O efeito da contração muscular de membros superiores sobre o sistema nervoso autonômico de pessoas com fatores de risco cardiovascular

• Autor(a) principal: Rodrigues, Pedro Henrique [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/139427; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/11-05-2016/000863096.pdf
• topic: Physical education and training; Educação fisica; Aptidão física; Batimento cardíaco; Sistema cardiovascular - Doenças; Membros superiores; Sistema nervoso autonomo

Background: The risk factors for cardiovascular disease are strongly associated with changes in the autonomic nervous system, which can compromise the cardiocirculatory adjustments to physical exercise. Objective: To investigate the autonomic modulation and HR to the stimulus of a maximum strength test in individuals with risk factors for cardiovascular disease. Methods: The sample consisted of 16 subjects (7 men and 9 women) aged 50 to 70 years who had at least one cardiovascular risk factors. Laboratory tests, anamnesis and anthropometric measurements were performed. At rest, HR and RR intervals (R-Ri) were analyzed in the time domain (RRi, SDNN, RMSSD), frequency (LF, HF, LF / HF) and the Poincaré plot (SD1, SD2, SD1 / SD2). The individuals were submitted to physical exercise on bench press machine and recorded the values of HR and iR-R in times: pre-exercise rest, effort and recovery. From these data we obtained the absolute values of HR and RRi of each time (rest, effort and recovery) and calculated indexes of heart rate variability (HRV) SD1 and RMSSD obtained at rest pre-exercise and during post-exercise recovery. It was also calculated HR variation in restexercise and exercise-recovery transitions. Results: RRi = 879 ± 153 ms; SDNN = 25,15 ± 9,5 ms; RMSSD = 18,9 ± 12,3 ms; LF (ms2) = 177,5 ± 149,1; HF (ms2) = 144,1 ± 149; LF (nu) = 57,8 ± 20,2; HF (nu) = 39,8 ± 19,5; LF/HF = 2,1 ± 1,7; SD1 = 13,4 ± 8,7 ms; SD2 = 32,5 ± 11,3 ms; SD1/SD2 = 0,307 ± 0,164. There was increase in HR (20.6 ± 8.9 bpm, representing 26.11 ± 9.8% of HR reserve) by muscular contraction stimulus and recovery to baseline levels in 30.5 ± 17 seconds post effort, indicating rapid reactivation of parasympathetic modulation. There was a correlation between the HR variation in rest/exercise and the rest HRV indexes SDNN (R = 0.766), RMSSD (R = 0.721), HF (ms²) (R = 0.533) SD1 (R = 0.720) and SD2 (R = 0.723) as well as on HR variation in exercise/first...