Post-exercise changes in blood pressure, heart rate and rate pressure product at different exercise intensities in normotensive humans

Abstract

To evaluate the effect of exercise intensity on post-exercise cardiovascular responses, 12 young normotensive subjects performed in a randomized order three cycle ergometer exercise bouts of 45 min at 30, 50 and 80% of VO 2 peak, and 12 subjects rested for 45 min in a nonexercise control trial. Blood pressure (BP) and heart rate (HR) were measured for 20 min prior to exercise (baseline) and at intervals of 5 to 30 (R5-30), 35 to 60 (R35-60) and 65 to 90 (R65-90) min after exercise. Systolic, mean, and diastolic BP after exercise were significantly lower than baseline, and there was no difference between the three exercise intensities. After exercise at 30% of VO 2 peak, HR was significantly decreased at R35-60 and R65-90. In contrast, after exercise at 50 and 80% of VO 2 peak, HR was significantly increased at R5-30 and R35-60, respectively. Exercise at 30% of VO 2 peak significantly decreased rate pressure (RP) product (RP = HR x systolic BP) during the entire recovery period (baseline = 7930 ± 314 vs R5-30 = 7150 ± 326, R35-60 = 6794 ± 349, and R65-90 = 6628 ± 311, P<0.05), while exercise at 50% of VO 2 peak caused no change, and exercise at 80% of VO 2 peak produced a significant increase at R5-30 (7468 ± 267 vs 9818 ± 366, P<0.05) and no change at R35-60 or R65-90. Cardiovascular responses were not altered during the control trial. In conclusion, varying exercise intensity from 30 to 80% of VO 2 peak in young normotensive humans did not influence the magnitude of post-exercise hypotension. However, in contrast to exercise at 50 and 80% of VO 2 peak, exercise at 30% of VO 2 peak decreased post-exercise HR and RP. Correspondence

Redução da pressão arterial e do duplo produto de repouso após treinamento resistido em idosas hipertensas

“…Although no one study in literature has investigated these mechanisms, it has been suggested that the control of BP after a RT program can be the result of a sum of acute effects from several strength exercise sessions 28,29 . In this sense, there is a study that has normotensive individuals, and it is likely that the mechanisms involved in controlling BP in elderly people are different due to age and the presence of health conditions such as systemic arterial hypertension 31 . Therefore, we suggest that further studies be conducted to analyze the mechanisms involved in reducing BP after RT in elderly people.…”

“…The reduction of RPP at rest plays a significant role in reducing risks of cardiovascular problems 31 . Thus, it seems that RT can lead to a reduction in cardiovascular work.…”

Potential causes, mechanisms, and implications of post exercise hypotension

“…88 However, the increase is short lived and often found to undershoot basal levels within minutes of recovery. 88,89 Because plasma K + concentration is proportional to exercise intensity, yet PEH does not appear to be intensity dependent 36,44,62 and persists for hours after exercise, it is unlikely that K + is involved in the PEH.…”

Heart rate recovery after exercise: relations to heart rate variability and complexity

“…It is well known that the magnitude of neural and hemodynamic responses to exercise is related to exercise intensity (16). In our study we assessed cardiovascular parameters after exercise at 70% of individual maximal power output level.…”