Slow breathing and blood pressure

Understanding the way people breathe might explain how the body regulates blood pressure and much else.

Photo: Slow breathing and blood pressure
USA – High blood pressure increases the risk of heart attacks and strokes, and can cause kidney damage, blindness and dementia. Constant under-breathing and a high salt intake might lower the ability of the kidneys to release the salt – which is estimated to be eaten over double the highest recommended limit by Americans. Thus, understanding the way people breathe might explain how the body regulates blood pressure and much else.

Scientists do not fully understand what causes hypertension. To this end, Dr David Anderson, chief of research into behaviour and hypertension at the National Institutes of Health’s National Institute on Aging, is using a device – RESPeRATE – to ‘train’ volunteers suffering hypertension to breathe slowly.

In 2002, the device received FDA approval for non-prescription sale as an aid to help lower blood pressure by pacing breathing. It counts breaths by sensing chest or abdominal movements and makes gradually slowing sounds to signal when the user should inhale and exhale. The sounds are followed until the user’s breathing slows from around 16 to 19 breaths a minute to 10 or less.
In earlier clinical trials, volunteers who used the device for 15 minutes daily, over a two-month period, were reported to have lowered blood pressure 10–15 points. Dr Anderson pointed out that although slow, deep breathing can relax and dilate blood vessels, this is temporary, so does not explain the longer-term effect after using the device. He is now testing a theory that, when under chronic stress, people’s breathing can become ‘inhibitory’, meaning they shallow breath, unconsciously holding their breaths; this in turn diverts more blood to the brain to increase alertness, but that interferes with the chemical balance of the blood. Increased acidity in the blood decreases kidney efficient excretion of sodium – seen in animal studies.

30.08.2006

More on the subject:

Related articles

Photo

News • Neural network-based assessment

AI calculates biological heart age, cardiovascular risk, from ECG data

By using AI to analyse ECG data, researchers created an algorithm to predict the biological age of the heart. This could be used to identify those most at risk of cardiovascular events and mortality.

Photo

News • Cardiac event marker

Coronary artery calcium score: useful regardless of age

A large new study of more than 40,000 patients finds that a zero coronary artery calcium score continues to be an accurate indicator of a low risk for a coronary heart event even as a person ages.

Photo

News • Mortality, CVD, cancer, and more

Weight loss protects (even when it's regained)

Losing weight is a great way to improve one's overall health. But, are these benefits gone once a person is gaining weight again? Not necessarily, a new study points out.

Related products

Subscribe to Newsletter