Muscle Atrophy, Voluntary Activation Disturbances, and Low Serum Concentrations of IGF-1 and IGFBP-3 Are Associated With Weakness in People With Chronic Stroke.

Autor:	de Abreu Silva-Couto, Marcela, Lanatovitz Prado-Medeiros, Christiane, Oliveira, Ana Beatriz, Alcântara, Carolina Carmona, Teixeira Guimarães, Araci, de Fatima Salvini, Tania, Mattioli, Rosana, de Russo, Thiago Luiz
Předmět:	CARRIER proteins COMPARATIVE studies CONFIDENCE intervals STATISTICAL correlation ELECTROMYOGRAPHY ENZYME-linked immunosorbent assay EXERCISE tests HEALTH status indicators HEALTH surveys HEMIPLEGIA MAGNETIC resonance imaging MUSCLE contraction MUSCULAR atrophy PROBABILITY theory QUALITY of life QUESTIONNAIRES SOMATOMEDIN STATISTICS STROKE T-test (Statistics) TORQUE U-statistics DATA analysis ACTIVITIES of daily living BODY mass index CROSS-sectional method DATA analysis software DESCRIPTIVE statistics MUSCLE weakness DISEASE complications DIAGNOSIS
Zdroj:	Physical Therapy; Jul2014, Vol. 94 Issue 7, p957-967, 11p, 1 Diagram, 2 Charts, 3 Graphs
Abstrakt:	Background. The muscle weakness that is exhibited poststroke is due to a multifactorial etiology involving the central nervous system and skeletal muscle changes. Insulinlike growth factor 1 (IGF-1) and IGF binding protein 3 (IGFBP-3) have been described as biomarkers of neuromuscular performance in many conditions. However, no information about these biomarkers is available for people with chronic hemiparesis. Objective. The purpose of this study was to investigate possible factors involved in muscle weakness, such as IGF-1 and IGFBP-3 serum concentrations, muscle volume, and neuromuscular performance of the knee flexors and extensors, in people with chronic hemiparesis poststroke. Design. This was a cross-sectional study. Methods. A cross-sectional study was performed on 14 individuals poststroke who were paired with healthy controls. Mobility, function, balance, and quality of life were recorded as outcome measures. Knee flexor and extensor muscle volumes and neuromuscular performance were measured using nuclear magnetic resonance imaging, dynamometry, and electromyography. The serum concentrations of IGF-1 and IGFBP-3 were quantified by enzyme-linked immunosorbent assay (ELISA). Results. The hemiparetic group had low serum concentrations of IGF-1 (25%) and IGFBP-3 (40%); reduced muscle volume in the vastus medialis (32%), vastus intermedius (29%), biceps femoris (16%), and semitendinosus and semimembranosus (12%) muscles; reduced peak torque, power, and work of the knee flexors and extensors; and altered agonist and antagonist muscle activation compared with controls. Conclusions. Low serum concentrations of IGF-1 and IGFBP-3, deficits in neuromuscular performance, selective muscle atrophy, and decreased agonist muscle activation were found in the group with chronic hemiparesis poststroke. Both hemorrhagic and ischemic stroke were considered, and the data reflect a chronic poststroke population with good function. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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