Post-resistance exercise hemodynamic and autonomic responses: Comparison between normotensive and hypertensive men

To compare post-resistance exercise hypotension (PREH) and its mechanisms in normotensive and hypertensive individuals, 14 normotensives and 12 hypertensives underwent two experimental sessions: control (rest) and exercise (seven exercises, three sets, 50% of one repetition maximum). Hemodynamic and autonomic clinic measurements were taken before (Pre) and at two moments post-interventions (Post 1: between 30 and 60min; Post 2: after 7h). Ambulatory blood pressure (BP) was monitored for 24h. At Post 1, exercise decreased systolic BP similarly in normotensives and hypertensives (-8 +/- 2 vs -13 +/- 2mmHg, P>0.05), whereas diastolic BP decreased more in hypertensives (-4 +/- 1 vs -9 +/- 1mmHg, P<0.05). Cardiac output and systemic vascular resistance did not change in normotensives and hypertensives (0.0 +/- 0.3 vs 0.0 +/- 0.3L/min; -1 +/- 1 vs -2 +/- 2U, P>0.05). After exercise, heart rate (+13 +/- 3 vs +13 +/- 2bpm) and its variability (low- to high-frequency components ratio, 1.9 +/- 0.4 vs +1.4 +/- 0.3) increased whereas stroke volume (-14 +/- 5 vs -11 +/- 5mL) decreased similarly in normotensives and hypertensives (all, P>0.05). At Post 2, all variables returned to pre-intervention, and ambulatory data were similar between sessions. Thus, a session of resistance exercise promoted PREH in normotensives and hypertensives. Although this PREH was greater in hypertensives, it did not last during the ambulatory period, which limits its clinical relevance. In addition, the mechanisms of PREH were similar in hypertensives and normotensives.