HOME >> MEDICINE >> NEWS
Caffeine limits blood flow to heart muscle during exercise

In healthy volunteers, the equivalent of two cups of coffee reduced the body's ability to boost blood flow to the heart muscle in response to exercise, and the effect was stronger when the participants were in a chamber simulating high altitude, according to a new study in the Jan. 17, 2006, issue of the Journal of the American College of Cardiology.

"Whenever we do a physical exercise, myocardial blood flow has to increase in order to match the increased need of oxygen. We found that caffeine may adversely affect this mechanism. It partly blunts the needed increase in flow," said Philipp A. Kaufmann, M.D., F.A.C.C., from the University Hospital Zurich and Center for Integrative Human Physiology CIHP in Zurich,.

The researchers, including lead author Mehdi Namdar, M.D., F.A.C.C., studied 18 young, healthy people who were regular coffee drinkers. The participants did not drink any coffee for 36 hours prior to the study testing. In one part of the study, PET scans that showed blood flow in the hearts of 10 participants were performed before and immediately after they rode a stationary exercise bicycle. In the second part of the study, the same type of myocardial blood-flow measurements were done in 8 participants who were in a chamber simulating the thin air at about 15,000 feet (4,500 meters) altitude. The high-altitude test was designed to mimic the way coronary artery disease deprives the heart muscle of sufficient oxygen. In both groups, the testing procedure was repeated 50 minutes after each participant swallowed a tablet containing 200 milligrams of caffeine, the equivalent of two cups of coffee.

The caffeine dose did not affect blood flow within the heart muscle while the participants were at rest. However, the blood flow measurements taken immediately after exercise were significantly lower after the participants had taken caffeine tablets. The effect was pronounced in the group in the high-altitude chamber.
'"/>

Contact: Amy Murphy
amurphy@acc.org
301-581-3476
American College of Cardiology
13-Jan-2006


Page: 1 2 3 4

Related medicine news :

1. New research explores limits of non-invasive coronary imaging tests
2. Defining the limits of computerized physician order entry systems
3. Study shows schizophrenia limits understanding of body language
4. A Jekyll and Hyde of cytokines: IL-25 both promotes and limits inflammatory diseases
5. Health professionals believe gender bias limits womens progression in NHS
6. Immune system lab model overcomes ethical limits on human hematopoietic stem cells studies
7. Even low levels of weekly exercise drive down blood pressure
8. Chemotherapy with bevacizumab increases risk of blood clots in arteries
9. High blood pressure problems largely misunderstood by sufferers
10. Trial stops after stroke and mortality significantly reduced by blood
11. Program announced to improve care in developing areas for patients with blood disorders

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Caffeine limits blood flow heart muscle during exercise

(Date:3/28/2015)... (PRWEB) March 28, 2015 Lately the ... media regarding recent changes and proposals around the NCAA. ... current and former collegiate student-athletes across a spectrum of ... reflect on common challenges. The special panel consists of ... in sports ranging from football, track and field, baseball, ...
(Date:3/28/2015)... California (PRWEB) March 28, 2015 Designers ... a new overlay entitled Scratches 5K from Pixel Film ... scratch effects to any media inside Final Cut Pro ... “StoryBoard Corporate saves time and is an effective tool ... using FCPX Overlay Scratches 5K's intuitive grunge overlays. Simply ...
(Date:3/28/2015)... LTW Cyber is an innovation hub for technology ... of addressing the needs of the global market for ... to grow while seeking collaborative opportunities with the other ... in LTW Cyber focus on secure application security, grounded ... and analyzing open source. As the hub matures, ...
(Date:3/27/2015)... Tampa, FL (PRWEB) March 27, 2015 Florida ... Bay Storm as the team’s exclusive health care provider for ... care provider, Florida Hospital provides medical care and an athletic ... Bay Storm will kick off its season against the Cleveland ... , “This partnership is extremely important to us as ...
(Date:3/27/2015)... (PRWEB) March 27, 2015 Top medical ... surgery patients travel to the Dominican Republic to benefit ... surgery clinic is turning the medical tourism industry upside-down ... patients — with trustworthy services becoming the central influence. ... a plastic surgeon. Patients are not only attracted to ...
Breaking Medicine News(10 mins):Health News:SCI TV Panel of Former College Athletes Discusses Student Athlete Experience 2Health News:SCI TV Panel of Former College Athletes Discusses Student Athlete Experience 3Health News:Pixel Film Studios Unveiled Scratches 5k for Final Cut Pro X Editors 2Health News:Canadian Cybersecurity Ventures Globalize as a Collective 2Health News:Canadian Cybersecurity Ventures Globalize as a Collective 3Health News:Florida Hospital Is Kicking off the 2015 Season as the Exclusive Health Care Provider for the Tampa Bay Storm 2Health News:Florida Hospital Is Kicking off the 2015 Season as the Exclusive Health Care Provider for the Tampa Bay Storm 3Health News:Dominican Republic Plastic Surgery Provider Turning Medical Tourism Upside-Down 2Health News:Dominican Republic Plastic Surgery Provider Turning Medical Tourism Upside-Down 3
(Date:3/27/2015)...   Hospira, Inc. (NYSE: HSP ... world,s leading provider of injectable drugs and infusion ... of biosimilarity of its proposed biosimilar, Epoetin Hospira, ... conditionally approved name of RETACRIT™, compared to the ... data were presented at the National Kidney Foundation ...
(Date:3/27/2015)... Concord Medical Services Holdings Limited ("Concord ... a leading specialty hospital management solution provider and ... diagnostic imaging centers in China ... agreement under which Concord Medical Services (International) Pte ... agreed to acquire the Fortis Surgical Hospital from ...
(Date:3/26/2015)... -- "Whether it,s our family, our friends, all of ... a single sentence, Dr. Anthony Coyle , senior ... Centers for Therapeutic Innovation (CTI), sums up what ... biopharmaceutical companies. CTI,s unique model allows ... and the National Institutes of Health (NIH) to bridge ...
Breaking Medicine Technology:Hospira Clinical Data Shows Proposed Biosimilar, Epoetin Hospira, Demonstrates Pharmacokinetic And Pharmacodynamic Equivalence Compared To Amgen's Epogen 2Hospira Clinical Data Shows Proposed Biosimilar, Epoetin Hospira, Demonstrates Pharmacokinetic And Pharmacodynamic Equivalence Compared To Amgen's Epogen 3Concord Medical Announces Acquisition of Fortis Surgical Hospital in Singapore 2Concord Medical Announces Acquisition of Fortis Surgical Hospital in Singapore 3Collaboration for Cures: Teaming Up to Advance Science and Save Lives 2
Cached News: