High blood pressure (BP) is a health condition that can be controlled through physical exercise, which results in its reduction.
However, there is evidence in the literature that approximately 25% of the population does not have this benefit and the
causes for this fact are unknown, although it is suggested that the nervous system, training intensity, and initial blood
pressure may theoretically explain the absence decrease in BP. Thus, the objective of this article was to investigate which
factors influence the non-reduction in blood pressure of exercise practitioners at the Academia da Melhor Idade (AMI) in
the city of Tocantinópolis-TO. This is an observational study, where BP was monitored daily from April to June 2018.
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Hypertensive and diabetic patients who exercise in AMI participated. The exercise was prescribed and supervised by the
academy's teachers. BP and heart rate were checked before the beginning of each evaluation day, and always at the end of
each exercise session. One-way ANOVA and linear regression were used. The results show that the resting or post-exercise
systolic blood pressure (SBP) did not significantly decrease between the months of observation, while the diastolic blood
pressure (DBP) significantly reduced the resting BP between the months of April and May (from 79.3 ± 9.7 for 73.0 ± 7.1,
p = 0.02, Cohen's D = 0.77). The intensity adopted for training in the months of April, May and June was between 49.9 ±
5.6 to 53.2 ± 6.5 (p = 0.6; D Cohen = 0.5). As predictor variables, it was noted that SDNN (95% CI: 0.3 - 0.6, p = 0.0),
RMSSD (95% CI: -2.3 - -1.5, p = 0.0) and pre-exercise SBP (95% CI: 0.3 - 0.8, p = 0.0) were related to SBP after training.
For the DBP, it was observed that the LF / HF (95% CI: -4.2 - -0.8, p = 0.0) and the pre-exercise DBP (95% CI: 0.3 - 1.1, p
= 0.0) predicted the post-DBP -exercise in the month of April. It was concluded that the blood pressure of the volunteers
did not significantly decrease throughout all months of training, that the intensity adopted for training was considered mild,
and that variables of the autonomic nervous system as well as pre-exercise systolic or diastolic blood pressure actually
predict not to lower blood pressure.
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