IJCS | Volume 32, Nº1, January/ February 2019

51 Figure 1 - Systolic blood pressure (SBP) behavior and mean arterial pressure (MAP) during the first hour following (A) high-intensity interval exercise (HIIE) and (B) continuous aerobic exercise (CONT); *p < 0.05 compared with pre-exercise, within- group comparisons. SBP HIIE MAP HIIE SBP CONT MAP CONT Boeno et al. Post-exercise hypotension Int J Cardiovasc Sci. 2019;32(1)48-54 Original Article in hypertensive, elderly subjects during a 24-hour period, with significantly lower BP levels in HIIE than CONT. According to the authors, these findings may be attributed to elevated BP levels in the study population, and the muscle mass involved in the exercise, since treadmill protocols seem to exert a higher effect on PEH. 20,21 It is worth pointing out that the protocols used in the studies cited above were not matched by volume. Lacombe et al., 22 compared the influence of equicaloric protocols of HIIE and CONT (not matched by volume) on PEH in prehypertensive subjects. 22 Reduced BP was seen one hour after the exercise sessions, with no significant differences between them. 22 These findings corroborate our results, since, as exercises sessions were equalized by volume (i.e., total distance covered) or by energy expenditure, the magnitude of PEH caused by the exercise tests was not different between the conditions. In addition, in the study by Lacombe et al., 22 exercise duration was similar between HIIE and CONT (~20 vs. ~21 min, respectively), 22 whereas results of our study indicated a higher time/efficiency ratio, with shorter duration (~35 vs. ~44 min), for HIIE, compared with CONT. The results of the present study showed that, compared with baseline BP values, there was an