Home HealthFitness IMST is a Creative Way to Control Blood Pressure

IMST is a Creative Way to Control Blood Pressure

by Paul Ebeling

#breathing #exercise #IMST

A quick daily workout for the breathing muscles may help people lower their blood pressure to a similar degree as exercise or even medication, a study suggests.

The technique is called IMST (inspiratory muscle strength training), and it involves using a device that provides resistance as the user inhales essentially working out the diaphragm and other breathing muscles.

Researchers found that over 6 wks, the exercises lowered study participants’ blood pressure by 9 points, on average.

And all it took was 5 mins of training per day, said lead researcher Daniel Craighead, an assistant research professor at the University of Colorado, Boulder.

Study participants had higher-than-normal blood pressure but were healthy. It is unclear how well the technique would work for people in poorer health.

Also there is the Question of how long the benefits last, though this study turned up some encouraging results. Even after the training ended, most of the blood pressure reductions were sustained for another 6 wks.

There is something special about the breathing exercises, according to Mr. Craighead. “We’re excited to study it further,” he added.

The findings were recently published online in the Journal of the American Heart Association.

Inspiratory muscle strength training has been studied for lung conditions like asthma and emphysema and for boosting athletic endurance, according to Mr. Craighead, who uses the technique in his own marathon training.

But a recent trial found that for people with sleep apnea IMST also lowered blood pressure.

The Craighead’s team wanted to see whether the training could help people whose only health issue was elevated blood pressure.

The study was funded by the US National Institutes of Health and the American Heart Association (AHA), and involved 36 adults aged 50 to 79. All had above-normal systolic blood pressure (higher than 120 mm Hg). Systolic pressure is the force your blood exerts against artery walls when your heart beats.

The researchers randomly assigned participants to 1 of 2 groups: In one, participants used a hand-held device that provides resistance during inhalation similar to trying to suck through a tube that sucks back.

The other group performed a “sham” version of the exercise, using a device that provided little resistance.

It’s not relaxing, like slow deep breathing,” Mr. Craighead said of the real training. “It’s more like exercise.”

It’s a brief workout, 30 inhalations, or about 5 mins, per day.

After 6 wks, the study found, people in the IMST group saw their systolic blood pressure drop from an average of 135 mm Hg to 126 mm Hg.

The improvement is on par with Rx medication and even better than what’s typical with exercise.

It “would not be wise” to simply stop taking Rx blood pressure medications or exercising, said Dr. Karen Griffin, chairwoman of the AHA’s hypertension council.

She said the findings raise the possibility that IMST could bring added benefits, and even allow some people to take less medication. But Dr. Griffin agreed that further study is needed to see whether the exercises are as helpful for people with co-existing conditions like heart disease and diabetes.

As for why IMST helps lower blood pressure, it’s not yet clear.

But study participants in the IMST group showed certain measurable changes: an increase in nitric oxide, a chemical that helps dilate arteries, plus a decrease in C-reactive protein, a marker of inflammation in the blood vessels.

People interested in trying IMST for their high blood pressure should talk to their doctor first, according to Dr. Griffin.

“It’s always prudent to check with your physician,” she said, “although I suspect most healthy individuals would be able to add this to their daily routine without any significant health risk.”

Mr. Craighead said he does not see IMST as a replacement for whole-body exercise.

“If you can exercise, do it,” he said. “Exercise has many benefits other than blood pressure control.”

Eat healthy, Be healthy, Live lively, Breathe!

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