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:
(Date:4/17/2014)... Mo. April 17 In the most densely forested ... forests reflect two centuries of human needs, values and ... and clearing forests for agriculture and development, have set ... a U.S. Forest Service study reports. , The report ... conditions and management needs in the Northern United States ...
(Date:4/17/2014)... Rochelle, NY, April 17, 2014The development of stem cell ... the ability to characterize stem cell populations based on ... have discovered a new marker that is highly expressed ... umbilical cord blood, which they describe in an article ... from Mary Ann Liebert, Inc., publishers. The article is ...
(Date:4/17/2014)... ALBUQUERQUE, N.M. A credit-card-sized anthrax detection cartridge developed ... small business makes testing safer, easier, faster and cheaper. ... causes anthrax, is commonly found in soils all over ... illness in both humans and animals. The bacteria can ... to B. anthracis may occur through skin ...
Breaking Biology News(10 mins):Five anthropogenic factors that will radically alter northern forests in 50 years 2Five anthropogenic factors that will radically alter northern forests in 50 years 3Pocket-sized anthrax detector aids global agriculture 2Pocket-sized anthrax detector aids global agriculture 3
(Date:1/15/2014)... 2014 The Pittcon Organizing Committee is pleased ... Safety Tech , an e-Journal and producer of ... the second year for the co-location of Food Labs Conference ... provides that the registration fee to attend the two-day Food ...
(Date:1/15/2014)... Jan. 15, 2014 ­ RedBrick Health , a ... technology, today announces that EmblemHealth , the ... company, is now providing the RedBrick Compass health assessment, ... to all of its members. EmblemHealth is among the ...
(Date:1/15/2014)... The Microcompetition with Foreign DNA theory explains how latent viruses ... is the Epstein Barr Virus (EBV), and one of these ... chronic inflammatory disease that destroys the body’s joints. As predicted ... high concentrations of EBV DNA in their bodies (1). ...
(Date:1/15/2014)... 2014 TaiGen Biotechnology Company, Limited ("TaiGen") today announced ... a leading Russian pharmaceutical company, to develop and commercialize ... Federation , Turkey and ... a novel antibiotic for the treatment of bacterial infections ...
Breaking Biology Technology:Pittcon Announces Second Year Partnership With Food Safety Tech 2Pittcon Announces Second Year Partnership With Food Safety Tech 3EmblemHealth Selects RedBrick Health to Power its Next-Generation Health Engagement and Behavior Change System 2EmblemHealth Selects RedBrick Health to Power its Next-Generation Health Engagement and Behavior Change System 3Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 2Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 2TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 4
Cached News: