Strength training protects against high blood pressure

weight-lifting

If you have high blood pressure, many doctors and patients think you shouldn’t be doing strength training. This is not the case write researchers at the Catholic University of Brasilia in an article that will soon be published in the Journal of Strength and Conditioning Research. The researchers say strength training actually has a positive effect on people with high blood pressure.

Exercise can help prevent high blood pressure, and people who already have high blood pressure can reduce it a little by starting to do more exercise. [Clinics (Sao Paulo). 2010 Mar; 65(3): 317-25.] The indications that endurance exercise – for example, 40 minutes of cycling at an intensity of 60 percent VO2max – helps reduce blood pressure are strong.

Less is known about the effects of strength training on blood pressure, although we do know that, during sets with heavy weights, blood pressure can shoot up. For people with vulnerable blood vessels, the temporary peak in blood pressure may be too much, although there are studies that suggest that good breathing technique and the use of blood-pressure lowering medicines such as propranolol can help flatten off the peak ScientificWorldJournal. 2012; 2012:913271.].

We also know that blood pressure declines a little in the first hour after a strength-training session, in people with normal blood pressure and in those with raised blood pressure. [J Strength Cond Res. 2001 May; 15(2): 210-6.] This would suggest that strength training might have a positive effect on blood pressure.

The researchers wanted to know what the effect of strength training would be on women with high blood pressure who were taking medication for this. Would strength training have a positive effect? Or would the women be better off doing moderately intensive forms of exercise?

To answer this question the researchers got 32 women aged between 60 and 75, all of whom had high blood pressure, to do strength training three times a week for four months [EG].

The women trained the main muscle groups each session, doing ten simple basic exercises: lat-pulldowns, leg-extensions, chest presses, hip abductions, leg curls, leg presses and calf raises. The women performed three sets of each exercise. They started off at 60 percent of the weight with which they could just manage 1 rep, and built this up gradually to 80 percent.

A control group did no training at all [CG].

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When the women were not taking medication against high blood pressure, their systolic pressure [pressure during the heart beat] was above 140 mmHg and their diastolic pressure [the pressure between two heart beats] was above 90 mmHg.

The first table below shows that the resting systolic blood pressure in the experimental group decreased by 14.3 mmHg. This was a statistically significant effect. The second table shows that the diastolic resting blood pressure went down by 3.6 mmHg. The effect was not quite significant.

2

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So women with high blood pressure that is under control can happily do strength training the researchers conclude. They must be sure to gradually increase the weight they work with.

Careful strength training can even help to keep blood pressure under control and may even help lower it. “Chronic reduction of resting blood pressure observed in this study may be translated as a significant protective effect on the volunteers cardiovascular system”, the Brazilians write.

ACUTE AND CHRONIC EFFECTS OF RESISTIVE EXERCISE ON BLOOD PRESSURE IN HYPERTENSIVE ELDERLY WOMEN.

Mota MR, Jacó de Oliveira R, Dutra MT, Pardono E, Terra DF, Lima RM, Simões HG, Martins da Silva F.

Source

aCatholic University of Brasília, UCB, Brasilia, DF, Brazil bUniversity Center of Brasília, UniCeub, Brasilia, DF, Brazil cUniversity of Brasília, Unb, Brasília, DF, Brazil dState Department of Education, Brasília, DF, Brazil eUniversity of Sergipe, UFS/DEF/NUPAFISE, Aracaju, Sergipe, Brazil.

Abstract

The purpose of this study was to investigate post-exercise hypotension (PEH) during a four-month period of resistance training in hypertensive elderly women. Sixty-four women were divided into two groups: an experimental group (EG), which performed resistance training, and a control group that did not practice any exercise. The experimental group carried out the following steps: 1) three weeks of exercise adaptation and 1RM test (month #1); 2) resistance exercise at 60% 1RM (month #2); 3) resistance exercise at 70% 1RM (month #3); 4) resistance exercise at 80% 1RM (month #4); 5) PEH analyses at the end of each month. Measurements of systolic (SBP) and diastolic (DBP) blood pressure (BP) were performed each 5 minutes during a 20min resting period prior to the sessions and each 15min during one hour of post-session recovery. ANCOVA for repeated measures showed a reduction in SBP of about 14mmHg (p ? 0.05) and in DBP of 3.6 mmHg (p ? 0.05) between resting values after the training period. In the EG group, SBP showed acute PEH during months 2 and 3, while DBP showed acute PEH during months 2 and 4. The control group did not show acute PEH or variations during the four months period. PEH occurrence and chronic reduction of resting BP observed in the experimental group may have a protective effect on the cardiovascular system of the study participants.

PMID: 23478476 [PubMed – as supplied by publisher]

Source: http://www.ncbi.nlm.nih.gov/pubmed/23478476
 

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