Post-concurrent exercise hemodynamics and cardiac autonomic modulation |
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Authors: | Luiz Teixeira Raphael Mendes Ritti-Dias Taís Tinucci Décio Mion Júnior and Cláudia Lúcia de Moraes Forjaz |
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Institution: | (1) Exercise Hemodynamic Laboratory, School of Physical Education and Sport, University of S?o Paulo, S?o Paulo, Brazil;(2) School of Physical Education, University of Pernambuco, Pernambuco, Brazil;(3) Hypertension Unit, General Hospital, Faculty of Medicine, University of S?o Paulo, S?o Paulo, Brazil;(4) Av.Prof. Mello Moraes, 65, Butant?, S?o Paulo, SP, 05508-030, Brazil; |
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Abstract: | Concurrent training is recommended for health improvement, but its acute effects on cardiovascular function are not well established.
This study analyzed hemodynamics and autonomic modulation after a single session of aerobic (A), resistance (R), and concurrent
(A + R) exercises. Twenty healthy subjects randomly underwent four sessions: control (C:30 min of rest), aerobic (A:30 min,
cycle ergometer, 75% of VO2 peak), resistance (R:6 exercises, 3 sets, 20 repetitions, 50% of 1 RM), and concurrent (AR: A + R). Before and after the
interventions, blood pressure (BP), heart rate (HR), cardiac output (CO), and HR variability were measured. Systolic BP decreased
after all the exercises, and the greatest decreases were observed after the A and AR sessions (−13 ± 1 and −11 ± 1 mmHg, respectively,
P < 0.05). Diastolic BP decreased similarly after all the exercises, and this decrease lasted longer after the A session. CO
also decreased similarly after the exercises, while systemic vascular resistance increased after the R and AR sessions in
the recovery period (+4.0 ± 1.7 and +6.3 ± 1.9 U, respectively, P < 0.05). Stroke volume decreased, while HR increased after the exercises, and the greatest responses were observed after
the AR session (SV, A = −14.6 ± 3.6, R = −22.4 ± 3.5 and AR = −23.4 ± 2.4 ml; HR, A =+13 ± 2, R =+15 ± 2 vs. AR =+20 ± 2 bpm,
P < 0.05). Cardiac sympathovagal balance increased after the exercises, and the greatest increase was observed after the AR
session (A = +0.7 ± 0.8, R = +1.0 ± 0.8 vs. AR = +1.2 ± 0.8, P < 0.05). In conclusion, the association of aerobic and resistance exercises in the same training session did not potentiate
post-exercise hypotension, and increased cardiac sympathetic activation during the recovery period. |
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