Effects of GaAs laser and stretching on muscle contusion in rats
ABSTRACT Laser and stretching are used to treat skeletal muscle injuries. This study aimed to evaluate the effects of GaAs laser and stretching in the morphology of the tibialis anterior (TA) muscle after contusion. Thirty-six male rats (349±23g) were divided into six groups (n=6): control group (CG...
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| Format: | Article |
| Language: | English |
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Universidade de São Paulo
2016-03-01
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| Series: | Fisioterapia e Pesquisa |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1809-29502016000100003&tlng=en |
| _version_ | 1798013891646586880 |
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| author | Daniela Gallon Corrêa Juliana T. Okita Hilana Rickli Fiuza Martins Anna Raquel Silveira Gomes |
| author_facet | Daniela Gallon Corrêa Juliana T. Okita Hilana Rickli Fiuza Martins Anna Raquel Silveira Gomes |
| author_sort | Daniela Gallon Corrêa |
| collection | DOAJ |
| description | ABSTRACT Laser and stretching are used to treat skeletal muscle injuries. This study aimed to evaluate the effects of GaAs laser and stretching in the morphology of the tibialis anterior (TA) muscle after contusion. Thirty-six male rats (349±23g) were divided into six groups (n=6): control group (CG); lesion group (LG); lesion and laser group (LLG); lesion and stretching group (LSG); lesion, laser and stretching group (LLSG); and stretching group (SG). TA was wounded by a contusion apparatus. We used GaAs laser 4.5 J/cm2 dose for 32 s each, beginning 48 h after lesion, for 7 days, once a day. Manual passive stretching was applied by 10 repetitions for 1 minute, initiating on the 8th day, once a day, 3 times a week, during 3 weeks. After 4 weeks, rats were euthanized and we analyzed: muscle weight and length, cross sectional area of muscle fibers (CSAMF), serial sarcomere number (SSN), sarcomere length, and percentage of connective tissue. Comparisons among groups were made by ANOVA and post hoc Tukey tests, with the significance level set at ≤ 0.05. The serial sarcomere number of LLSG was higher than LSG. The sarcomere length of LSG was superior to LLG, LLSG, and SG. SG increased SSN compared to CG, while the percentage of connective tissue of SG decreased in comparison to LLSG. Thus, the sarcomerogenesis of injured muscles was enhanced by laser therapy, stretching, and association of both. The stretching protocol was enough to increase SSN of intact muscles. |
| first_indexed | 2024-04-11T15:09:46Z |
| format | Article |
| id | doaj.art-c310c26b80754864901345f1651140f6 |
| institution | Directory Open Access Journal |
| issn | 2316-9117 |
| language | English |
| last_indexed | 2024-04-11T15:09:46Z |
| publishDate | 2016-03-01 |
| publisher | Universidade de São Paulo |
| record_format | Article |
| series | Fisioterapia e Pesquisa |
| spelling | doaj.art-c310c26b80754864901345f1651140f62022-12-22T04:16:42ZengUniversidade de São PauloFisioterapia e Pesquisa2316-91172016-03-0123131110.1590/1809-2950/13903823012016Effects of GaAs laser and stretching on muscle contusion in ratsDaniela Gallon CorrêaJuliana T. OkitaHilana Rickli Fiuza MartinsAnna Raquel Silveira GomesABSTRACT Laser and stretching are used to treat skeletal muscle injuries. This study aimed to evaluate the effects of GaAs laser and stretching in the morphology of the tibialis anterior (TA) muscle after contusion. Thirty-six male rats (349±23g) were divided into six groups (n=6): control group (CG); lesion group (LG); lesion and laser group (LLG); lesion and stretching group (LSG); lesion, laser and stretching group (LLSG); and stretching group (SG). TA was wounded by a contusion apparatus. We used GaAs laser 4.5 J/cm2 dose for 32 s each, beginning 48 h after lesion, for 7 days, once a day. Manual passive stretching was applied by 10 repetitions for 1 minute, initiating on the 8th day, once a day, 3 times a week, during 3 weeks. After 4 weeks, rats were euthanized and we analyzed: muscle weight and length, cross sectional area of muscle fibers (CSAMF), serial sarcomere number (SSN), sarcomere length, and percentage of connective tissue. Comparisons among groups were made by ANOVA and post hoc Tukey tests, with the significance level set at ≤ 0.05. The serial sarcomere number of LLSG was higher than LSG. The sarcomere length of LSG was superior to LLG, LLSG, and SG. SG increased SSN compared to CG, while the percentage of connective tissue of SG decreased in comparison to LLSG. Thus, the sarcomerogenesis of injured muscles was enhanced by laser therapy, stretching, and association of both. The stretching protocol was enough to increase SSN of intact muscles.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1809-29502016000100003&tlng=enSkeletal MuscleMuscle Stretching ExercisesWounds and InjuriesLow-Level Light TherapyRats |
| spellingShingle | Daniela Gallon Corrêa Juliana T. Okita Hilana Rickli Fiuza Martins Anna Raquel Silveira Gomes Effects of GaAs laser and stretching on muscle contusion in rats Fisioterapia e Pesquisa Skeletal Muscle Muscle Stretching Exercises Wounds and Injuries Low-Level Light Therapy Rats |
| title | Effects of GaAs laser and stretching on muscle contusion in rats |
| title_full | Effects of GaAs laser and stretching on muscle contusion in rats |
| title_fullStr | Effects of GaAs laser and stretching on muscle contusion in rats |
| title_full_unstemmed | Effects of GaAs laser and stretching on muscle contusion in rats |
| title_short | Effects of GaAs laser and stretching on muscle contusion in rats |
| title_sort | effects of gaas laser and stretching on muscle contusion in rats |
| topic | Skeletal Muscle Muscle Stretching Exercises Wounds and Injuries Low-Level Light Therapy Rats |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1809-29502016000100003&tlng=en |
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