Análise longitudinal de músculos sóleos, de ratos, submetidos a alongamento passivo com uso prévio de ultrassom terapêutico

Bertolini, Gladson Ricardo Flor; Barbieri, Cláudio Henrique; Mazzer, Nílton

doi:10.1590/s1517-86922009000200006

Cited by 6 publications

(6 citation statements)

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“…These second messengers stimulate the proliferation of satellite cells, which d could make new fibers in case of death of the cell or would help in the repairing of a focal injury 9 . Bertolini et al 23 analyzed the effects of stretching and ultrasound associated or not, and verified that static passive stretching associated with therapeutic ultrasound of 0.5W/cm 2 produced alterations only in muscular length at rest, which was increased, corroborating the result of this study.…”

Section: Discussionsupporting

confidence: 84%

Efeitos do ultrassom terapêutico associados ao alongamento estático sobre parâmetros histomorfométricos longitudinais de sóleos imobilizados de ratos

Artifon

Ferrari

Cunha

et al. 2012

Rev Bras Med Esporte

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The muscle tissue is endowed with plasticity that adapts to different stimuli. Immobilization causes damage to the musculature including atrophy, loss of muscle strength and extensibility. The stretching and ultrasound treatment modalities are used to speed up muscle repair process as they can increase protein synthesis and improve extensibility. Objective: To compare the use of therapeutic thermal and non thermal ultrasound, associated with stretching, in the remobilization of the soleus muscle of rats subjected to position of muscle shortening on aspects histomorphometric longitudinal muscle. Methods: 28 rats were immobilized for 15 days, later released from the apparatus and divided into four groups: group AG only remobilized by stretching for 10 days and the others were subjected to 10 days of therapeutic intervention 1MHz of ultrasound at 1.0W/cm² (GAUS 1.0), 0.5W/cm² (GAUS 0.5), and 0.2 W/cm² (GAUS 0.2), and further stretching to the soleus. At the end of treatment, the animals were sacrificed and their soleus muscles were removed for later histological analysis of longitudinal parameters (count of sarcomeres). Results: At intragroup analysis on the muscle length, only the group GAUS 0.5 did not present significant difference. The count of sarcomeres in the groups GA and GAUS 0.2 was statistically different. The size of the sarcomeres in both groups had no statistically significant difference. In inter-group analysis both groups had no statistically significant difference for any of the variables. Conclusion: The stretching was insufficient to reverse the effects of immobilization. When associated with therapeutic ultrasound, the dose 0.5 W/cm² recovered muscle length significantly, and the doses 1.0 and 0.5 W/cm² contributed to the significant increase of the number of sarcomeres in immobilized muscles.

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Section: Discussionsupporting

confidence: 84%

Efeitos do ultrassom terapêutico associados ao alongamento estático sobre parâmetros histomorfométricos longitudinais de sóleos imobilizados de ratos

Artifon

Ferrari

Cunha

et al. 2012

Rev Bras Med Esporte

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“…To this end, the maximum dorsal flexion of the ankle joint was done manually with the knee extended, as described by Mattiello-Sverzut et al 12 The protocol was maintained for 30 s 13 during each repetition, with an interval of 30 s, four repetitions, 14 five times a week (from Monday to Friday). Stretching was initiated on the 10th day after the lesion.…”

Section: Methodsmentioning

confidence: 99%

Morphologic study of different treatments for gastrocnemius muscle contusion in rats

Macedo

Ywazaki

Macedo³

et al. 2016

Revista Brasileira de Ortopedia (English Edition)

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ObjectiveEvaluate the effects of ultrasound and stretching in morphology after rat muscle contusion.MethodsMale Wistar rats (n = 35, 8–9 weeks, 271 ± 14 g) were divided into five groups: control group (CG = 3); lesion group (LG = 8); lesion + ultrasound group (LUG = 8); lesion + stretching group (LSG = 8); lesion + ultrasound + stretching group (LUSG = 8). The ultrasound was applied in LUG and LUSG from the third to the seventh day, the dose used was 50% pulsed, 0.5 W/cm2, 5 min. From the tenth until the twenty first day, passive stretching was performed, in four repetitions lasting 30 s each with 30 s of rest. Initial and final body weight, muscle weight and length, number and sarcomere length, muscle fiber cross-sectional area, and percentage of collagen were evaluated after 22 days.ResultsThe final body weight was higher than the initial in all groups. The number of sarcomeres was statistically higher in LSG than LUG and higher in LUSG than LUS and CG; in sarcomere length was higher in LUG when compared with LSG (p < 0.05). The cross sectional area in LG was higher than LSG, and the percentage of collagen was higher in LG when compared with LSG and CG; in LUG when compared with LSG and CG; and in LUSG when compared with CG.ConclusionThe passive stretching protocol induced sarcomerogenesis and antifibrotic effect over the muscle submitted to contusion. Ultrasound, even in association with stretching, was not sufficient to prevent fibrosis in the injured muscle.

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“…Vários resultados sobre os efeitos de UST podem ser observados em modelos histológicos, e apresentam-se como uma importante ferramenta na avaliação do reparo tecidual [10][11][12][13][14] . Ainda, diferenças entre as fases de reparo tecidual e a própria qualidade do reparo podem ser funcionalmente evidenciadas por meio de ensaios mecânicos de materiais biológicos 15 .…”

Section: Introductionunclassified

Efeito do ultrassom terapêutico sobre as propriedades mecânicas do gastrocnêmio em ratos

Barbosa

Filho

Nonato

et al. 2014

Rev Bras Med Esporte

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INTRODUÇÃO: Apesar de algumas controvérsias quanto à sua utilização, o ultrassom terapêutico (UST) é um recurso comumente aplicado na reabilitação desportiva para aceleração do reparo tecidual de lesões musculares. Sabe-se que lesões musculares influenciam negativamente as propriedades mecânicas da musculatura estriada esquelética e algumas evidências demonstram que o UST poderia ter efeitos benéficos sobre o reparo muscular e, consequentemente, sobre suas propriedades mecânicas.OBJETIVO: Analisar o efeito do UST no reparo tecidual por meio das propriedades mecânicas musculares de ratos após trauma por criolesão.MÉTODOS: Foram utilizados no estudo 30 ratos da linhagem Wistar, os quais foram divididos em três grupos: grupo controle intacto (GC), grupo lesionado sem tratamento (GL), e grupo lesionado e estimulado com UST (frequência de 1 MHz; intensidade de 0,5 W/cm2; ciclo de trabalho de 50%; por quatro minutos diários), durante sete dias consecutivos (GLUST). As propriedades mecânicas obtidas através de ensaio mecânico de tração foram avaliadas em uma máquina universal de ensaios.RESULTADOS: Foram analisados estatisticamente, com nível de significância de 95% (P<0,05). Após sete sessões de tratamento, houve melhora estatisticamente significativa nas propriedades mecânicas de carga no limite de proporcionalidade, carga no limite máximo e resiliência para o GLUST em relação ao GL (p<0,05).CONCLUSÃO: O UST foi eficaz no processo de reparo tecidual, conferindo ao tecido muscular maior resistência à tração e absorção de energia.

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Análise longitudinal de músculos sóleos, de ratos, submetidos a alongamento passivo com uso prévio de ultrassom terapêutico

Cited by 6 publications

References 20 publications

Efeitos do ultrassom terapêutico associados ao alongamento estático sobre parâmetros histomorfométricos longitudinais de sóleos imobilizados de ratos

Efeitos do ultrassom terapêutico associados ao alongamento estático sobre parâmetros histomorfométricos longitudinais de sóleos imobilizados de ratos

Morphologic study of different treatments for gastrocnemius muscle contusion in rats

Efeito do ultrassom terapêutico sobre as propriedades mecânicas do gastrocnêmio em ratos

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