Having a coffee fix just before a workout may not be the best idea, a new study suggests.

Researchers in Switzerland found that the amount of caffeine in just two cups of coffee limits the body's ability to increase blood flow to the heart during exercise.

"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," Dr. Philipp A. Kaufmann, of the University Hospital Zurich and Center for Integrative Human Physiology, said in a prepared statement.

The study appeared in the Jan. 17 issue of American College of Cardiology.

Source: HealthCentral.com