Interpreting principal components in biomechanics: representative extremes and single component reconstruction.
J Electromyogr Kinesiol
; 23(6): 1304-10, 2013 Dec.
Article
en En
| MEDLINE
| ID: mdl-24209874
ABSTRACT
Principal component analysis is a powerful tool in biomechanics for reducing complex multivariate datasets to a subset of important parameters. However, interpreting the biomechanical meaning of these parameters can be a subjective process. Biomechanical interpretations that are based on visual inspection of extreme 5th and 95th percentile waveforms may be confounded when extreme waveforms express more than one biomechanical feature. This study compares interpretation of principal components using representative extremes with a recently developed method, called single component reconstruction, which provides an uncontaminated visualization of each individual biomechanical feature. Example datasets from knee joint moments, lateral gastrocnemius EMG, and lumbar spine kinematics are used to demonstrate that the representative extremes method and single component reconstruction can yield equivalent interpretations of principal components. However, single component reconstruction interpretation cannot be contaminated by other components, which may enhance the use and understanding of principal component analysis within the biomechanics community.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Procesamiento de Imagen Asistido por Computador
/
Interpretación Estadística de Datos
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Músculo Esquelético
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Análisis de Componente Principal
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Electromiografía
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Articulación de la Rodilla
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Vértebras Lumbares
Tipo de estudio:
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
J Electromyogr Kinesiol
Asunto de la revista:
FISIOLOGIA
Año:
2013
Tipo del documento:
Article