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:5/27/2015)... The Society for Women's Health Research ... in research on sex differences in health and disease, ... survivors, advocates, organizations, and celebrities in bringing awareness to ... The campaign features a short film that shares the ... disease as a result of their abuse, as well ...
(Date:5/27/2015)... May 27, 2015 Join us for the ... family-friendly event seeks to spread awareness of brain aneurysms and ... overall appreciation for life. , The 3rd Annual Appreciation ... the Braham Area Community Center located at 655 8th Street, ... at 8:00am, while the 5K Walk/Run kicks off promptly at ...
(Date:5/27/2015)... 27, 2015 Get Tested Coachella ... ending the spread of HIV, will recognize its most ... Annual YesGTCV Social Ambassador Awards, to be held on ... PST. , A first for public health campaigns, the ... most active online influencers for breaking down stigma, spreading ...
(Date:5/27/2015)... York (PRWEB) May 27, 2015 ... will now be offering Eco-fin Hand Treatments to ... treatment is a paraffin wax alternative. It is a ... 100% natural plant-based emollients and pure essential oils. No ... "We have used Eco-fin treatments for our mobile ...
(Date:5/26/2015)... 2015 In celebration of Parker and Sons ... a discount on HVAC systems with a high Season Energy ... HVAC systems with a SEER rating around 15-16 can be ... For those unfamiliar with a SEER rating, it is essentially ... it measures the amount of energy expended by the actual ...
Breaking Medicine News(10 mins):Health News:The Society for Women’s Health Research Announces “Beyond the Bruises” Campaign Highlighting the Effects of Domestic Violence on Chronic Disease 2Health News:The Society for Women’s Health Research Announces “Beyond the Bruises” Campaign Highlighting the Effects of Domestic Violence on Chronic Disease 3Health News:Renowned Brain Aneurysm Foundation to Benefit from 3rd Annual Appreciation for Life 5K Walk/Run in Braham, MN Being Held on June 6th 2Health News:Regional Public Health Campaign to Host 1st Annual YesGTCV Social Ambassador Awards 2Health News:Regional Public Health Campaign to Host 1st Annual YesGTCV Social Ambassador Awards 3Health News:Long Island's Massage and Spa Of Commack Announces A Change To Their Spa Party Menu Of Services 2Health News:Long Island's Massage and Spa Of Commack Announces A Change To Their Spa Party Menu Of Services 3Health News:Parker and Sons Recounts its Path to Success 2
(Date:5/27/2015)... and Markets( http://www.researchandmarkets.com/research/c8jldk/global_healthcare ) has announced the addition of ... to their offering. The Global Healthcare BPO ... BPO to grow at a CAGR of 5.32% over ... of outsourcing, which consists of subcontracting the business processes ... the expertise in the required domains. It helps clients ...
(Date:5/27/2015)... Every global traveler knows how jet ... meeting when it,s difficult to keep focused, and it,s waking up ... re-charge. Jet lag is getting back home a week later, not ... family, or to perform at work.   HumanCharger ... for jet lag by helping travelers make softer landings to new ...
(Date:5/26/2015)... , May 26, 2015  Haemonetics Corporation (NYSE: ... , Vice President, Investor Relations, will present at The ... on June 4 th , 2015 at ... access Mr. Gould,s presentation live via webcast at: ... (NYSE: HAE ) is a global healthcare company ...
Breaking Medicine Technology:Global Healthcare BPO Market 2015-2019 - Emergence of Cloud-based BPO in Healthcare with Accenture, Cognizant, Genpact, IBM, TCS, Wipro & Xerox Dominating 2Beat Jet Lag the Way Elite Athletes Do. Twice as Fast With HumanCharger 2Beat Jet Lag the Way Elite Athletes Do. Twice as Fast With HumanCharger 3
Cached News: