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Cortical mapping of the infraspinatus muscle in healthy individuals

Ngomo Suzy, Mercier Catherine et Roy Jean-Sébastien. (2013). Cortical mapping of the infraspinatus muscle in healthy individuals. BMC Neuroscience, 14, (1), p. 52.

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Background : While cortical representations of intrinsic hand muscles have been extensively studied in healthy individuals, little is known about the representation of proximal upper limb muscles. Improving our understanding of normal shoulder function is important, given that shoulder musculoskeletal disorders affect approximately 20% of the population and are suspected to involve changes in central motor representations. The purpose of the study is to describe the motor representation (motor evoked potentials (MEP) amplitude at the hotspot, map area, normalized map volume and center of gravity) of the infraspinatus muscle in healthy individuals, and to explore the potential influence of hand dominance on this representation (i.e. symmetry of the excitability and of the location of motor map between sides), as well as the effect of age and gender on motor excitability.

Results : Fifteen healthy participants took part in this study. No significant asymmetry between sides was observed for motor excitability (p = 0.14), map area (p = 0.73) and normalized map volume (p = 0.34). Moreover, no side x intensity interaction was found (p = 0.54), indicating similar stimulus response properties. No difference between sides was found in the location of infraspinatus motor representation, either in the mediolateral or anteroposterior axis (p > 0.10). Neither age nor gender influenced aMT (p > 0.58) or MEP size (p > 0.61).

Conclusions : As the cortical representation of infraspinatus muscles was found to be symmetric between sides, both in terms of excitability and location, comparisons between the intact and affected side could be performed in clinical studies, regardless of whether the dominant or non-dominant side is affected. The next step will be to characterize corticospinal excitability and map parameters in populations with shoulder disorders.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 52
Version évaluée par les pairs:Oui
Sujets:Sciences de la santé
Sciences de la santé > Sciences de l'activité physique et réadaptation > Physiothérapie
Sciences de la santé > Sciences médicales > Physiologie
Département, module, service et unité de recherche:Départements et modules > Département des sciences de la santé > Unité d'enseignement en physiothérapie
Mots-clés:Shoulder, motor cortex, motor excitability, rotator cuff, motor threshold, cortical representation, infraspinatus, épaule, cortex moteur, représentation corticale, excitabilité moteur
Déposé le:08 avr. 2016 01:48
Dernière modification:25 nov. 2016 18:26
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