Effects of aerobic, resistance and concurrent exercise on pulse wave reflection and autonomic modulation in men with elevated blood pressure

The acute effects of exercise modes on pulse wave reflection (PWR) and their relationship with autonomic control remain undefined, particularly in individuals with elevated blood pressure (BP). We compared PWR and autonomic modulation after acute aerobic (AE), resistance (RE), and concurrent exercise (CE) in 15 men with stage-1 hypertension (mean +/- SE: 34.7 +/- 2.5 years, 28.4 +/- 0.6 kg/m(2), 133 +/- 1/82 +/- 2 mmHg). Participants underwent AE, RE, and CE on different days in counterbalanced order. Applanation tonometry and heart rate variability assessments were performed before and 30-min postexercise. Aortic pressure decreased after AE (-2.4 +/- 0.7 mmHg; P = 0.01), RE (-2.2 +/- 0.6 mmHg; P = 0.03), and CE (-3.1 +/- 0.5 mmHg; P = 0.003). Augmentation index remained stable after RE, but lowered after AE (-5.1 +/- 1.7%; P = 0.03) and CE (-7.6 +/- 2.4% P = 0.002). Systolic BP reduction occurred after CE (-5.3 +/- 1.9 mmHg). RR-intervals and parasympathetic modulation lowered after all conditions (similar to 30-40%; P<0.05), while the sympathovagal balance increased after RE (1.2 +/- 0.3-1.3 +/- 0.3 n.u., P<0.05). Changes in PWR correlated inversely with sympathetic and directly with vagal modulation in CE. In conclusion, AE, RE, and CE lowered central aortic pressure, but only AE and CE reduced PWR. Overall, those reductions related to decreased parasympathetic and increased sympathetic outflows. Autonomic fluctuations seemed to represent more a consequence than a cause of reduced PWR.