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Neural Drive and Motor Unit Characteristics of the Serratus Anterior in Individuals With Scapular Dyskinesis.
Kuniki, Masahiro; Iwamoto, Yoshitaka; Konishi, Rei; Kuwahara, Daisuke; Yamagiwa, Daiki; Kito, Nobuhiro.
Afiliación
  • Kuniki M; Graduate School of Medical Welfare Sciences, Medical Engineering, Hiroshima International University, Higashi-hiroshima, Hiroshima, Japan.
  • Iwamoto Y; Department of Neuromechanics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
  • Konishi R; Department of Rehabilitation, Faculty of Rehabilitation, Hiroshima International University, Higashi-hiroshima, Hiroshima, Japan.
  • Kuwahara D; Graduate School of Medical Welfare Sciences, Medical Engineering, Hiroshima International University, Higashi-hiroshima, Hiroshima, Japan.
  • Yamagiwa D; Graduate School of Medical Welfare Sciences, Medical Engineering, Hiroshima International University, Higashi-hiroshima, Hiroshima, Japan.
  • Kito N; Department of Rehabilitation, Faculty of Rehabilitation, Hiroshima International University, Higashi-hiroshima, Hiroshima, Japan.
J Musculoskelet Neuronal Interact ; 24(2): 148-158, 2024 Jun 01.
Article en En | MEDLINE | ID: mdl-38825997
ABSTRACT

OBJECTIVE:

Scapular dyskinesis is one of the causes of shoulder disorders and involves muscle weakness in the serratus anterior. This study investigated whether motor unit (MU) recruitment and firing property, which are important for muscle exertion, have altered in serratus anterior of the individuals with scapular dyskinesis.

METHODS:

Asymptomatic adults with (SD) and without (control) scapular dyskinesis were analyzed. Surface electromyography (sEMG) waveforms were collected at submaximal voluntary contraction of the serratus anterior. The sEMG waveform was decomposed into MU action potential amplitude (MUAPAMP), mean firing rate (MFR), and recruitment threshold. MUs were divided into low, moderate, and high thresholds, and MU recruitment and firing properties of the groups were compared.

RESULTS:

High-threshold MUAPAMP was significantly smaller in the SD group than in the control group. The control group also exhibited recruitment properties that reflected the size principle, however, the SD group did not. Furthermore, the SD group had a lower MFR than the control group.

CONCLUSIONS:

Individuals with scapular dyskinesis exhibit altered MU recruitment properties and lower firing rates of the serratus anterior; this may be detrimental to muscle performance. Thus, it may be necessary to improve the neural drive of the serratus anterior when correcting scapular dyskinesis.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Escápula / Discinesias / Electromiografía Límite: Adult / Female / Humans / Male Idioma: En Revista: J Musculoskelet Neuronal Interact Asunto de la revista: FISIOLOGIA / NEUROLOGIA / ORTOPEDIA Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Grecia
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Escápula / Discinesias / Electromiografía Límite: Adult / Female / Humans / Male Idioma: En Revista: J Musculoskelet Neuronal Interact Asunto de la revista: FISIOLOGIA / NEUROLOGIA / ORTOPEDIA Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Grecia