Effect of differences in post-exercise lactate accumulation in athletes' haemodynamics.
To verify the relationship between exercise intensity and post-exercise haemodynamics, we studied haemodynamic and lactate responses during 10 min following 3 bicycle tests. Two tests were performed for 3 min at 70% and 130% of the workload corresponding to anaerobic threshold (70% W(at) and 130% W(at) tests), and 1 was performed until exhaustion at 150% of the maximum workload achieved during a previous incremental test (150% W(max) test). During the recovery period after the 150% W(max) test we observed the highest increases in blood lactate with respect to the baseline: at the 9th minute of recovery lactate concentration increased by +9.3 +/- 2.7, +6.4 +/- 3.1, and +1.1 +/- 0.9 mmol x L(-1) in the 150% W(max) (p > 0.05 with respect to the other protocol sessions), 130% W(at), and 70% W(at) tests, respectively. We also observed greater reductions in cardiac pre-load and systemic vascular resistance in the 150% W(max) test than in the 130% W(at) and 70% W(at) tests. However, the cardiac output response successfully faced the increased vasodilatation occurring during 150% W(max) test so that changes in mean blood pressure were similar in the 3 test conditions. This study shows that exercises that yielded different lactate concentrations also led to greater vasodilatation. Nevertheless, mechanisms controlling the cardiovascular apparatus successfully prevented a drop in blood pressure in spite of the cardiovascular stress.
Crisafulli
Antonio
A
Department of Science Applied to Biological Systems, Section of Human Physiology, University of Cagliari, via Porcell 4, 09124 Cagliari, Italy. crisafulli@tiscali.it
Tocco
Filippo
F
Pittau
Gianluigi
G
Lorrai
Luigi
L
Porru
Cristina
C
Salis
Enrico
E
Pagliaro
Pasquale
P
Melis
Franco
F
Concu
Alberto
A
D000328:Adult; D001794:Blood Pressure; D002302:Cardiac Output; D015444:Exercise / Q000502:physiology*; D006339:Heart Rate; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D010101:Oxygen Consumption; D013177:Sports / Q000502:physiology*; D013318:Stroke Volume; D014655:Vascular Resistance; D014664:Vasodilation
D019344:Lactic Acid