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Universidade Estadual de Campinas

1. Silva, Daniela Cristina de Oliveira. Avaliação eletromiografica e força de musculos do membro superior em individuos submetidos a suplementação de creatina: Strenght and elctromyographic evaluation of upper limb muscles in men undergoing creatine supplementation.

Degree: 2009, Universidade Estadual de Campinas

Abstract: Surface electromyography is a potential tool for anatomic, clinic and kinesiologic studies of muscle electric activity and it has been employed to identify muscular activation levels associated with force and muscular fatigue. Creatine supplementation has been used to augment the strength and muscular efficiency as well to decrease the onset of muscular fatigue. This study aimed to analyze the force and electromyographic activity of biceps brachii (BB), brachioradialis (BR) and flexor carpi ulnaris (FCU) muscles in subjects submitted to acute and chronic creatine supplementation. Twenty resistance-trained male volunteers, aged 18 to 35 years, were selected for this double-blind, controlled-placebo, randomized study. Volunteers were placed into two groups: creatine (5 g creatine and 5 g maltodextrine, n=10) and placebo (5 g cellulose and 5g maltodextrine, n=10). Oral supplementation was given 4 times per day during the first 7days and once a day in the 49 subsequent days. Volunteers performed maximum isometric voluntary contraction (MIVC) of forearm flexion and with 30% and 60% MIVC, before and after 7 and 56 days of supplementation. Electromyographic signs were captured using passive surface electrodes joined to a pre-amplifier, recorded in a computer-connected electromyography and analyzed by the Myosystem-Br1 software. A load cell was used to measure the maximum isometric strength during the tests. Electromyographic data were calculated by values of amplitude (RMS - root mean square) and median frequency (MF) and analyzed by linear regression curve, generating RMS and MF slopes that were considered muscular efficiency and fatigue indices, respectively. Results showed that creatine group exhibited an increase of strength only after 56 days of supplementation (p < 0.05), while no significant difference was found in placebo group. BB and BR muscles showed a decrease of RMS slopes after 7 and 56 days of creatine supplementation with 60% MIVC (p < 0.05). No significant difference was observed in MF slopes among times of supplementation for all muscles in both loads and groups. It can be concluded that the chronic creatine supplementation increases the isometric strength of forearm flexion. Also, both acute and chronic creatine supplementation improve the BB and BR muscular efficiency only with high loads, but do not have beneficial effect on reducing muscular fatigue of BB, BR and FCU, whichever the load Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Bérzin, Fausto, 1940- (advisor), Universidade Estadual de Campinas. Faculdade de Odontologia de Piracicaba (institution), Programa de Pós-Graduação em Biologia Buco-Dental (nameofprogram), Souza, Gilmar da Cunha (committee member), Filho, Ruben de Faria Negrão (committee member), Pedroni, Cristiane Rodrigues (committee member), Nagae, Mirian Hideko (committee member).

Subjects/Keywords: Eletromiografia; Suplemento ergogenico; Flexão do antebraço; Electromyography; Ergogenic aid; Forearm flexion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Silva, D. C. d. O. (2009). Avaliação eletromiografica e força de musculos do membro superior em individuos submetidos a suplementação de creatina: Strenght and elctromyographic evaluation of upper limb muscles in men undergoing creatine supplementation. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/290900

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Silva, Daniela Cristina de Oliveira. “Avaliação eletromiografica e força de musculos do membro superior em individuos submetidos a suplementação de creatina: Strenght and elctromyographic evaluation of upper limb muscles in men undergoing creatine supplementation.” 2009. Thesis, Universidade Estadual de Campinas. Accessed January 22, 2021. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290900.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Silva, Daniela Cristina de Oliveira. “Avaliação eletromiografica e força de musculos do membro superior em individuos submetidos a suplementação de creatina: Strenght and elctromyographic evaluation of upper limb muscles in men undergoing creatine supplementation.” 2009. Web. 22 Jan 2021.

Vancouver:

Silva DCdO. Avaliação eletromiografica e força de musculos do membro superior em individuos submetidos a suplementação de creatina: Strenght and elctromyographic evaluation of upper limb muscles in men undergoing creatine supplementation. [Internet] [Thesis]. Universidade Estadual de Campinas; 2009. [cited 2021 Jan 22]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/290900.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Silva DCdO. Avaliação eletromiografica e força de musculos do membro superior em individuos submetidos a suplementação de creatina: Strenght and elctromyographic evaluation of upper limb muscles in men undergoing creatine supplementation. [Thesis]. Universidade Estadual de Campinas; 2009. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/290900

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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