Stress-the way a person responds to change and difficult situation-is a common experience that people all over the world share (blonna, 2005). In fact, most people have stressful experiences every day. However, research shows that people experience more stress today than they did in the past. Forty-eight percent of people in the United states report that they feel more stressed today than they did five years ago. In addition, most doctor visits in the world (three out of five) happen because of problems related to stress. Scientists and health workers are interested in this subject because consequences that can affect people health and daily lives.
Researchers at Rutgers university suggest that recent change in people lifestyle have caused more stress. Stress cause the body to experience physical changes such as a faster heartbeat and breathing rate. The right level of stress can make a person feel stronger and more energetic. Researchers believes that in the past this energy helped people to hunt for animals and to protect themselves from danger (cannon,1932) they released stress with physical activity invoed in hunting,and then their bodies could relax again. Although, people today still experience an increase in energy in response to stress, they do not use energy like the hunter-gatherers did. As a result, it is more difficult for their bodies to let go of stress.