The technique is so powerful that physician James Gordon，director of the Centre for Mind－Body Medicine in Washington，teaches it to nearly every patient he sees.

　　“Slow，deep breathing is probably the only best antistress medicine we have，” says Gordon，“When you bring air down into the lower part of the lungs，where oxygen exchange is most efficient，everything changes.Heart rate slows，blood pressure decrease，muscles relax，anxiety ceases and the mind calms.”

　　Obviously，everyone alive knows how to breathe.But Gordon and other experts in the field of mind-body medicine say that few people in industrialized societies know how to breathe correctly.They are taught to suck in their guts(内脏) and puff out(鼓起) their chests.At the same time，they are attacked with constant stress，which causes heart rate to increase.As a result，they become shallow “chest breathers”，using primarily the middle and upper parts of the lungs.Few people—other than musicians，singers and some athletes are even aware that the abdomen should expand when they breathe in.

　　“Watch a baby breathe，” says Gordon，“and you'll see the abdomen go up and down，deep and slow.” With age，most people change from this healthy abdominal breathing into shallow chest breathing.

　　At Duke University Medical Centre，Dr.Jon Seskevich has taught abdominal breathing to most of the 18，000 patients he's worked with since 1990.

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