Effect of differences in post-exercise lactate accumulation in athletes’ haemodynamics

Crisafulli, Antonio; Tocco, Filippo; Pittau, Gianluigi; Lorrai, Luigi; Porru, Cristina; Salis, Enrico; Pagliaro, Pasquale; Melis, Franco; Concu, Alberto
August 2006
Applied Physiology, Nutrition & Metabolism;Aug2006, Vol. 31 Issue 4, p423
Academic Journal
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% Wat and 130% Wat tests), and 1 was performed until exhaustion at 150% of the maximum workload achieved during a previous incremental test (150% Wmax test). During the recovery period after the 150% Wmax 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·L–1 in the 150% Wmax (p > 0.05 with respect to the other protocol sessions), 130% Wat, and 70% Wat tests, respectively. We also observed greater reductions in cardiac pre-load and systemic vascular resistance in the 150% Wmax test than in the 130% Wat and 70% Wat tests. However, the cardiac output response successfully faced the increased vasodilatation occurring during 150% Wmax 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.


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