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Revista Brasileira de Geriatria e Gerontologia

versão impressa ISSN 1809-9823versão On-line ISSN 1981-2256

Rev. bras. geriatr. gerontol. vol.22 no.6 Rio de Janeiro  2019  Epub 15-Jun-2020

https://doi.org/10.1590/1981-22562019022.190166 

Original Articles

Blood pressure pattern following a combined exercise session in hypertensive older women

Matheus Pamplona Fachini1 
http://orcid.org/0000-0002-6484-8356

Guilherme Tadeu de Barcelos2 
http://orcid.org/0000-0003-1356-1213

Juliana Cavestré Coneglian2 
http://orcid.org/0000-0003-1421-5005

Paulo Ricardo de Oliveira Medeiros2 
http://orcid.org/0000-0002-9364-2525

Aline Mendes Gerage2 
http://orcid.org/0000-0002-0555-5422

1 Universidade Federal de Santa Catarina, Departamento de Educação Física, Centro de Desportos. Florianópolis, SC, Brasil.

2 Universidade Federal de Santa Catarina, Departamento de Educação Física, Centro de Desportos, Programa de Pós-Graduação em Educação Física. Florianópolis, SC, Brasil.


Abstract

Objective:

The aim of the present study was to verify the behavior of hemodynamic variables in hypertensive older women following a combined exercise session and to identify the intensity of effort achieved in this session.

Method:

The study included 14 hypertensive older women (72.0±6.7 years old) who regularly practiced physical activities. The participants underwent a one-hour combined exercise session performed in a group, with intensity of effort monitored by accelerometry (Actigraph, model GT3X+). The hemodynamic parameters (systolic blood pressure, diastolic blood pressure, heart rate, stroke volume, cardiac output and peripheral vascular resistance) were individually measured by finger photoplethysmography (Finometer) before and after (60 min) the exercise session.

Results:

The sessions consisted predominantly of low-light intensity activities (60%) and 20% of class time was spent on sedentary behavior. None of the evaluated variables exhibited changes when the pre and post-exercise values were compared ​​(p>0.05). Systolic blood pressure behavior correlated positively with time spent in sedentary behavior (r=0.541; p=0.045).

Conclusion:

The combined exercise sessions, as conducted, did not generate post-exercise hypotension. In addition, the time spent in typically sedentary activities during the classes positively correlated with changes in blood pressure, suggesting that combined exercise programs, applied in the form of collective aerobic exercises, should be composed of higher intensity activities.

Keywords: Post-Exercise Hypotension; Accelerometry; Aging; Combined Exercise

Resumo

Objetivo

: O presente estudo teve como objetivos verificar o comportamento de variáveis hemodinâmicas após uma sessão de exercício combinado em idosas hipertensas e identificar qual a intensidade de esforço alcançada nessa sessão.

Método

: Participaram deste estudo 14 mulheres idosas (72,0±6,7 anos), hipertensas, que praticavam regularmente atividade física. As participantes foram submetidas a uma sessão de uma hora de exercício combinado executado em grupo, com monitoramento da intensidade de esforço por meio de acelerometria (Actigraph, modelo GT3X+). Parâmetros hemodinâmicos (pressão arterial sistólica, pressão arterial diastólica, frequência cardíaca, volume sistólico, débito cardíaco e resistência vascular periférica) foram mensurados individualmente, por meio de fotopletismografia de dedo (Finometer), antes e após (60 min) a sessão de exercício.

Resultados

: As sessões foram compostas, predominantemente, por atividades de intensidade leve baixa (60%) e 20% do tempo das aulas foi gasto em comportamento sedentário. Nenhuma das variáveis avaliadas apresentou modificação quando comparados os valores pré e pós-exercício (p>0,05). O comportamento da pressão arterial sistólica correlacionou-se positivamente com o tempo gasto em comportamento sedentário (r=0,541; p=0,045).

Conclusão

: Da maneira como foram conduzidas, as sessões de exercício físico combinado não foram capazes de gerar hipotensão pós-exercício. Além disso, o tempo despendido em atividades tipicamente sedentárias durante as aulas apresentou correlação positiva com as mudanças da pressão arterial, sugerindo que programas de exercícios combinados, aplicados em forma de ginástica coletiva, sejam compostos por atividades de intensidade mais elevada.

Palavras-chave: Hipotensão Pós-Exercício; Acelerometria; Envelhecimento; Exercício Combinado

INTRODUCTION

Systemic arterial hypertension (SAH), characterized by systolic blood pressure (SBP) values greater than or equal to 140 mmHg and/or diastolic blood pressure (DBP) greater than or equal to 90 mmHh1, is directly associated with age, with prevalences of 64% for men and 63% for women aged between 65 and 74 years 2. The regular practice of physical exercise, primarily aerobic, but also that which focuses on muscle strength, is considered an essential non-drug therapy in the prevention and treatment of SAH, as it promotes a chronic reduction in blood pressure (BP) in the older population1-3.

Furthermore, a single exercise session is capable of promoting a post-exercise reduction in BP, when compared with pre-exercise levels or to a control session, resulting in a phenomenon known as post-exercise hypotension (PEH) 4,5. PEH can last for up to 24 hours, which is relevant not only because it means the cardiovascular system is exposed to elevated BP for a shorter period, but also because there are indications that individuals who are responsive to the acute effects of training tend to be responsive to chronic effects6-8.

Different factors can interfere with the occurrence and magnitude of PEH, such as exercise intensity9, but the minimum intensity for obtaining the best regulation of BP has not yet been established. In addition, it is noteworthy that most studies investigating the PEH phenomenon have been restricted to evaluating dynamic and isometric aerobic or resistance exercises considered in isolation. However, the combined practice of different exercise modalities in the same session has rarely been investigated, especially in exercise sessions in the form of dynamic group classes, which are often practiced by older adults.

In this sense, it is noteworthy that, although programs involving dynamic group gym classes are strongly encouraged for the older population, as they promote health benefits in general10, it has still not been fully established whether the intensity achieved in training sessions, through collective classes, is suitable for achieving the expected results. A study by Borges et al.11 demonstrated, for example, that collective aerobic sessions for older adults applied in basic health units in Florianópolis (Santa Catarina) were mostly composed of activities of light or sedentary intensity, but few studies have analyzed the intensity of this type of exercise session in an objective manner through accelerometry. It is also unknown whether the intensities achieved in these exercise sessions are capable of promoting a post-exercise reduction in BP, which would possibly be associated with the occurrence of a chronic decline in BP.

Therefore, it is important to investigate whether exercise sessions, in the form of collective aerobics classes, carried out in public projects aimed at promoting physical activity, are capable of causing PEH in the older population, as this type of class is one of the main forms of physical activity among this population. Thus, the present study aimed to analyze the behavior of the SBP, DBP, cardiac output (CO) and peripheral vascular resistance (PVR) variables after a session of combined physical exercise (aerobic + strength), in the form of a collective class, of hypertensive older women. In addition, we sought to investigate the correlation between post-exercise BP responses and the effort intensities achieved by the hypertensive older adults during these sessions. Finally, the correlation between post-exercise BP responses and the behavior of the CO and PVR variables was tested only among those older women who exhibited PEH.

METHOD

The present study was carried out between August and November 2018, using a quasi-experimental design, as there was no control group and/or session. No previous sample calculation was performed, so the study sample was recruited on a voluntary basis and selected for convenience, consisting of 14 older women (≥60 years), diagnosed with SAH, participating in an extension program at the Universidade Federal de Santa Catarina (Santa Catarina Federal University) (UFSC) in the city of Florianópolis, Brazil, which offers collective aerobics classes aimed at this population, twice a week. To participate in the study, the older women were required to have been engaged in this program for at least six months and not have any more severe comorbidities (such as severe heart disease) or injuries that prevented exercise.

The study was approved by the local Ethics Committee (approval opinion number: 2,870,053), according to the rules of resolution 466-2012 of the National Health Council, and all participants signed an informed consent form (ICF), after being informed about the objectives and procedures of the study.

There were 14 sessions of combined exercises in the form of collective classes, with each participant being evaluated in one of these sessions, which were organized and structured in a similar way. In each assessment, at the beginning of the program, anthropometric and resting BP (pre-exercise) data were collected from the participants. Subsequently, an accelerometer was attached to each individual, above the iliac crest, before the beginning of the gym class, so that the intensity of the class was recorded. At the end of the session, the accelerometer was collected and BP was measured again over a 60 minute period (post-exercise) (Figure 1).

Figure 1 Experimental design of study. Florianópolis (Santa Catarina), Brazil, 2018. 

For the general characterization of the sample, body mass measurements were performed using an Omron HBF-540C digital reading scale, with 0.1 kg accuracy, and height was taken with a stadiometer with 0.1 cm accuracy. From these measurements, the Body Mass Index (BMI) was calculated, with the division of body mass (in kg) by square height (in meters). Information was also collected about the marital status of the participants through an interview.

The finger photoplethysmography technique, with a single Finometer device (FMS - Finapress Medical System, Netherlands), was used to analyze the hemodynamic variables, beat by beat, in a non-invasive manner, in the pre- and post-exercise phases, by two previously trained evaluators, who performed all assessments in a standardized manner and followed all procedures according to the recommendations given by the manufacturers of the instruments used. The variables evaluated were SBP and DBP, heart rate (HR), stroke volume (SV), CO and PVR.

The older adults were instructed not to drink any type of caffeinated beverage, such as green tea, coffee or soda, for at least 12 hours before the evaluation, not to consume alcoholic beverages and not to perform intense physical exercise 24 hours before data collection and also to eat a light diet on the day. During both pre and post-exercise data collection they were placed in the supine position on a stretcher where they remained at rest for five minutes. To calibrate the device, data on age, sex, body mass and height were provided according to the manufacturer’s instructions. Two inflatable cuffs were attached to the middle finger of the left hand and the left arm of the individual. For the taking of measurements, the device was calibrated until the excellent signal was obtained. Subsequently, during the pre-exercise stage, the hemodynamic variables were monitored continuously for 10 minutes, with the average values from this period recorded for analysis purposes. During the post-exercise stage, after calibration, monitoring was performed continuously for 60 minutes, with the average of the variables recorded every 15 minutes for analysis purposes.

The exercise sessions took the form of collective aerobics classes, with an average duration of 50 minutes, consisting of warm-up, the main exercise part and relaxation, with the aim of developing aerobic capacity and muscle strength. The warm-up lasted 10 minutes and consisted of aerobic activities (such as walking around the room), together with warm-up of the joints of the upper and lower limbs. The main part of the exercise lasted approximately 30 minutes, and was composed of static and dynamic resistance exercises for the lower and upper limbs. At the end of the session, about 10 minutes were used for relaxation, through the performance of passive or active static stretching exercises.

The intensity of these classes was measured using an accelerometer (Actigraph, model GT3X +) attached to the participants’ right hip. The cut-off point adapted by Buman et al.12 was adopted to categorize the intensity of effort achieved in four levels: sedentary, low-light physical activity, high-light physical activity and moderate to vigorous physical activity.

First, a descriptive analysis was carried out to characterize the sample, with the presentation of quantitative data in means and standard deviations and categorical data in absolute and relative frequencies. The Shapiro-Wilk test was performed for the analysis of data normality. To compare the values of hemodynamic variables from the pre- to the post-exercise phase, a one-way analysis of variance (ANOVA) was performed for repeated measures, after confirming normality. The Bonferroni post-hoc test was used to identify the differences in the variables for which the ANOVA values found were superior to the established criterion of statistical significance (p<0.05). For variables without a normal distribution, the Kruskal-Wallis non-parametric test was used. To test the correlation between the deltas (Δ) of the SBP and DBP variables with the intensity of the classes and with the Δ of the CO and the PVR variables, the Pearson test was used for data with normal distribution and the Spearman test for data that did not show normality. The level of statistical significance established was p<0.05. All analyzes were performed using the statistical package R, version 3.5.3.

RESULTS

Table 1 presents the descriptive data of the sample and the pre-exercise values of the hemodynamic variables. Analyzing the mean BMI, the older women, in general, were classified as overweight. Half of the participants (seven) used two or more medications for the treatment of SAH. The sample was composed of six married women (43%), followed by four widows (28.6%) and four divorced women (28.6%).

Table 1 General characteristics of the sample and hemodynamic values prior to exercise (n=14). Florianópolis (Santa Catarina), Brazil, 2018. 

Variables Mean ± standard deviation
Age (years) 72.0 ± 6.7
Height (cm) 156.1 ± 6.7
Body mass (kg) 67.7 ± 9.6
Body mass index (kg/m2) 27.8 ± 3.3
Time since diagnosis of hypertension (years) 18.0 ± 9.4
Pre-exercise SBP (mmHg) 142.4 ± 14.5
Pre-exercise DBP (mmHg) 69.5 ± 9.6
Pre-exercise HR (bpm) 64.2 ± 10.4
Pre-exercise SV (ml) 94.4 ± 32.8
Pre-exercise CO (l/min) 6.0 ± 2.2
Pre-exercise PVR (dyn.s/cm5) 1502.7 ± 654.8

SBP = systolic blood pressure; DBP = diastolic blood pressure; HR = heart rate; SV = stroke volume; CO = cardiac output; PVR = peripheral vascular resistance.

Regarding the intensities of effort of the classes, it was observed that they were, predominantly, composed of low intensity activities (60%), which corresponded to 23.9 minutes of the classes. However, considerable class time (20%) was spent on sedentary behavior (8.1 minutes). Less time was devoted to activities of high-light (12%) and moderate to vigorous (8%) intensity, which corresponded to 4.8 and 3.2 minutes, respectively.

Figure 2 shows the behavior of the SBP, DBP, HR, SV, CO and PVR variables during the post-exercise follow-up period, compared to the pre-exercise values.

Figure 2 Behavior of the hemodynamic variables at moments 15, 30, 45 and 60 minutes post-exercise in relation to the pre-exercise phase. The values are represented by delta (Δ). The value adopted for statistical significance was p<0.05. Ŧ` value of p obtained through the Kruskal-Wallis test (n=14). Florianópolis (Santa Catarina), Brazil, 2018. 

When comparing the pre and post-exercise values of all the measurement times, there was no statistically significant difference for any of the variables analyzed (p>0.05). For SBP, although the mean after 15 minutes showed a reduction in relation to the pre-exercise phase (137.2±14.8 vs 142.4±14.5), which would indicate post-exercise hypotension, the reduction was not significant (p>0.05). The increases visually identified for the different variables were also not statistically significant.

Table 2 shows the correlations between the SBP and DBP deltas (Δ), calculated using the average of the four post-exercise measurements (15΄, 30΄, 45΄ and 60΄) minus the pre-exercise value, with the average time spent at the different intensities achieved in the sessions: sedentary, low-light, high-light and moderate to vigorous.

Table 2 Correlation between SBP and DBP deltas with the average time spent in class at each intensity of effort (n=14). Florianópolis (Santa Catarina), Brazil, 2018. 

SED p-value Low-Light p-value High-Light p-value MVPA p-value
PA PA
Δ SBP 0.541 0.045* 0.168 0.565 -0.189 0.516 0.114* 0.696
Δ DBP 0.257 0.374 0.115 0.694 -0.347 0.223 -0.064* 0.827

ΔSBP= changes observed in SBP between the pre-exercise phase and the mean of the post-exercise measurement times; ΔDBP= changes observed in DBP between the pre-exercise phases and the mean of the post-exercise measurement times; *Spearman’s correlation; p-value<0.05.

A moderate positive correlation was observed between the Δ SBP and the time spent in sedentary behavior (r=0.541; p=0.045), suggesting that the greater the time spent in sedentary behavior during sessions, the greater the increase in SBP. The other correlations were weak and had no statistical significance (r <0.5; p>0.05).

Table 3 shows the correlation between the SBP and DBP deltas (Δ) and the CO and PVR deltas (Δ), for the participants with PEH only.

Table 3 Correlation of SBP, DBP, CO and PVR deltas in participants with PEH (n=7). Florianópolis (Santa Catarina), Brazil, 2018. 

Δ CO p-value Δ PVR p-value
Δ SBP -0.336 0.460 0.573 0.177
Δ DBP 0.346 0.446 -0.273 0.553

ΔSBP, ΔDBP, ΔCO and ΔPVR= changes observed in hemodynamic variables between the pre-exercise phase and the mean of the post-exercise measurement times.

Among the seven older women with a reduction in SBP from the pre- to the post-exercise (the mean of all the post-exercise measurement times) phases, there was no significant correlation with the changes identified in PVR or CO (p>0.05). The same scenario was observed for the seven older women who exhibited a reduction in DBP from the pre- to the post-exercise phase (mean of all the post-exercise measurement times) (p>0.05).

DISCUSSION

The main findings of the present study indicate that PEH was not observed in response to a combined exercise session, in a collective class format, in hypertensive older women. According to the results found, at the end of the 60-minute post-exercise follow-up period, there were non-statistically significant increases of about 8 mmHg for SBP and 4 mmHg for DBP. In addition, the increase in SBP values was associated with time spent on activities classified as sedentary during the session (8.1 minutes). Thus, the greater the time spent in sedentary activities during class, the greater the increase in post-exercise SBP, which is similar to what has been observed in other studies that evaluated the association between sedentary periods and biomarkers in older individuals13.

The results found in the present study differ from other previous studies that observed PEH in older women after an exercise session6,14. In the study by Santana et al., hypertensive older women undergoing an exercise session of moderate and vigorous intensity exhibited PEH in sessions of both intensities in comparison with the control session14. In the study by Moreira et al.6, a resistance exercise session, performed with three sets of 12 repetitions at 60% of 1RM in each exercise, brought about PEH in medicated hypertensive older women. In both studies, the sessions were not performed with combined exercises and the intensities achieved were moderate to vigorous, which could explain the differences in results in relation to the present study.

Furthermore, the results observed in the present study are contrary to most previous studies that demonstrated a hypotensive effect in response to a combined exercise session15-18. Among these, the study by Ferrari et al.16 demonstrated that combined exercise caused acute PEH after one hour, similar to aerobic exercise performed on its own. Similarly, in the study by Anunciação et al., carried out with controlled hypertensive older women, it was found that aerobic and combined exercise sessions promoted significant reductions in SBP and DBP at 30, 60, 120 and 180 minutes post-exercise18. The different results observed between such studies and the present study could be explained by the divergence between the exercise protocols used, since the present study was unable to strictly control the intensity of the strength exercises.

Furthermore, Teixeira et al.19 evaluated young normotensive individuals who performed aerobic exercise at greater volume and at high intensities (75% of maximum VO2) during the session, which seems to be the most effective protocol for PEH5. It is important to note that the studies cited evaluated subjects with different characteristics from the sample of the present study and that none measured intensity using an accelerometer, making comparative analysis difficult.

Additionally, a study by Menêses et al.20, with medicated hypertensive women, evaluated the behavior of hemodynamic parameters for 30 minutes after a resistance exercise session at 50% of 1RM intensity and aerobic exercises between 50 and 60% of reserve HR. The results did not demonstrate statistically significant changes in SBP and DBP after exercise, similar to the findings of the present study. On the other hand, in the control session conducted in that study, significant increases were identified for both SBP and DBP. As in the present study, CO and PVR also remained unchanged in the study by Menêses et al.20. However, in contrast with what was observed in the present study, reductions in SV and increases in HR were observed.

In the present study, the behavior of post-exercise BP was not associated with CO and PVR among the older women who exhibited PEH. Literature, in turn, suggests that either of these variables, if not both, would explain PEH, but this tends to vary from person to person. As stated by Queiroz et al.21 PEH can be caused either by a reduction in PVR, or by a reduction in CO, which did not occur in the present study and prevented the finding of an association between BP responses and one or another determinant when the sample was analyzed as a set. In this context, Brito et al.9 found that CO is usually the most influential factor in untrained male individuals, who are older (consistent with the findings of the present study) with a higher BMI, while PVR usually has a greater effect in the opposite cases. Specifically in older individuals, the increase in arterial stiffness and the decrease in endothelial function associated with aging could make it difficult to reduce PVR after exercise.

It is possible that the occurrence of PEH observed in the aforementioned studies was due to the higher intensity of effort in the exercise sessions, which is notable even when considering that different methods for determining intensity were used. In addition, in these studies it was possible to control intensity with greater rigor, due to the previously performed tests, which meant that all participants should have expended equal effort. This was not possible in the present study, since interfering with the characteristics of the class did not form part of the proposal. Instead the objective was precisely to identify the intensity of the classes taught in the project analyzed, and whether they were sufficient to promote PEH, without prescribing or controlling the same.

From a practical point of view, the present study is relevant, since it evaluates, in the specific aspect of post-exercise BP behavior, a collective exercise class for older women, which can provide reflections for professionals who work in this area regarding how to guide such classes. Despite some individuals exhibiting PEH, it was found that, in the manner in which it was applied, the class did not provide optimal results in terms of BP reduction for the studied group, older hypertensive women, who, perhaps, are those who have the treatment of the condition as one of the primary motivations for adherence to the exercise program. In this sense, it may be useful to seek strategies to intensify the class, or to use a more rigorous method to control it. It is worth mentioning that, in addition to the specific benefit of PEH, it is likely that the class will have a positive effect on other components of physical fitness related to health, well-being and functional capacity. These requirements, however, were not assessed in the present study.

The present study has certain limitations which must be considered. For example, a control session was not carried out, and it was not possible to verify whether the exercise sessions prevented an increase in BP which, perhaps, would occur in the absence of exercise. In addition, between the end of the class and the beginning of the assessment, time was required to move and calibrate the equipment, which in general amounted to almost 20 minutes, and only following this were the 15, 30, 45 and 60 minutes post-exercise calculated. In other words, the time immediately after the exercise was not considered, unlike in cases in which the measurements are made by means of an automatic device, which compromises, to a certain degree, the moment-to-moment comparison of BP behavior with other studies that did not use the Finometer device. Furthermore, it should be noted that while accelerometry is currently considered a reference measure for physical activity, there are limitations regarding the evaluation of muscle strengthening activities22. It should also be considered that the older women used medications of different classes and took them at different times, a factor which was not assessed in the present study. The first case implies that hypertensive patients have their condition sustained, and therefore treated, through different mechanisms1 and, therefore, may have responded to the exercises differently. In the second case, individuals who took medication just before the session may have suffered interference from its more immediate effects.

Furthermore, there are still gaps in the scope of the acute and chronic effect of physical exercise on BP. It is suggested that future studies investigate whether there would be chronic adaptation in BP using this class model, even in the absence of PEH. In addition, it is suggested that it is investigated whether, during the 24 hour period following exercise, a hypotensive effect is manifested, in comparison to days without exercise.

CONCLUSION

Based on the results, it can be concluded that a single session of combined exercises performed in group classes was not able to promote PEH in hypertensive older women. The intensity of effort achieved in classes was, predominantly, low-light and considerable time was spent in sedentary behavior. In addition, the time spent on typically sedentary activities during sessions showed a positive correlation with changes in SBP. Therefore, in order to promote the beneficial effects of exercise on blood pressure levels in hypertensive older women, it is suggested that combined exercise programs, applied in the form of collective aerobics classes, be made up of higher intensity activities.

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No funding was received in relation to the present study.

Received: August 08, 2019; Accepted: April 02, 2020

Correspondence Juliana Cavestré Coneglian julianacavestre@gmail.com

The authors declare there are no conflicts of interest in relation to the present study.

Edited by:

Ana Carolina Lima Cavaletti

Creative Commons License This is an open-access article distributed under the terms of the Creative Commons Attribution License