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The acute effects of action observation on muscle strength/weakness and corticospinal excitability in older adults.
Harmon, Kylie K; Girts, Ryan M; Pagan, Jason I; Rodriguez, Gabriela; Stock, Matt S.
Afiliación
  • Harmon KK; Neuromuscular Plasticity Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, FL, USA.
  • Girts RM; School of Kinesiology and Physical Therapy, University of Central Florida, 12805 Pegasus Drive, HS 1-Room 258, Orlando, FL, 32816-2205, USA.
  • Pagan JI; Neuromuscular Plasticity Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, FL, USA.
  • Rodriguez G; School of Kinesiology and Physical Therapy, University of Central Florida, 12805 Pegasus Drive, HS 1-Room 258, Orlando, FL, 32816-2205, USA.
  • Stock MS; Neuromuscular Plasticity Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, FL, USA.
Exp Brain Res ; 240(6): 1801-1810, 2022 Jun.
Article en En | MEDLINE | ID: mdl-35488129
Muscle weakness is a critical problem facing many older adults. Interventions targeting nervous system plasticity may show promise in enhancing strength. The purpose of this study was to examine the acute effects of action observation on muscular strength characteristics and corticospinal excitability in older adults. Isometric wrist flexion strength characteristics and corticospinal excitability of the first dorsal interosseous (FDI) were measured in 14 older adults (mean age = 73 years) in response to observation of (1) STRONG contractions of the hand/wrist, (2) WEAK contractions of the hand/wrist, and (3) a CONTROL condition. Results from repeated measures analyses of variance (ANOVAs) indicated that rate of torque development at 200 ms (RTD200) significantly decreased from PRE to POST observation for CONTROL and WEAK, but not STRONG. No other ANOVAs were significant. However, effect sizes indicated that maximal voluntary contraction (MVC) peak torque showed moderate declines following WEAK (d = - 0.571) and CONTROL (d = - 0.636), but not STRONG (d = 0.024). Similarly, rate of torque development at 30 (RTD30), 50 (RTD50), and 200 (RTD200) ms showed large declines from PRE to POST after WEAK and CONTROL, but small changes following STRONG. FDI motor-evoked potential (MEP) amplitude tended to increase over time, but these results were variable. There was a pronounced effect from PRE to 8MIN (d = 0.954) during all conditions. Action observation of strong contractions may exert a preservatory effect on muscular strength. More work is needed to determine whether this is modulated by increased corticospinal excitability. The study was prospectively registered (ClinicalTrials.gov Identifier: NCT03946709).
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Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Tractos Piramidales / Contracción Isométrica Tipo de estudio: Prognostic_studies Límite: Aged / Humans Idioma: En Revista: Exp Brain Res Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Tractos Piramidales / Contracción Isométrica Tipo de estudio: Prognostic_studies Límite: Aged / Humans Idioma: En Revista: Exp Brain Res Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos