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Biased instantaneous regional muscle activation maps: Embedded fuzzy topology and image feature analysis.
De la Fuente, Carlos; Weinstein, Alejandro; Neira, Alejandro; Valencia, Oscar; Cruz-Montecinos, Carlos; Silvestre, Rony; Pincheira, Patricio A; Palma, Felipe; Carpes, Felipe P.
Afiliação
  • De la Fuente C; Carrera de Kinesiología, Departamento de Cs. de la Salud, Facultad de Medicina, Pontificia Universidad Católica, Santiago, Chile.
  • Weinstein A; Laboratory of Neuromechanics, Universidade Federal do Pampa, Campus Uruguaiana, Uruguaiana, Brazil.
  • Neira A; Unidad de Biomecánica, Centro de Innovación, Clínica MEDS, Santiago, Chile.
  • Valencia O; Centro de Investigación y Desarrollo en Ingeniería en Salud, Universidad de Valparaíso, Valparaíso, Chile.
  • Cruz-Montecinos C; Escuela de Kinesiología, Facultad de Ciencias, Universidad Mayor, Santiago, Chile.
  • Silvestre R; Laboratorio Integrativo de Biomecánica y Fisiología del Esfuerzo, Facultad de Medicina, Escuela de Kinesiología, Universidad de los Andes, Santiago, Chile.
  • Pincheira PA; Laboratory of Clinical Biomechanics, Department of Physical Therapy, Faculty of Medicine, Universidad de Chile, Santiago, Chile.
  • Palma F; Carrera de Kinesiología, Departamento de Cs. de la Salud, Facultad de Medicina, Pontificia Universidad Católica, Santiago, Chile.
  • Carpes FP; Unidad de Biomecánica, Centro de Innovación, Clínica MEDS, Santiago, Chile.
Front Bioeng Biotechnol ; 10: 934041, 2022.
Article em En | MEDLINE | ID: mdl-36619379
The instantaneous spatial representation of electrical propagation produced by muscle contraction may introduce bias in surface electromyographical (sEMG) activation maps. Here, we described the effect of instantaneous spatial representation (sEMG segmentation) on embedded fuzzy topological polyhedrons and image features extracted from sEMG activation maps. We analyzed 73,008 topographic sEMG activation maps from seven healthy participants (age 21.4 ± 1.5 years and body mass 74.5 ± 8.5 kg) who performed submaximal isometric plantar flexions with 64 surface electrodes placed over the medial gastrocnemius muscle. Window lengths of 50, 100, 150, 250, 500, and 1,000 ms and overlap of 0, 25, 50, 75, and 90% to change sEMG map generation were tested in a factorial design (grid search). The Shannon entropy and volume of global embedded tri-dimensional geometries (polyhedron projections), and the Shannon entropy, location of the center (LoC), and image moments of maps were analyzed. The polyhedron volume increased when the overlap was <25% and >75%. Entropy decreased when the overlap was <25% and >75% and when the window length was <100 ms and >500 ms. The LoC in the x-axis, entropy, and the histogram moments of maps showed effects for overlap (p < 0.001), while the LoC in the y-axis and entropy showed effects for both overlap and window length (p < 0.001). In conclusion, the instantaneous sEMG maps are first affected by outer parameters of the overlap, followed by the length of the window. Thus, choosing the window length and overlap parameters can introduce bias in sEMG activation maps, resulting in distorted regional muscle activation.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Front Bioeng Biotechnol Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Chile País de publicação: Suíça
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Front Bioeng Biotechnol Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Chile País de publicação: Suíça