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:8/19/2015)... , Aug. 19, 2015  VOXX International Corporation ... has entered into a Definitive Agreement to purchase ... iris authentication market leader EyeLock through an acquiring ... have a controlling interest in the acquiring entity. ... completion of due diligence.  Expanding on its existing ...
(Date:8/12/2015)... Minn. , Aug. 12, 2015   MedNet ... supports the entire spectrum of clinical research, is proud ... , the company,s comprehensive SaaS-based eClinical technology platform, has ... during the first two quarters of 2015.   Q2 ... second largest quarters measured by contract value sold in ...
(Date:8/11/2015)... Today, ZUK announced its Android smartphone Z1, ... expected revenues in 2015 that relate to sales of FPC1155 for ... approximately 2,200 MSEK for 2015. Jörgen Lantto, CEO of ... smartphone manufacturer in China and ... 155 for Z1 , ...
Breaking Biology News(10 mins):VOXX International Corporation Signs Definitive Agreement To Acquire The Assets And A Controlling Interest Of Biometric Leader EyeLock 2VOXX International Corporation Signs Definitive Agreement To Acquire The Assets And A Controlling Interest Of Biometric Leader EyeLock 3VOXX International Corporation Signs Definitive Agreement To Acquire The Assets And A Controlling Interest Of Biometric Leader EyeLock 4VOXX International Corporation Signs Definitive Agreement To Acquire The Assets And A Controlling Interest Of Biometric Leader EyeLock 5MedNet Solutions Experiences Explosive Corporate Growth 2FPC's Touch Fingerprint Sensor FPC1155 in ZUK's Smartphone Z1 2
(Date:8/31/2015)... Trimb Healthcare AB ("Trimb") today announced that ... BV ("YouMedical"), a Dutch OTC company with operations in ... approximately EUR 16 million, with solid growth and leading ... is to build a leading international OTC company, and ... YouMedical gives us a stronger North European OTC platform, ...
(Date:8/30/2015)... , August 31, 2015 ... einer Frau   für chirurgische   Behandlung     ... 7-90   werden für eine   verheerende   ... Frauen behandeln und die Anzahl ausgebildeter Chirurgen in Kenia ... Astellas gab heute bekannt, dass  Action on Fistula  seit ...
(Date:8/28/2015)... , Aug. 28, 2015 /PRNewswire/ - RepliCel ... stage regenerative medicine company focused on the development ... for the quarter ended June 30, 2015, corporate ... and management report are available at www.sedar.com ... . "RepliCel expects to launch ...
(Date:8/27/2015)... 27, 2015  Neogen Corporation (NASDAQ: NEOG ) ... United Kingdom -based Lab M Holdings, ... and diagnostic systems. Lab M was ... provider of microbial testing and diagnostic products for the ... company currently sells into more than 70 countries worldwide, ...
Breaking Biology Technology:Über 550 Frauen, deren Leben durch "Action on Fistula" transformiert wurde 2Über 550 Frauen, deren Leben durch "Action on Fistula" transformiert wurde 3Über 550 Frauen, deren Leben durch "Action on Fistula" transformiert wurde 4Über 550 Frauen, deren Leben durch "Action on Fistula" transformiert wurde 5RepliCel Reports Second Quarter 2015 Financial Results 2RepliCel Reports Second Quarter 2015 Financial Results 3RepliCel Reports Second Quarter 2015 Financial Results 4RepliCel Reports Second Quarter 2015 Financial Results 5Neogen acquires U.K.-based Lab M Holdings 2
Cached News: