Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function

Detalhes bibliográficos
Autor(a) principal: Giaretta,Vania Maria de Araújo
Data de Publicação: 2015
Outros Autores: Santos,Luiz Prudêncio, Barbosa,Ana Maria, Hyslop,Stephen, Corrado,Alexandre Pinto, Nicolau,Renata Amadei, Cogo,José Carlos
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Research on Biomedical Engineering (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2446-47402015000300241
Resumo: Introduction:Low-level laser therapy (LLLT) is effective in preventing fatigue and in stimulating the microcirculation and cellular activity. In this study, we examined the effect of LLLT on injured tibial muscle in vivo by assessing muscle function during fatigue.MethodsTwenty-four male mice were used. Each mouse received an injection of sterile 0.9% saline solution (50 µL) in the right tibialis anterior muscle, after which the tendon of the muscle was exposed, connected to an isometric transducer and subjected to a resting tension of 1 g. A bipolar electrode was attached to the tibial nerve for electrical stimulation. The mice were randomly allocated to one of two groups: G1 (control: 3 h – n=8 and 9 h – n=5) and G2 (treated with GaAlAs laser, λ660 nm, 35 mW, 0.6 J, 17 s: 3 h – n=6 and 9 h – n=5).ResultsIn G1 mice, the amplitude of the tetanic contracture in response to induced fatigue remained unchanged during six consecutive tetani. The amplitude of the tetanic contractions in response to electrical stimulation (4-8 mV) was also unchanged. These results indicated muscle intactness in response to the load imposed by tetanus. In G2 mice, there was an increase in the amplitude of contraction after 3 h and 9 h when compared to G1 at 83% tetanus.ConclusionThese results indicate that exposure of muscle to LLLT enhanced the contractile force and increased the resistance to muscle fatigue without causing morphological damage to cellular structures.
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spelling Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle functionLow-level laser therapyMuscle activityMuscle fatigueTetanusIntroduction:Low-level laser therapy (LLLT) is effective in preventing fatigue and in stimulating the microcirculation and cellular activity. In this study, we examined the effect of LLLT on injured tibial muscle in vivo by assessing muscle function during fatigue.MethodsTwenty-four male mice were used. Each mouse received an injection of sterile 0.9% saline solution (50 µL) in the right tibialis anterior muscle, after which the tendon of the muscle was exposed, connected to an isometric transducer and subjected to a resting tension of 1 g. A bipolar electrode was attached to the tibial nerve for electrical stimulation. The mice were randomly allocated to one of two groups: G1 (control: 3 h – n=8 and 9 h – n=5) and G2 (treated with GaAlAs laser, λ660 nm, 35 mW, 0.6 J, 17 s: 3 h – n=6 and 9 h – n=5).ResultsIn G1 mice, the amplitude of the tetanic contracture in response to induced fatigue remained unchanged during six consecutive tetani. The amplitude of the tetanic contractions in response to electrical stimulation (4-8 mV) was also unchanged. These results indicated muscle intactness in response to the load imposed by tetanus. In G2 mice, there was an increase in the amplitude of contraction after 3 h and 9 h when compared to G1 at 83% tetanus.ConclusionThese results indicate that exposure of muscle to LLLT enhanced the contractile force and increased the resistance to muscle fatigue without causing morphological damage to cellular structures.Sociedade Brasileira de Engenharia Biomédica2015-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2446-47402015000300241Research on Biomedical Engineering v.31 n.3 2015reponame:Research on Biomedical Engineering (Online)instname:Sociedade Brasileira de Engenharia Biomédica (SBEB)instacron:SBEB10.1590/2446-4740.0736info:eu-repo/semantics/openAccessGiaretta,Vania Maria de AraújoSantos,Luiz PrudêncioBarbosa,Ana MariaHyslop,StephenCorrado,Alexandre PintoNicolau,Renata AmadeiCogo,José Carloseng2015-10-20T00:00:00Zoai:scielo:S2446-47402015000300241Revistahttp://www.rbejournal.org/https://old.scielo.br/oai/scielo-oai.php||rbe@rbejournal.org2446-47402446-4732opendoar:2015-10-20T00:00Research on Biomedical Engineering (Online) - Sociedade Brasileira de Engenharia Biomédica (SBEB)false
dc.title.none.fl_str_mv Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function
title Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function
spellingShingle Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function
Giaretta,Vania Maria de Araújo
Low-level laser therapy
Muscle activity
Muscle fatigue
Tetanus
title_short Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function
title_full Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function
title_fullStr Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function
title_full_unstemmed Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function
title_sort Effect of low-level laser therapy (GaAlAs - λ660 nm) on muscle function
author Giaretta,Vania Maria de Araújo
author_facet Giaretta,Vania Maria de Araújo
Santos,Luiz Prudêncio
Barbosa,Ana Maria
Hyslop,Stephen
Corrado,Alexandre Pinto
Nicolau,Renata Amadei
Cogo,José Carlos
author_role author
author2 Santos,Luiz Prudêncio
Barbosa,Ana Maria
Hyslop,Stephen
Corrado,Alexandre Pinto
Nicolau,Renata Amadei
Cogo,José Carlos
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Giaretta,Vania Maria de Araújo
Santos,Luiz Prudêncio
Barbosa,Ana Maria
Hyslop,Stephen
Corrado,Alexandre Pinto
Nicolau,Renata Amadei
Cogo,José Carlos
dc.subject.por.fl_str_mv Low-level laser therapy
Muscle activity
Muscle fatigue
Tetanus
topic Low-level laser therapy
Muscle activity
Muscle fatigue
Tetanus
description Introduction:Low-level laser therapy (LLLT) is effective in preventing fatigue and in stimulating the microcirculation and cellular activity. In this study, we examined the effect of LLLT on injured tibial muscle in vivo by assessing muscle function during fatigue.MethodsTwenty-four male mice were used. Each mouse received an injection of sterile 0.9% saline solution (50 µL) in the right tibialis anterior muscle, after which the tendon of the muscle was exposed, connected to an isometric transducer and subjected to a resting tension of 1 g. A bipolar electrode was attached to the tibial nerve for electrical stimulation. The mice were randomly allocated to one of two groups: G1 (control: 3 h – n=8 and 9 h – n=5) and G2 (treated with GaAlAs laser, λ660 nm, 35 mW, 0.6 J, 17 s: 3 h – n=6 and 9 h – n=5).ResultsIn G1 mice, the amplitude of the tetanic contracture in response to induced fatigue remained unchanged during six consecutive tetani. The amplitude of the tetanic contractions in response to electrical stimulation (4-8 mV) was also unchanged. These results indicated muscle intactness in response to the load imposed by tetanus. In G2 mice, there was an increase in the amplitude of contraction after 3 h and 9 h when compared to G1 at 83% tetanus.ConclusionThese results indicate that exposure of muscle to LLLT enhanced the contractile force and increased the resistance to muscle fatigue without causing morphological damage to cellular structures.
publishDate 2015
dc.date.none.fl_str_mv 2015-09-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2446-47402015000300241
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2446-47402015000300241
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/2446-4740.0736
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Engenharia Biomédica
publisher.none.fl_str_mv Sociedade Brasileira de Engenharia Biomédica
dc.source.none.fl_str_mv Research on Biomedical Engineering v.31 n.3 2015
reponame:Research on Biomedical Engineering (Online)
instname:Sociedade Brasileira de Engenharia Biomédica (SBEB)
instacron:SBEB
instname_str Sociedade Brasileira de Engenharia Biomédica (SBEB)
instacron_str SBEB
institution SBEB
reponame_str Research on Biomedical Engineering (Online)
collection Research on Biomedical Engineering (Online)
repository.name.fl_str_mv Research on Biomedical Engineering (Online) - Sociedade Brasileira de Engenharia Biomédica (SBEB)
repository.mail.fl_str_mv ||rbe@rbejournal.org
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