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:7/29/2015)... ... 29, 2015 , ... A June 10, 2015 article from the News-Press, entitled ... importance of having regular skin cancer screenings from an early age. Skin cancer can ... When caught early, skin cancer is rarely fatal; however, if left alone for too ...
(Date:7/29/2015)... (PRWEB) , ... July 29, 2015 , ... Employee Fiduciary, ... will include the general contact information, website, types of plans administered, years in business, ... business listing and have at least one plan with Employee Fiduciary. A search can ...
(Date:7/29/2015)... ... ... Several years ago, in order to be in the strongest position possible ... stance and began planning the Children’s Village consisting of six homes. , Two are ... third home. , “We are very pleased to have received the $500,000 grant from ...
(Date:7/29/2015)... St. Louis, MO (PRWEB) , ... July 29, 2015 , ... ... the website, the Talcum Powder Cancer Lawsuit Center. The website now features a page ... warnings, and news pieces from other sources. The Talcum Powder Lawsuit News ...
(Date:7/29/2015)... Canada (PRWEB) , ... July 29, 2015 , ... ... as a “forward thinker.” Since the late 1970s, Dr. Cottrell has been making ... new book, The New Earth, documents many of these prognostications. He warns that ...
Breaking Medicine News(10 mins):Health News:Get Checked for Skin Cancer Early and Often 2Health News:Get Checked for Skin Cancer Early and Often 3Health News:Employee Fiduciary Launches Financial Advisor Directory 2Health News:Little City Receives $500,000 Matching Grant from The Coleman Foundation 2Health News:Little City Receives $500,000 Matching Grant from The Coleman Foundation 3Health News:National Attorneys Provide Regular Talcum Powder Lawsuit News Updates 2Health News:National Attorneys Provide Regular Talcum Powder Lawsuit News Updates 3Health News:Author Warns Public to Prepare for Imminent Environmental Disaster 2
(Date:7/29/2015)... 29, 2015  Efforts to improve working capital efficiency ... firms in North America and ... an effective working capital management will ease the difficulties ... Big pharma companies expect to invest in optimizing working ... http://photos.prnewswire.com/prnh/20150724/241957LOGO Analysis from Frost ...
(Date:7/28/2015)... FRANCISCO , July 28, 2015 Codman ... Johnson, has introduced a new platform of embolic coils ... enhanced detachment system designed to improve microcatheter stability and ... The announcement was made here at the Society of ... The family of framing, filling and finishing coils ...
(Date:7/28/2015)... , July 28, 2015   Regulus Therapeutics Inc ... the discovery and development of innovative medicines targeting microRNAs, ... highlights for the quarter ended June 30, 2015 on ... close. Regulus will host a conference ... 5:00 pm Eastern Daylight Time to discuss its second ...
Breaking Medicine Technology:Working Capital Management Seizes Priority in North American and European Pharma Industry 2Working Capital Management Seizes Priority in North American and European Pharma Industry 3Working Capital Management Seizes Priority in North American and European Pharma Industry 4Codman Neuro Launches Family Of Coils For Treatment Of Brain Aneurysms 2Codman Neuro Launches Family Of Coils For Treatment Of Brain Aneurysms 3Codman Neuro Launches Family Of Coils For Treatment Of Brain Aneurysms 4Regulus Announces Timing for Second Quarter 2015 Financial Results Webcast and Conference Call 2Regulus Announces Timing for Second Quarter 2015 Financial Results Webcast and Conference Call 3
Cached News: