Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Caffeine-herbal ephedra combination alters cardiovascular response prior, during and after exercise

10.04.2003


New study results demonstrate why caffeine and ephedra may provide a "final boost"



After Baltimore Orioles pitcher Steve Bechler died during spring training earlier this year, the spotlight again turned on the dietary supplement ephedra. The Chinese herb, used for asthma in the 1960s, is attractive to athletes, because it provides and energy "boost" during games, and offers pound-dropping qualities (an attraction for Bechler, who was ten pounds overweight).

Ephedra has been linked to almost 100 deaths, among them high school and college athletes who have collapsed during games or practice. The supplement is banned from the National Football League (NFL), National College Athletic Association (NCAA) and the Olympics, but not from major league baseball. Even before this high profile death, ephedra was viewed with caution. For example, even thought the supplement makes up less than one percent of herbal supplement sales, the Food and Drug Administration (FDA) believes ephedra causes 64 percent of all reported side effects from herbs.


Controversy and Confusion

The controversial herb could be found in the energy supplement, now discontinued, called "Yellow Jackets." These "energy boosters" contained 520 mg of Ephedra Extract (supplying 25mg ephedrine alkaloids), Kola Nut Extract (supplying 200mg caffeine alkaloids), White Willow Bark, and Chromium Picolinate. The University of Memphis labeled such combinations "deadly." However, the International Journal of Obesity stated in its May 2002 issue that "The combination of ephedra and caffeine is safe and effective for weight loss."

A New Study

Against this backdrop, a team of researchers set out to examine how ephedra and coffee could impact on health. The authors of the study "Caffeine-herbal Ephedra Combination Alters the Cardiovascular Response Prior to, During, and Following Exercise," are Tasha P. Ballard and Matthew D. Vukovich, both from the South Dakota Health Promotion and Research Program, South Dakota State University, Brookings, SD. They will present their findings at the upcoming meeting, Experimental Biology 2003, being co-sponsored by the American Physiological Society (APS). More than 7500 scientists and researchers are expected to attend the meeting, being held April 11-15, 2003, at the San Diego Convention Center, San Diego, CA.

Methodology

Caffeine-naïve subjects (five men and five women) were studied at rest, during exercise, and recovery after the ingestion of either a placebo or 150mg caffeine/20mg ephedra. Key physiological measurements (blood pressure, VO2, hypersensitive response) were made prior to, and 30 and 60 minutes following after the administration of supplements.

Results

Hypersensitive response was higher at 60 minutes rest in caffeine/ephedra subjects and remained higher at 30 and 60 minutes of exercise. Additionally, those taking the supplements registered higher systolic blood pressure during rest. Mean arterial pressure also measured higher in the caffeine/ephedra group.

Conclusions

Those ingesting caffeine and ephedra prior to exercise will alter the cardiovascular system by increasing hypersensitive response prior, during, and after exercise, and systolic blood pressure before exercise. The higher rate pressure indicates greater demands on the heart when individuals consume caffeine and ephedra.

The American Physiological Society (APS) is one of the world’s most prestigious organizations for physiological scientists. These researchers specialize in understanding the processes and functions underlying human health and disease. Founded in 1887 the Bethesda, MD-based Society has more than 10,000 members and publishes 3,800 articles in its 14 peer-reviewed journals each year.


Contact: Donna Krupa@ 703.527.7357 (vm)
Or 703.967.2751 (cell) or djkrupa1@aol.com
Through April 10th, 2003

Donna J. Krupa | EurekAlert!
Further information:
http://www.faseb.org/aps/

More articles from Health and Medicine:

nachricht World first: Massive thrombosis removed during early pregnancy
20.07.2017 | Universitätsspital Bern

nachricht Therapy of preterm birth in sight?
19.07.2017 | Universitätsspital Bern

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

Im Focus: On the way to a biological alternative

A bacterial enzyme enables reactions that open up alternatives to key industrial chemical processes

The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....

Im Focus: The 1 trillion tonne iceberg

Larsen C Ice Shelf rift finally breaks through

A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...

Im Focus: Laser-cooled ions contribute to better understanding of friction

Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision

Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

The technology with a feel for feelings

12.07.2017 | Event News

 
Latest News

NASA looks to solar eclipse to help understand Earth's energy system

21.07.2017 | Earth Sciences

Stanford researchers develop a new type of soft, growing robot

21.07.2017 | Power and Electrical Engineering

Vortex photons from electrons in circular motion

21.07.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>