thank Rodolphe Testa and Thierry Busso for helping with statistical analysis. J.T. was supported by a doctoral research grant from the Rhône-Alpes Region. P.A. was supported by a doctoral research grant from the General Directorate for Armament, Ministry of Defence (France).
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The authors declare that they have no competing interests.
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Lapole, T., Temesi, J., Gimenez, P. et al. Achilles tendon vibration-induced changes in plantar flexor corticospinal excitability. Exp Brain Res 233, 441–448 (2015). https://doi.org/10.1007/s00221-014-4125-4
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DOI: https://doi.org/10.1007/s00221-014-4125-4