Electrically stimulated eccentric contraction training enhances muscle mass, function, and size following volumetric muscle loss.
J Orthop Res
; 41(12): 2588-2598, 2023 12.
Article
em En
| MEDLINE
| ID: mdl-37132367
ABSTRACT
Volumetric muscle loss (VML) overwhelms muscle's innate capacity for repair and can lead to permanent disability. The standard of care for VML injuries includes physical therapy, which can improve muscle function. The objective of this study was to develop and evaluate a rehabilitative therapy using electrically stimulated eccentric contraction training (EST) and determine the structural, biomolecular, and functional response of the VML-injured muscle. This study implemented EST using three different frequencies (50, 100, and 150 Hz) in VML-injured rats starting at 2 weeks postinjury. Four weeks of EST at 150 Hz showed a progressive increase in eccentric torque with an improvement in muscle mass (~39%), myofiber cross-sectional area, and peak isometric torque (~37.5%) relative to the untrained VML-injured sham group. EST at 150 Hz group also increased the number of large type 2B fibers (>5000 µm2 ). Elevated gene expression of markers associated with angiogenesis, myogenesis, neurogenesis, and an anti-inflammatory response was also observed. These results suggest that VML-injured muscles can respond and adapt to eccentric loading. The results of this study may aid in developing physical therapy regimens for traumatized muscles.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Músculo Esquelético
/
Doenças Musculares
Limite:
Animals
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article