EFEITO DO COMPONENTE AERÓBICO NO TREINAMENTO COMBINADO SOBRE A PRESSÃO ARTERIAL DE IDOSAS HIPERTENSAS

rbme Revista Brasileira de Medicina do Esporte Rev Bras Med Esporte 1517-8692 1806-9940 Sociedade Brasileira de Medicina do Exercício e do Esporte RESUMO Introdução O treinamento aeróbico (TA), de força (TF) e combinado (TC) já são bem conhecidos como método de tratamento e controle da hipertensão arterial (HA), levando a alterações positivas na redução da pressão arterial (PA), fenômeno denominado hipotensão pós-exercício (HPE). Porém, persistem dúvidas quanto à ordem do treinamento combinado para promoção da HPE. Objetivo Verificar o efeito da ordem do componente aeróbico no treinamento combinado na HPE em idosas hipertensas. Métodos Ensaio clínico randomizado composto por 24 idosas hipertensas, distribuídas em três grupos de treinamento: Grupo 1 – Treinamento Aeróbico + Força (TA+TF), Grupo 2 – Treinamento de Força + Aeróbico (TF+TA) e Grupo 3 – Treinamento Aeróbico + Força + Aeróbico (TA+TF+TA). As participantes foram submetidas ao TA com intensidade de 60% da frequência cardíaca de reserva durante 30 minutos e ao TF com quatro exercícios, em três séries de 12 repetições, a 60% de uma repetição máxima (1RM) também de 30 minutos. Os treinamentos foram realizados ao longo de 24 sessões (três vezes por semana), sendo aferidas a pressão arterial sistólica (PAS) e diastólica (PAD) em todos os grupos, nos períodos antes e após cada sessão, e calculada a PA média (PAM). Resultados As variáveis analisadas não diferiram significativamente entre os grupos, nem no período pré-, nem no pós-treino. A PAM apresentou redução significativa apenas no G1. Porém, o G3 teve efeito maior sobre todas as variáveis analisadas. Conclusão O treinamento combinado com aeróbico fracionado (G3) gerou grande efeito hipotensor pós-exercício ao longo das 24 sessões, sendo indicado para o público de idosas hipertensas. Nível de evidência II; Estudos terapêuticos. INTRODUCTION Arterial hypertension (AH) can be defined as a syndrome of multifactorial and multicausal origin with characteristics such as increased and sustained blood pressure values and other metabolic conditions.1 The prevention and non-drug treatment of AH consists of changes in lifestyle, including physical exercise, to control blood pressure levels.2 Physical exercise can contribute to a reduction in blood pressure (BP)3 by generating a temporary decrease in tension, even after a single exercise session, due to the phenomenon called post-exercise hypotension (PEH).4 According to Bermudes et al.,5 factors such as intensity, duration, and type of exercise performed, along with resting blood pressure levels, may influence the amplitude and duration of PEH, allowing different responses in the cardiovascular system, significantly modifying the BP in the acute, subacute, and chronic post-exercise effects.6 Aerobic training (AT) and strength training (ST) promote significant improvements in the maintenance and reduction of BP levels.7 According to Sharman and Stowasser,8 AT causes important autonomic and hemodynamic changes that can act on the cardiovascular system, preserving cellular homeostasis in the event of an increase in metabolic demands promoted by hypertension. These same authors also reported that resistance training, as well as AT, improves hypotensive results. According to Vieira and Queiroz,9 despite the differences between ST protocols for hypertensive elderly patients, such training provided a reduction in resting BP in approximately 94% of the studies analyzed. This influence of ST on vascular behavior is mainly related to an improvement in cardiac functional capacity, in which there is an increase in ejection volume and a decrease in cardiac output and heart rate, in addition to double product reduction. In the long term, these hemodynamic changes will decrease peripheral vascular resistance through vasodilator substances, as well as blood pressure, as it is already clear from the literature that the major factor for hypertension is peripheral vascular resistance.10 The combination of AT and ST in the same session, defined as combined training (CT),11 has been used as an alternative for the improvement of cardiac blood pressure variables in adult and elderly men and women.12 According to Corso et al.,13 CT can be a strategy for the reduction of blood pressure in hypertensive elderly patients. Further comparative studies are needed to understand the training sequence and its contributions to the control and treatment of BP abnormalities in this population. Thus, the present study aims to verify the effect of the order of the CT on PEH in elderly hypertensive women. METHODS Sample and Experimental Design This clinical trial’s protocol was approved by the Ethics Committee on Research with Human Beings of the Health Sciences Center of the Federal University of Pernambuco (CEP/CCS/UFPE), under number CAAE-02990.172.000-11. Twenty-four elderly hypertensive women (64.03 ± 0.19 years of age) were selected, based on the diagnosis, who were physically active and had no musculoskeletal or cognitive limitations or any other disease that could prevent the execution or continuity of the training. The elderly women were not engaged in other exercise programs during the research intervention. All elderly women used only thiazide diuretics, calcium channel blockers (dihydropyridines), and angiotensin II receptor antagonists. However, the control of the drugs were not homogenous. Elderly hypertensive women who used beta-blockers, which affect cardiovascular response, and thus, would hinder the interpretation of data and the use of heart rate for the prescription of training, were excluded. All women were informed about every procedure used and agreed voluntarily by signing the informed consent form. Three treatment groups were formed: Group 1 - aerobic/strength training (AST), Group 2 - strength/aerobic training (SAT), and Group 3 - aerobic/strength/aerobic training (ASAT), where the distribution in the groups was determined using random allocation (the order of arrival). Questionnaires and Anthropometric Assessments The elderly women responded to an anamnesis, with personal information (i.e., name; age; race; and health, nutritional, and orthopedic history). Anthropometric data such as body mass, height, and skin fold thickness, measured with the aid of a scale with a coupled stadiometer (Welmy W110H LED display) and a CESCORF scientific adipometer, using the Siri calculation of body density14 and the Jackson and Pollock fat percentage protocol,15 were evaluated. Hemodynamic Variables Measurements During the auscultatory intervention, BP measurements were taken five minutes before and after each training session. Cardiorespiratory Test Cardiorespiratory parameters were obtained through the submaximal exercise stress test (EST), and a prior orientation was provided asking the participants to not perform any other physical exercises or suspend any drugs related to BP control. In addition, the consumption of stimulants such as soda, coffee, and tea was prohibited. Participants were also instructed to have a light meal two to three hours prior to EST. Furthermore, the Santos protocol,16 adapted to use a treadmill (the protocol originally suggested a cycle ergometer), was used, employing the method validated by Swain et al.17 and the ACSM metabolic equation18 for running. One-repetition maximum test (1RM) Strength protocols were performed on two separate days, with a 48-hour interval between them. On the first day, the vertical bench press and leg press tests were performed, and on the other day, the rowing and extender tests were performed. The protocol used was given by the American College of Sports Medicine (ACSM),19 which initially consisted of a warm-up with ten repetitions of a light load; after five minutes, 1RM load tests were performed. Five attempts were assessed for each exercise, with an interval of five minutes between each, taking into account the largest load used for a complete repetition by the individual. Intervention Procedures The elderly women were evaluated at baseline (pre-) and at the end of eight weeks of training (post-). All data collection was performed at the Department of Physical Education at the Professor José César de Albuquerque Farias Laboratory Complex. The intervention consisted of 24 training sessions, with a frequency of three weekly sessions (Mondays, Wednesdays, and Fridays). In all sessions, SBP and DBP at rest were measured five minutes before the exercise and at the end of each session after the participants had remained in post-exercise recovery in a sitting position for five minutes. In the AT protocol, the sessions consisted of 30 minutes of walking at 60% of the resting pulse rate (RPR) monitored using a frequency meter (Polar®, model FT7) on a treadmill.20 The ET protocol lasted 30 minutes and consisted of four exercises (horizontal leg press, low row, extensor chair, and seated machine bench press). Three sets of 12 repetitions at 60% of 1RM were performed with a 90-second rest between sets and 120 seconds between exercises.21 All groups were monitored using an adapted Borg scale.22 The three training groups were allocated as follows: Group 1 - aerobic/strength training (AST) Sessions began with aerobic training, with 30 minutes of continuous walking at 60% of RPR; then four exercises were performed (horizontal leg press, low row, chair, and seated machine bench press), with three sets of 12 repetitions at 60% of 1RM, a 90-second rest between sets, and 120 seconds between exercises (lasting 30 minutes). Group 2 - strength/aerobic training (SAT) The sessions started with strength training with four exercises (horizontal leg press, low row, extensor chair, seated machine bench press) performed in three sets of 12 60% 1RM repetitions with a 90-second rest between sets and 120 seconds between exercises (with an average duration of 30 minutes), immediately followed by 30 continuous minutes of walking at 60% of RPR. Group 3 - aerobic/strength/aerobic training (ASAT) The sessions started with aerobic training with 15 minutes of running at the same intensity described previously, followed by the strength training, and ending with another 15 minutes of continuous walking. Statistical analysis For the variables of systolic, diastolic, and mean blood pressure, the Shapiro-Wilk normality test was used and, subsequently, the t-test (p ≤ 0.05) was performed for paired samples to detect possible differences between pre- and post-training evaluation, after stratification in the training groups. Effect size (ES) analysis between pre- and post-training time in the different groups was performed using Cohen’s dm index for paired samples,23 with the following interpretations: <0.19 not significant; 0.20–0.49 small; 0.50–0.79 medium; 0.80–1.29 large; and >1.3 very large. For comparison between the groups, the variables were submitted to analysis of variance (ANOVA) and the means compared by the Tukey test with a 5% significance level. The root mean square standardized effect (RMSSE) index, in accordance with Steiger and Fouladi (2016), was calculated.24 The interpretations of the indices obtained were performed according to Cohen’s scale (1988),23 as above. The software used for analysis was Statistical Package for Social Sciences v.23. RESULTS Initially, 30 hypertensive elderly women were selected. However, six individuals were excluded, two for not attending the training sessions and four due to illness. Adherence among the other participants in the program was high (>95%). Table 1 presents the characteristics of the participants as mean and standard deviation. When analyzing the BMI and % fat, we noted that all the elderly persons evaluated were overweight; however, they were classified as having good cardiorespiratory capacity. Table 1 Characteristics of the elderly women evaluated by group. Variables G1 G2 G3 M (SD) M (SD) M (SD) Age 66.26 (5.12) 63.10 (3.02) 61.31 (3.24) Body mass (kg) 65.76 (3.49) 62.38 (8.32) 70.30 (7.57) Height (m) 1.60 (0.02) 1.61 (0.04) 1.59 (0.03) BMI (kg/m2) 25.27 (2.24) 26.44 (0.07) 28.07 (1.60) % Fat 28.16 (0.55) 26.02 (4.87) 28.40 (7.41) VO2 max (mL/kg/min) 39.00 (7.08) 38.22 (4.55) 40.40 (3.71) RPR (bpm) 70.60 (7.63) 60.50 (5.51) 71.16 (4.81) G1—aerobic/strength training (AST); G2—strength/aerobic training (SAT); G3—aerobic/strength/aerobic training (ASAT); BMI = body mass index; % fat = percentage of body fat; VO2 max = maximum oxygen volume; RPR = resting pulse rate; M = mean; SD = standard deviation. Table 2 presents the results of the comparison of hemodynamic variables of the hypertensive elderly women after 24 training sessions. There was no significant difference in hemodynamic variables in any of the groups when comparing the pre- and post-training parameters, except for MBP in G1 presenting a reduction of 10.8 mmHg. All parameters of G3 were reduced at 18.84 mmHg, 17.80 mmHg, and 14.96 mmHg for SBP, DBP, and MBP, respectively. This variation observed in G3 was also consistent with the large effect size in this group between pre- and post-training for all variables analyzed. Table 2 Comparison of pre- and post-training hemodynamic variables of the three groups of hypertensive elderly women undergoing different training interventions. G1 (SAT) G2 (TSA) G3 (ASAT) p RMSSE SBP (mmHg) pre- workout 113.80 ± 7.10 130.40 ± 23.47 142.96 ± 20.91 0.16 0.820 (large) post- training 113.40 ± 4.77 133.40 ± 7.82 124.12 ± 9.95 0.24 0.845 (large) p 0.93 0.20 0.18 Cohen's dm 0.067 (insignificant) 0.192 (insignificant) 1.221 (large) DBP (mmHg) pre- workout 57.40 ± 14.35 71.00 ± 7.69 79.48 ± 19.48 0.27 0.662 (medium) post- training 53.33 ± 21.83 71.40 ± 6.50 61.68 ± 11.07 0.43 0.627 (medium) p 0.60 0.93 0.08 Cohen's dm 0.225 (small) 0.056 (insignificant) 1.165 (large) MBP (mmHg) pre- workout 77.33 ± 12.11 88.30 ± 11.73 98.40 ± 15.42 0.19 0.771 (medium) post- training 66.53 ± 12.46 89.40 ± 8.76 83.44 ± 7.92 0.06 1.242 (large) p 0.00 0.69 0.12 Cohen's dm 0.879 (large) 0.107 (insignificant) 1.282 (large) G1 - aerobic/strength training (AST); G2 - strength/aerobic training (SAT); G3 - aerobic/strength/aerobic training (ASAT); SBP = systolic blood pressure; DBP = diastolic blood pressure; MBP = mean blood pressure. The values presented are means followed by the standard deviation analyzed between the pre and post training by t-test (p ≤ 0.05) for the same group and ANOVA (p ≤ 0.05) for between-group comparisons. RMSSE (Root Mean Square Standardized Effect) values and Cohen’s dm values are effect size (ES) indices. Through the simultaneous analysis of the groups, it was possible to observe a significant effect on SBP, both before and after training, as well as on the post-training MBP (Table 2). DBP, measured both before and after training, showed a medium effect in the groups analyzed (Table 2). DISCUSSION Through the data obtained in the present study, it was possible to verify the effect of the order of training in CT on PEH. This is the first study to analyze the effect of a CT intervention in a hypertensive elderly population. The results of the present study show a significant decrease in MBP in G1. This result corroborates that reported by Santos et al.,25 who analyzed hypertensive elderly women over the course of 16 weeks. Regarding the SBP and DBP for all groups, there was no significant difference. This is in contrast to other studies that analyzed BP in terms of the acute7 and chronic effects of CT.7 According to or statistical analysis, regardless of the order of training in CT, no PEH was noted. These results were similar to those reported by Teixeira et al.26 and Davitt et al.27 In the present study, this can be explained by the small sample size of each group, as well as the lack of homogeneity in drug control. However, these results are not consistent with those of Cadore et al.,28 who analyzed normotensive elderly individuals and confirmed that ST should be performed before AT, since this sequence promotes greater neuromuscular adaptation ensuring greater benefits in terms of functional capacity in this population. Although no significant difference was observed between the groups, effect size analysis showed that G3 showed a substantial effect on all variables assessed when compared to the other groups. These results differ from those of Park et al.,29 who analyzed prehypertensive individuals who performed walking exercises in a fractional manner (three to four 10-minute sessions with recovery intervals (50–40 minutes total) and continuous exercise (30–40 minutes), with 50% intensity of VO2 peak. However, these divergent results may be attributable to the different protocols employed in the two studies. These results underscore the importance of analyses taking into account the effects of training, especially on BP parameters, since a reduction by two to three mmHg in both SBP and DBP may reduce the risk of cardiac complications by up to 20%.30 Therefore, it is important to analyze the effect size. The increase in SBP after ST is mainly due to the increase in cardiac output (CO) promoted by the increase in catecholamines and endothelin during activity.30 SBP is of great importance in hypotension, because the higher the SBP values, the higher the hypotensive response.9 Dynamic resistance training causes SBP elevation; it however has positive consequences and enables greater adaptations in the PEH effect. Thus, several studies seek to understand the hypotensive effects of resistance training.29 AT is also involved in the enhancement of PEH, mainly due to the recruitment of large muscle groups to perform aerobic exercise—which provides improvements in hypotensive responses12 associated with cardiorespiratory, vascular, and metabolic changes—since this result is closely related to the reduction in CO resulting from resting bradycardia.19 The use of AT is consistent with certain studies in the literature that demonstrate the significant effect of this training on BP control.20 A previous study, evaluating hypertensive subjects undergoing CT, also reported results regarding PEH in the subjects analyzed,13 corroborating the findings of the present study. Thus, after training with varying order of exercises, hypertensive elderly women seem to show PEH. However, there is still no consensus on the appropriate dose-response relationship to ensure better benefits in terms of BP parameters in this population (e.g., relationship between intensity, duration, mode of execution, volume, and muscle mass involved).10 The greater cardiovascular responses noted with aerobic and strength exercises are partly due to peripheral and central mechanisms underlying autonomic modulation, respectively.8 In aerobic exercise, a change in sympathetic modulation (decrease in sympathetic tone and increase in parasympathetic tone) as a result of hypertension has been shown to be associated with an exacerbated activation of the sympathetic autonomic system at rest.1 In strength exercise, the afferent muscular nerves are stimulated by mechanisms associated with mechanical reflex and metaboreflex controls. The present study compared between the effects of the order of training (aerobic and strength) on BP parameters in hypertensive elderly women, since the literature on this subject is still scarce. Moreover, based on our findings, it is recommended that AT is split for CT as in G3 in this study and common practice in training centers. The lack of homogeneity in terms of the number of participants in each group after randomization and drug control are the main limitations of this study and preclude further conclusions about PEH. CONCLUSION The study reinforces the benefits of CT for hypertensive elderly women, concluding that the use of aerobic and strength training with fractionation of aerobic training over the course of 24 sessions generated a large hypotensive effect after exercise and may be recommended for the elderly hypertensive population. 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