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Isokinetic and electromyographic characterization of ankle plantarflexors' hypertonia in people with multiple sclerosis.
Boi, Anna; Ventura, Lucia; Martinez, Gianluca; Morrone, Marco; Aiello, Elena; Deriu, Franca; Manca, Andrea.
Afiliación
  • Boi A; Department of Biomedical Sciences, University of Sassari, Sassari, Italy.
  • Ventura L; Department of Biomedical Sciences, University of Sassari, Sassari, Italy.
  • Martinez G; Department of Biomedical Sciences, University of Sassari, Sassari, Italy.
  • Morrone M; Department of Biomedical Sciences, University of Sassari, Sassari, Italy.
  • Aiello E; Department of Medicine, Surgery and Pharmacy, University of Sassari, Sassari, Italy.
  • Deriu F; Department of Biomedical Sciences, University of Sassari, Sassari, Italy; Unit of Endocrinology, Nutrition, and Metabolic Disorders, AOUSS, Sassari, Italy. Electronic address: deriuf@uniss.it.
  • Manca A; Department of Biomedical Sciences, University of Sassari, Sassari, Italy.
Mult Scler Relat Disord ; 91: 105855, 2024 Aug 29.
Article en En | MEDLINE | ID: mdl-39236648
ABSTRACT

BACKGROUND:

This study aimed at quantifying ankle plantarflexors' resistance to passive motion (RPM) by isokinetic dynamometry and muscle activity through surface electromyography (sEMG) in persons with multiple sclerosis (PwMS) with limb stiffness and spasticity.

METHODS:

Slow and fast ankle dorsiflexions (from 5°/s to 210°/s) were imparted passively by an isokinetic dynamometer, and sEMG activity of plantarflexors was recorded at the same time as the square root of the moving average. Based on RPM evaluated at 5°/s, ankles were classified as more- and less-resistant as measured by average peak torque (APT).

RESULTS:

Measurements were obtained bilaterally from 24 PwMS (median EDSS 5.5) with median Modified Ashworth Scale (MAS) score of 1.75. Compared to the lowest velocity inducing EMG-evident responses (120°/s), RPM increased significantly at 180°/s (+137.8 %; p < 0.0005) and 210°/s (+85.3 %; p < 0.0005) in the less-resistant side, and only at 210°/s (+113.8 %; p < 0.0005) in the more-resistant side. sEMG activity increased significantly and similarly between limbs at increasing velocities. Significant velocity-dependent increases were detected in both limbs, with no difference by side, at 180°/s (+34.5 %; p = 0.005) and 210°/s (+48.4 %; p = 0.004). Regression analyses confirmed side (ß=0.542; p < 0.0001) and speed (ß=0.238; p < 0.0001) as significant predictors of APT change, but only speed for sEMG (speed ß=0.215; p = 0.019; side ß=0.012; p = 0.893). Bivariate correlations revealed that RPM was associated negatively with MAS and positively with sEMG.

CONCLUSION:

Spasticity presented bilaterally in PwMS, with different mixed pictures of passive and reflex stiffness, both requiring attention. Combining isokinetics and sEMG allows detecting even subtle, subclinical alterations that can prompt and drive early tailored management.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Mult Scler Relat Disord Año: 2024 Tipo del documento: Article País de afiliación: Italia Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Mult Scler Relat Disord Año: 2024 Tipo del documento: Article País de afiliación: Italia Pais de publicación: Países Bajos