A ROTAÇÃO DE OMBRO NÃO AFETA A ATIVAÇÃO MUSCULAR DO PEITORAL MAIOR E DELTOIDE ANTERIOR DURANTE O EXERCÍCIO PEC DECK

ResumoObjetivo: comparar a atividade mioelétrica do peitoral maior (PM) e deltoide anterior (DA) durante o exercício pec deck, em contração voluntária máxima isométrica (CVMI), em rotação interna (RI) e externa (RE) de ombro em diferentes posições articulares. Materiais e Métodos: dez homens saudáveis (idade: 30 ± 6,37 anos, massa corporal total: 84,6 ± 9,43 kg, estatura: 178,6 ± 5,60 cm), treinados em força (tempo de prática: 82,8 ± 63,35 meses), realizaram três CVMI’s durante cinco segundos, e intervalo de 15 segundos entre contrações no exercício pec deck tanto em RI, quanto em RE da articulação do ombro. Um intervalo de 10 minutos foi fornecido aos sujeitos entre condições experimentais em três diferentes posições articulares: máxima adução de ombros (0°), adução dos ombros a 45° e 90°. A atividade mioelétrica do PM e DA foi avaliada por meio de eletromiografia superficial. Resultados: não foram verificadas diferenças significantes entre as rotações de ombro para a ativação muscular em nenhuma das posições articulares analisadas para o DA (0°: d=0,89; Δ%=22,46; 45°: d= 0,65; Δ%=17,95 e 90°: d= 1,26; Δ%=21,16) e para o PM (0°: d= 0,18; Δ%=5,42; 45°: d=0,29; Δ%=10,08 e 90°: d=0,41; Δ%=16,24). Foi verificado aumento significante da ativação muscular do PM em RI na posição de 90° de abdução horizontal de ombro quando comparado a 45° (P<0,05 d=1,85; Δ%=47,00). Conclusão: a realização do exercício pec deck em RI e RE não altera a atividade muscular do PM e do DA, independentemente da posição articular realizada.Palavras-chave: força; eletromiografia; exercício. AbstractObjective: to compare the myoelectric activity of the pectoralis major (PM) and anterior deltoid (AD) during the pec deck exercise, in maximal isometric voluntary contraction (MIVC) in internal rotation (IR) and external (ER) rotation of the shoulder in different joint positions. Methods: ten healthy male (age: 30 ± 6.37 years, total body mass: 84.6 ± 9.43 kg, height: 178.6 ± 5.60 cm), trained in strength (time of practice: 82.8 ± 63.35 months) performed through three MIVC's for five seconds, and a 15-second interval between contractions in the pec deck exercise in both RI and ER of the shoulder joint. A 10-minute interval was provided to subjects between experimental conditions at three different joint positions: maximum shoulder adduction (0°), shoulder adduction at 45° and 90°. The myoelectric activity of the PM and anterior deltoid AD was evaluated by surface electromyography. Results: there were no significant differences between shoulder rotations for muscle activation in any of the joint positions analyzed for the AD (0°: d=0.89; Δ%=22.46; 45°: d= 0.65; Δ%=17.95 e 90°: d= 1.26; Δ%=21.16) and the PM (0°: d= 0.18; Δ%=5.42; 45°: d=0.29; Δ%=10.08 e 90°: d=0.41; Δ%=16.24). There was a significant increase in muscle activation of the PM in IR at the 90° horizontal abduction position of the shoulder when compared to 45° (P<0.05 d=1.85; Δ%=47.00). Conclusion: the performance of the pec deck exercise in IR and RE does not alter the muscular activity of the PM and the AD, independently of the joint position performed.Keywords: strength; electromyography; exercise. Figshare DOI: 10.6084/m9.figshare.1119571

Postural biomechanical risks for nursing workers

Introduction: In the hospital environment, several types of professionals must be involved in continuous working shifts, under working conditions that are often unsatisfactory. Objective: The objective of the present study was to analyze the biomechanical risk factors for work-related musculoskeletal disorders (WRMD). Material and methods: This was a cross-sectional, exploratory, descriptive and quantitative study and its analysis considered 15 workers, in three shifts. A questionnaire containing personal information and general data regarding the work environment was applied. The REBA protocol was used for posture assessment, once the workers were recorded while performing their activities. The results were presented descriptively. Results: In light of the results obtained, the working day was found excessive, particularly considering the weekly frequency and period of time of the working shifts. The REBA protocol showed that the positions adopted presented high risk for the development of WRMD in all nine activities evaluated. Conclusion: The nursing activities were characterized as stressful for the workers involved

Postural biomechanical risks for nursing workersRiscos biomecânicos posturais em trabalhadores de enfermagem

Introduction In the hospital environment, several types of professionals must be involved in continuous working shifts, under working conditions that are often unsatisfactory. Objective The objective of the present study was to analyze the biomechanical risk factors for work-related musculoskeletal disorders (WRMD). Material and methods This was a cross-sectional, exploratory, descriptive and quantitative study and its analysis considered 15 workers, in three shifts. A questionnaire containing personal information and general data regarding the work environment was applied. The REBA protocol was used for posture assessment, once the workers were recorded while performing their activities. The results were presented descriptively. Results In light of the results obtained, the working day was found excessive, particularly considering the weekly frequency and period of time of the working shifts. The REBA protocol showed that the positions adopted presented high risk for the development of WRMD in all nine activities evaluated. Conclusion The nursing activities were characterized as stressful for the workers involved