HOME >> BIOLOGY >> NEWS
Inability to pump oxygen during exercise could pinpoint early heart problems

Mildly elevated blood pressure affecting millions of Americans could lead to heart pumping disorders if left untreated. A new Johns Hopkins study indicates that the amount of oxygen that can be circulated throughout the body during each heart beat while exercising could reveal to doctors early signs of heart trouble in this population.

The research, to be presented Oct. 17 at the annual meeting of the American Association of Cardiovascular and Pulmonary Rehabilitation (AACVPR) in Kansas City, should help physicians better follow patients with problems of the left ventricle, or main pumping chamber of the heart, by studying so-called oxygen pulse.

During exercise, lungs take in air and transfer oxygen to the blood, which is then pumped by the heart to the muscles that need it. Oxygen pulse is the amount of oxygen put through this process with each heart beat, and is a measure of cardiovascular efficiency.

Researchers studied 99 adults (44 men and 55 women) ages 55 to 75 who had mild hypertension but were otherwise healthy. The participants' blood pressures ranged from 130 mmHg to 159 mmHg systolic (the upper number) and 85 mmHg to 99 mmHg diastolic (the lower number). These levels are also known as "prehypertension" or "Stage I hypertension."

The Hopkins team measured the adults' heart size and performance at rest through traditional echocardiograms (or ultrasound), and tissue Doppler imaging, a newer ultrasound method that examines the functioning of the heart's walls. Next, they compared those results with the participants' heart performance during exercise while the adults walked on a treadmill. The scientists measured oxygen usage during the exercise portion by having the subject breathe through a mouthpiece attached to a valve that measures how much oxygen is used during the test.

Normally there is a sharp increase in oxygen pulse during the first few minutes of exercise. This rise continues with exercise, an
'"/>

Contact: Karen Blum
kblum@jhmi.edu
410-955-1534
Johns Hopkins Medical Institutions
17-Oct-2003


Page: 1 2

Related biology news :

1. Jefferson Scientists Find Evidence Of Potentially Infectious HIV In Semen, Despite Inability To Detect Active Virus In Blood
2. Researchers discover how worms noses sense oxygen
3. Researchers show absence of key oxygen-sensing molecule leads to developmental defects
4. Ultra-low oxygen could have triggered die-offs, spurred bird breathing system
5. Heart may heal with help from oxygen-sensitive genes, new study suggests
6. Cells ability to live without oxygen give clues for treating major diseases
7. U-Iowa scientists gain insight on how enzyme uses oxygen to produce useful chemicals
8. Topical oxygen helps hard-to-heal wounds heal faster and better
9. Too much oxygen on the cell biology bench? New study suggests so
10. Tibetans retain resistance to the oxygen-deficient disorder hypoxia regardless of altitude
11. Study shows deoxygenating ballast water can prevent invasive species and ship corrosion

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/3/2016)... MONTEREY, Calif. , March 3, 2016  FlexTech, ... in the categories of Innovation, Research & Development, Leadership ... Industry Leadership. This is the 9 th year ... select group of companies and individuals from past ... nominations based on a pre-described set of criteria, by ...
(Date:3/2/2016)... March 2, 2016 ... addition of the  "Global Biometrics Market in ... ,     (Logo: http://photos.prnewswire.com/prnh/20130307/600769) , , Global biometrics ... at a CAGR of around 27%   ... has announced the addition of the  "Global ...
(Date:3/1/2016)... SAN FRANCISCO , March 1, 2016  (RSAC ... every year, but a whopping $118 billion is lost ... due to overzealous and inaccurate fraud detection. At the ... shift in the way companies handle authentication by devaluing ... biometric and behavioral analytics. --> ...
Breaking Biology News(10 mins):
(Date:5/4/2016)... ... 04, 2016 , ... The Children’s Tumor Foundation announced its annual month-long campaign ... on nerves throughout the body. It affects 1 in 3,000 people of all populations; ... the month of May, as well as online activities, Neurofibromatosis Awareness Month and “I ...
(Date:5/3/2016)... , May 3, 2016 ... Chip (Genomics, Drug Discovery, Gene Expression) Lab-on-a-chip ... user (Academics Institutes, Diagnostics Centers), Fabrication Technology ... by MarketsandMarkets, the market is expected to ... USD 7.63 Billion in 2015, growing at ...
(Date:5/3/2016)... ... May 03, 2016 , ... Flagship Biosciences, ... Nancy Gillett to its Board of Directors. Dr. Gillett recently retired from Charles ... Vice President and Chief Scientific Officer. A board-certified veterinary pathologist, Dr. Gillett joined ...
(Date:5/3/2016)... WOODLANDS, Texas , May 3, 2016  Dr. ... certified plastic surgeon in The Woodlands, Texas ... that destroys 24 percent of treated fat cells in ... and woman. Close to 90 percent of Americans report ... treatment options. Nonsurgical fat reduction procedures are a growing ...
Breaking Biology Technology:
Cached News: