Cardiac autonomic modulation during progressive upper limb exercise by patients with coronary artery disease

Autor(es)

Machado, H. G. ^[1] ; Simoes, R. P. ; Mendes, R. G. ; Castello, V. ; Di Thommazo, L. ; Almeida, L. B. ; Lopes, S. L. B. ^[2] ; Catai, A. M. ; Borghi-Silva, A. ^{[3, 1]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Engn Sao Carlos, Programa Posgrad Interunidades Bioengn, Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Med, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Fed Sao Carlos, UFSCar, Nucleo Pesquisa Exercicio Fis, Dept Fisioterapia, Lab Fisioterapia Cardiopulm, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Medical and Biological Research; v. 44, n. 12, p. 1276-1284, DEC 2011.
• Citações Web of Science: 11

Resumo

The purpose of this study was to investigate the behavior of heart rate (HR) and HR variability (HRV) during different loads of resistance exercise (incline bench press) in patients with coronary artery disease (CAD) and healthy sedentary controls. Ten healthy men (65 +/- 1.2 years, control group, CG) and 10 men with clinically stable CAD (66 +/- 2.4 years, CADG) were recruited. A discontinuous progressive protocol was applied with an initial load of 10% of the maximum load achieved in the 1RM (1 repetition maximum) with increases of 10% until 30% 1RM was reached, which was followed by subsequent increases of 5% 1RM until exhaustion. HRV was analyzed by linear and non-linear methods. There was a significant reduction in rMSSD (CG: 20 +/- 2 to 11 +/- 3 ms; CADG: 19 +/- 3 to 9 +/- 1 ms) and SD1 indexes (CG: 14 +/- 2 to 8 +/- 1 ms; CADG: 14 +/- 2 to 7 +/- 1 ms). An increase in HR (CG: 69 +/- 5 to 90 +/- 5 bpm; CADG: 62 +/- 4 to 75 +/- 4 bpm) and in systolic blood pressure (CG: 124 +/- 3 to 138 +/- 3 mmHg; CADG: 122 +/- 6 to 126 +/- 9 bpm) were observed (P < 0.05) when comparing pre-effort rest and 40% 1RM in both groups. Furthermore, an increase in RMSM index was also observed (CG: 28 +/- 3 to 45 +/- 9 ms; CADG: 22 +/- 2 to 79 +/- 33 ms), with higher values in CADG. We conclude that loads up to 30% 1RM during incline bench press result in depressed vagal modulation in both groups, although only stable CAD patients presented sympathetic overactivity at 20% 1RM upper limb exercise. (AU)

• Processo FAPESP: 06/53414-3 - Avaliacao de frequencia cardiaca e sua variabilidade em exercicio fisico dinamico resistido no supino inclinado em pacientes com doenca arterial coronariana.
• Beneficiário: Heloisa Giangrossi Machado Vidotti
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 07/53202-9 - Efeitos de diferentes níveis de pressão positiva nas vias aéreas sobre o padrão ventilatório e a variabilidade da frequência cardíaca de pacientes submetidos à cirurgia de revascularização do miocárdio
• Beneficiário: Camila Bianca Falasco Pantoni
• Modalidade de apoio: Bolsas no Brasil - Mestrado