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Original articles  CARDIOVASCULAR SYSTEM


The Journal of Sports Medicine and Physical Fitness 2004 March;44(1):54-62

language: English

54 Postexercise hypotension and hemodynamics: the role of exercise intensity

Forjaz C. L. M., Cardoso C. G. Jr, Rezk C. C., Santaella D. F., Tinucci T.

School of Phys­ical Edu­ca­tion and ­Sport, Uni­ver­sity of São ­Paulo, São ­Paulo, ­Brazil


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Aim. ­Although post­ex­er­cise hypo­ten­sion (PEH) has ­already ­been exten­sively dem­on­strated, the influ­ence of exer­cise inten­sity on its mag­ni­tude and mech­a­nisms is ­still con­tro­ver­sial.
­Methods. ­Twenty-­three nor­mo­ten­sive sub­jects ­were sub­mitted to a con­trol (45 min­utes of ­rest) and 3 exer­cise ses­sions (­cycle ergom­eter, 45 min­utes at 30%, 50% and 75% of V.O2­peak) to inves­ti­gate the ­role of exer­cise inten­sity on PEH. ­Blood pres­sure (BP - aus­cul­ta­tory), ­heart ­rate (HR - ECG), and car­diac ­output (CO - CO2 ­rebreathing) ­were meas­ured ­before and ­after the con­trol and exer­cise ses­sions.
­Results. Sys­tolic BP ­decreased sig­nif­i­cantly ­after exer­cise at 50% and 75% of V.O2­peak. Dia­stolic BP ­increased sig­nif­i­cantly ­during the con­trol ses­sion, did not ­change ­after exer­cise at 30% of V.O2­peak, and ­decreased sig­nif­i­cantly ­after exer­cise at 50% and 75% of V.O2­peak. ­This ­fall was ­greater and ­longer ­after ­more ­intense exer­cise. CO and ­systemic vas­cular resis­tance (SVR) ­responses ­were sim­ilar ­between ses­sions, CO ­increased ­whereas SVR ­decreased sig­nif­i­cantly. ­Stroke ­volume (SV) ­increased and ­heart ­rate (HR) ­decreased fol­lowing con­trol and exer­cise at 30% of V.O2­peak ­whereas SV ­decreased and HR ­increased ­after exer­cise at 50% and 75% of V.O2­peak.
Con­clu­sion. PEH is ­greater and ­longer ­after ­more ­intense exer­cise. BP pro­file is fol­lowed by a ­decrease in SVR and an ­increase in CO, ­what was not influ­enced by pre­vious exer­cise. The ­increase in CO is ­caused by an ­increase in SV ­after ­rest and low inten­sity exer­cise and by an ­increase in HR ­after mod­erate and ­more ­intense ­aerobic exer­cise.

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