Effect of Peripheral Heart Action on Body Composition and Blood Pressure in Women with High Blood Pressure

AUTHORS

Maghsoud Nabilpour 1 , * , Jerry Mayhew 2

AUTHORS INFORMATION

1 Department of Sport Sciences, Imam Khomeini International University, Qazvin, Iran

2 Department of Health and Exercise Sciences, Kirksville, Missouri, United States

ARTICLE INFORMATION

International journal of Sport Studies for Health: 1 (2); e81874
Published Online: July 22, 2018
Article Type: Research Article
Received: July 8, 2016
Accepted: July 16, 2018
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Abstract

Objectives: Exercise is non-medical treatment and low-risk strategy for people with hypertension. Therefore, the aim of this study was to evaluate the effect of peripheral heart action (PHA) on body composition and blood pressure in women with high blood pressure.

Methods: Twenty women (age = 38 - 46 years, BMI = 21 - 31 kg/m2) who had high blood pressure (135/88 mm Hg) volunteered to participate. Ten were randomly selected and submitted to 32 PHA exercise sessions. The remaining 10 participants served as a non-exercise control group. Systolic (SBP) and diastolic blood pressure (DBP), skinfold, and 1RM tests of maximum strength were determined before and after 36 exercise sessions.

Results: SBP and DBP were decreased significantly (P < 0.05) in the PHA group but not in the non-exercise control group. Furthermore, the training group made significant improvements in test of one-repetition maximum and body composition compared to the control group (P < 0.05).

Conclusions: Resistance exercises using the PHA approach can be considered as a low-risk treatment for people with high blood pressure in order to improve blood pressure, increase muscular strength, and enhance overall fitness.

Keywords

Keywords: Resistance Training Hypertension Body Composition

Copyright © 2018, International Journal of Sport Studies for Health. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited
1. Background

Hypertension is a chronic cardiovascular disorder characterized by an increase in pulmonary vascular resistance which can lead to right ventricular failure (1). The prevalence of pulmonary hypertension is 10 - 15 per million, with a mortality rate of 15% per year (2). Over the past two decades, targeted therapies have been effective in reducing disease progression and improving survival among patients with pulmonary hypertension (3). However, improvements in targeted blood pressure treatments have their limits, and additional therapeutic strategies are needed to reduce mortality. In addition to pulmonary compilations, muscular disorders such as sarcopenia, fiber type change, and muscle contractions disorders are ancillary disabilities accompanying hypertension. Although previous research has shown that exercise may help improve dyspnea, reduce fatigue, and lower blood pressure (4), concerns have been expressed over the use of resistance exercises as part of a comprehensive exercise program to reduce cardiovascular disease risk in the elderly people (5) and in high-pressure populations (6, 7). These concerns focus on limiting the degree of this form of training since it may aggravate the progression of the disease and increase the risk of sudden death from a heart attack (7). However, from 2009 onwards, guidelines have been revised and include exercise as a suitable, stable, safe, and non-pharmacotherapy for patients with hypertension and chronic lung disease (8, 9). Recent investigations, however, have shown that resistance exercise can be incorporated in training programs of hypertensive individuals with significant results showing decrements (10, 11), increments (12), or no change (13, 14) in blood pressure levels. Accordingly, it would be advantageous to find a training method that can both support muscle hypertrophy and treat hypertension at the same time. Such a program might increase muscular strength and power and promote greater physical activity in hypertensive patients.

Researchers have examined the effect of variables such as volume, intensity, and exercise methods on blood pressure responses after a session of resistance activity and have reported positive results (15, 16). Resistance exercises with low intensity and short periods of rest between sets have been shown to reduce artery stiffness and improve vascular function by increasing arterial diameter of the rest (17). In addition, the intensity of resistance exercise has been shown to create a plasma shift from blood to the interstitial space to the same degree as seen in dynamic exercises such as biking (18). Rezk et al. (19), reported that resistance training causes a reduction in blood pressure in healthy people after exercise at both low and high intensities, which was similar to that seen in aerobic exercises. Factors such as the hemodynamic and metabolic responses relative to the amount of active muscle mass and regions in the arms and legs may affect the response of blood pressure after exercise (20). A training protocols designed by Steinhaus in 1940 specifically alternated exercise emphasis between upper and lower body without a break between the two conditions. The positive effects of limiting rest between upper- and lower-body exercises, termed peripheral heart action (PHA), were elucidated by Asmussen and Mazin (21). Their findings showed that active rest between stations had significant effects compared to passive rest. Piras et al. (2015) recently found that PHA training produced increases in muscle strength and vasovagal tone in a group of young men and women. These studies noted that this form of exercise can simultaneously increase strength, promote hypertrophy, and improve body composition, which can lead to a reduction in high blood pressure.

Women in the middle-age years may be particularly susceptible to high blood pressure as well as accompanying disorders of Osteoporosis and Sarcopenia which can lead to further deterioration in activities of daily living. Having considered the issue, studying the effect of PHA on older women with hypertension can be effective. Thus, the purpose of this study was to investigate the effect PHA training on middle-aged hypertensive women.

2. Methods

Twenty women with hypertension who had a history of blood pressure medications and were referred to the Turgan health center volunteered to participate in the research. Demographic charactristics are presented in Table 1. None of the participants had a history of regular resistance exercises for two years before the start of the study. Before testing, information was given about the training program and possible risks and discomforts associated with it. Each participant completed a written consent form. The study was approved by ethical committee of Imam Khomeini international university (License No. 17628) and complied with the declaration of Helsinki.

2.1. Procedures

Ten participants were randomly selected as a training group, with the remaining 10 serving as a control group. The control group was present in the facility health center but did not practice any special kind of exercise; and anthropometric tests were performed. All participants received some dietary advice and proper timing of food consumption.

Medical records and blood pressure of participants were evaluated by a sports physician. Systolic and diastolic blood pressure values and heart rate were measured after a 5-minute rest in a seated position in a chair. Systolic and diastolic pressures were determined three times per session during two separate sessions. In all sessions, blood pressure was measured using a standard sphygmomanometer and telephone gauge (ALPK2, Hangzhou Rollmed, Japan), by the first and fifth Korotkoff sounds as systolic and diastolic blood pressure, respectively. Skinfolds were measured with a slim guide caliper by an internationally certified technician using the criteria of international society for the advancement of kinanthropometry. Percent body fat (PBF) was estimated using a gender-specific prediction equation (22).

All participants participated in four separate days of familiarization for maximum muscle strength estimation (23). One-repetition maximum (1RM) was determined for shoulder press, bench press, leg extension, and seated leg curl. Also, each session of resistance training started with 12 minutes of warm up and finished with 5 minutes of cool-down. The arrangement of the stations was as follows: front of the arm stand, squat in the seat, back of the wristband, front of the car, and head of the barbell; after completing these five movements, the participants were given active rest for 2 to 3 minutes.

PHA training consisted of alternating between upper-body and lower-body exercises with no rests between exercises. In this study, the resistance training protocol consisted of push-ups, seated leg curl, back extension, seated calf raise, and seated cable row. Following a 2 - 3-minute rest, participants performed cable front raise, box stepping, EZ-bar preacher curl, and leg abductor machine. Following another 2 - 3-minute rest, participants completed incline bench press, walking lunge, latissimus pulldown, decline reverse crunch, and dumbbell lateral raise. Each station had 15 repetitions. The practice load at each station was determined to be between 55% and 60% of a maximum repetition using the Brzycki formula for estimating %1RM (24). In order to comply with the principle of overload, the workload was increased by 2 - 5% in each exercise every two weeks. Thirty-two training sessions were completed over a 10-week period.

The normal distribution of data (average and standard deviation) was assessed by the Shapiro-Wilk’s test. Comparisons between pre-test and post-test was performed using paired t-tests, while between-group comparisons were performed using independent t-test. Statistical analyses were performed with SPSS version 22 (IBM, Chicago, IL) at a significance level of 0.05.

3. Results

Resting heart rate, systolic and diastolic blood pressure values decreased significantly by 5.2%, 2.2%, and 3.2%, respectively, after 32 sessions of exercise in the PHA group compared to < 1% change in the control group (Table 1). In addition, 1RM strength performance in bench press, shoulder press, leg extension, and leg curl increased by 16.5%, 16.0%, 12.8%, and 17.1%, respectively, in the PHA group compared to decreases of 1.0 - 2.9% in the control group (Table 1).

Table 1. Comparison of Variables Between PHA and Control Groups Before and After Training
VariablePHA Group (n = 10)ESControl Group (n = 10)ES
Pre-TrainingPost-TrainingPre-TrainingPost-Training
Weight (kg)75.00 ± 7.3672.69 ± 6.530.3278.65 ± 6.6878.44 ± 6.500.03
BMI (kg/m2)26.2 ± 2.925.4 ± 2.70.2827.5 ± 2.027.5 ± 2.10.00
%Fat26.4 ± 2.823.1 ± 4.21.1826.7 ± 3.026.7 ± 3.10.00
Resting heart rate (bpm)80.3 ± 2.476.1 ± 2.9a1.7579.7 ± 3.179.3 ± 3.10.13
Systolic blood pressure (mm Hg)135.4 ± 4.6132.4 ± 3.5a0.65135.5 ± 4.8135.8 ± 4.70.06
Diastolic blood pressure (mm Hg)88.1 ± 4.585.3 ± 2.8a0.6286.5 ± 3.486.4 ± 3.40.03
Bench Press (kg)26.1 ± 6.730.4 ± 7.0a0.6424.3 ± 4.625.0 ± 4.20.15
Shoulder Press (kg)16.2 ± 2.318.8 ± 2.5a1.1317.2 ± 3.717.2 ±3.60.00
Leg Extension (kg)36.8 ± 8.041.5 ± 8.1a0.5938.3 ± 7.138.7 ± 6.20.06
Seated Leg Curl (kg)19.3 ± 4.422.6 ± 4.80.7520.9 ± 4.420.6 ± 4.20.07

Abbreviation: ES, effect size.

a p < 0.05.

As it can be seen in figure 1 and 2, both Systolic and Diastolic blood pressure were significantly decreased in PHA group compared to control group (p ≤ 0.05).

Systolic blood pressure index in PHA and control groups
Figure 1. Systolic blood pressure index in PHA and control groups
Diastolic blood pressure index in PHA and control groups
Figure 2. Diastolic blood pressure index in PHA and control groups

Independent T-test also indicated that body mass index (t = 2.20; P = 0.041), body fat percentage (t = 2.34; P = 0.034), systolic blood pressure (t = 2.25; P = 0.038) and strength in upper extremity (t = 2.14; P = 0.045) were significantly different in PHA group than control group.

4. Discussion

The aim of the present study was to evaluate the effect of PHA training on blood pressure, muscular strength, and body composition responses of hypertensive middle-aged women. The results showed this type of resistance exercise can have a significant effect on systolic and diastolic blood pressure as well as resting heart rate while performing with moderate loads. Recent studies have shown that resistance exercise can reduce blood pressure (1-3). However, few studies have explored the effect of PHA resistance exercise in hypertensive women. Rodriguez et al. (25) were unable to reduce post-exercise systolic and diastolic blood pressure when using traditional and tri-set resistance training methods. The traditional group rested one minute between sets of each exercise, while the tri-set group performed a sequence of different upper-body exercises without rest between sets. Blood pressures were measured periodically over a 90-minute period following exercise. It is difficult to compare their results with the current study since their participants were young males (19.7 ± 0.7 yrs) with normal resting blood pressures (115 - 125/72 - 77 mmHg). Piras et al. (2015) stated that PHA exercises have produced adaptations commensurate with high-intensity interval training exercises because the physiological stress can be applied for longer periods. Moderate load, high volume resistance training has been shown to reduce systolic blood pressure through increased parasympathetic activity (26, 27). Other possible mechanisms influencing hypotension after activity include decreased sympathetic neuropathy, increased cardiac outflow, and reduced peripheral vascular resistance (28).

A significant decrease in resting heart rate was shown in the PHA group. The percent change was similar to that noted in aerobic training (29). Cornelissen et al. (2010) found that higher intensity aerobic exercise produced a greater effect on cardiovascular function. Their participants performed running, cycling, and stepping at low- and high-intensity (33% and 66% of heart rate reserve, respectively) and showed comparable reductions in resting heart rate between the two groups (7.2% and 7.8%, respectively). Resting heart rate reduction by the PHA group in the current study was comparable (i.e., 5.2%), suggesting that PHA exercise can produce similar enhancement in heart function to traditional aerobic exercise.

The current results suggest that PHA is a form of exercise that can significantly increase muscular strength in middle-aged women. Bench Press (14.1%), shoulder press (13.8%), leg extension (11.3%), and seated leg curl (14.6%) showed comparable increases in 1RM performance to previous studies that used higher intensity resistance exercise protocols (30). In order to maintain continuous activity in PHA, the loads of the exercises are typically lower than those in traditional resistance training (31). The lighter loads utilized in the current study may be an advantage to avoid soreness and injury as well as promote routine participation.

The PHA exercise program created in this study resulted in a significant 3.3% reduction in PBF which can be one of the possible mechanisms for lowering blood pressure (32). However, studies in all weight loss patients did not show a decrease in blood pressure, and patients with definite lowering of blood pressure did not lose weight (25). However, it is likely that muscle hypertrophy has occurred at the same time as fat loss, and overall weight loss has not been achieved. In the present study, By decreasing BMI, muscle strength was improved. That is probably an indication of muscle hypertrophy and neuromuscular adaptations. With an increase in each unit of BMI, 8% increase in the probability of a heart attack can be found, and on the contrary, by increasing physical activity by one metric, the risk of cardiovascular disease decreases by 8% (30).

4.1. Conclusions

Resistance exercises using the PHA approach can be considered as a low-risk treatment for people with high blood pressure in order to improve blood pressure, increase muscular strength, and enhance overall fitness.

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