Avaliação das variáveis hemodinâmicas em testes isométricos máximos no leg press 45º e no dinamômetro de preensão palmar (handgrip) em adultos-jovens treinados

• Ano de defesa: 2019
• Autor(a) principal: Soares, Brande Ranter Alves
• Orientador(a): Moraes, Milton Rocha de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Católica de Brasília
• Programa de Pós-Graduação: Programa Stricto Sensu em Educação Física
• Departamento: Escola de Saúde e Medicina
• País: Brasil
• Palavras-chave em Português: Isométrico; Força muscular; Pressão arterial; Frequência cardíaca
• Palavras-chave em Inglês: Muscular strength; Blood pressure; Heart rate; Isometric
• Área do conhecimento CNPq: CNPQ::CIENCIAS DA SAUDE::EDUCACAO FISICA
• Resumo em Inglês: The acute hemodynamic changes during the submaximal isometric exercise sessions are well studied. However, little is known about hemodynamic changes in maximal isometric tests that precede training protocols or exercise sessions. In addition, there is a gap in the literature on the behavior of cardiovascular variables induced by maximal isometric tests of large muscle groups. Therefore, the objective of the study was to evaluate the cardiovascular responses in trained young subjects submitted to the test of maximum voluntary isometric contraction (CVIM) in physical exercises with the action of different sizes of muscular mass. There were Thirtyseven men, with experience in strength training (4 ± 2 years of training), age (25 ± 4 years), body mass index (24 ± 5 kg.m-2). Those participants performed two CVIM tests: i) isometric handgrip (IHG) and ii) isometric leg press 45º (ILP45º). Three attempts of CVIM were made with 5 seconds of contraction and 3 minutes of pause between each attempt. The CVIM in the IHG was performed in a manual hydraulic dynamometer (Jamar, IL, USA). A conventional bodybuilding device (Righetto, Campinas, Brazil) was used with the cell load (Power Dinpro ®, CEFISE, Brazil) coupled to the device for the test of CVIM in the ILP45º. Systolic blood pressure (SBP), diastolic blood pressure (DBP), and heart rate (HR) were measured at rest, immediately after the retest, and at 5 and 10 minutes using the oscillometric method (Microlife, 3BPAC-1, Switzerland) and a heart rate monitor (Polar®, model RS800cx, Finland), respectively. The mean arterial pressure (MAP), the double product (RPP) and the pulse pressure (PP) were calculated by means of mathematical equations. The evaluation of the area under the curve (AUC) of the CVIM tests showed a significant increase for the HR (AUC, p = 0.0004) and RPP (AUC, p = 0.0032) for the ILP45o when compared to the IHG. Significant increases for SBP and MAP also occurred at the end of the third trial for the ILP45o test compared to the IHG. However, at the end of each trial no significant differences were found for DBP and PP between the protocols (IHG vs. ILP45o). Our findings demonstrate that in young people with experience in strength training who underwent CVIM test involving large muscle mass (ILP45o), HR and RPP may be better markers than blood pressure to measure cardiovascular responsiveness.
• Link de acesso: https://bdtd.ucb.br:8443/jspui/handle/tede/2595

The acute hemodynamic changes during the submaximal isometric exercise sessions are well studied. However, little is known about hemodynamic changes in maximal isometric tests that precede training protocols or exercise sessions. In addition, there is a gap in the literature on the behavior of cardiovascular variables induced by maximal isometric tests of large muscle groups. Therefore, the objective of the study was to evaluate the cardiovascular responses in trained young subjects submitted to the test of maximum voluntary isometric contraction (CVIM) in physical exercises with the action of different sizes of muscular mass. There were Thirtyseven men, with experience in strength training (4 ± 2 years of training), age (25 ± 4 years), body mass index (24 ± 5 kg.m-2). Those participants performed two CVIM tests: i) isometric handgrip (IHG) and ii) isometric leg press 45º (ILP45º). Three attempts of CVIM were made with 5 seconds of contraction and 3 minutes of pause between each attempt. The CVIM in the IHG was performed in a manual hydraulic dynamometer (Jamar, IL, USA). A conventional bodybuilding device (Righetto, Campinas, Brazil) was used with the cell load (Power Dinpro ®, CEFISE, Brazil) coupled to the device for the test of CVIM in the ILP45º. Systolic blood pressure (SBP), diastolic blood pressure (DBP), and heart rate (HR) were measured at rest, immediately after the retest, and at 5 and 10 minutes using the oscillometric method (Microlife, 3BPAC-1, Switzerland) and a heart rate monitor (Polar®, model RS800cx, Finland), respectively. The mean arterial pressure (MAP), the double product (RPP) and the pulse pressure (PP) were calculated by means of mathematical equations. The evaluation of the area under the curve (AUC) of the CVIM tests showed a significant increase for the HR (AUC, p = 0.0004) and RPP (AUC, p = 0.0032) for the ILP45o when compared to the IHG. Significant increases for SBP and MAP also occurred at the end of the third trial for the ILP45o test compared to the IHG. However, at the end of each trial no significant differences were found for DBP and PP between the protocols (IHG vs. ILP45o). Our findings demonstrate that in young people with experience in strength training who underwent CVIM test involving large muscle mass (ILP45o), HR and RPP may be better markers than blood pressure to measure cardiovascular responsiveness.