Understanding and Managing the Stress Response
Imagine for a moment that you are living in the Stone Age, some 10,000 years ago. Your day largely consists of gathering food for you and your family to eat. Life is stressful, but you have no complaints. Your priorities are clear, you know how to survive, and you take pride in your ability to handle whatever comes your way.
The Stress Response
Now imagine that it is dusk and you and some companions are returning from a long, exhausting day of hunting. You suddenly encounter a small pack of startled wolves, obviously threatened by your presence. A violent confrontation is imminent. As if turned on by an unseen switch, you instinctively set in motion a torrent of physiologic, emotional, and behavioral reactions designed to maximize your chances of survival. This is called the stress response.
To survive in the face of this stressor, you will need to see clearly (even at dusk), think coherently, move rapidly, and cooperate with your allies. This requires a sharp increase in blood flow and oxygen supply to your brain, special senses, and skeletal muscles. Your heart rate increases, your blood pressure rises, your breathing quickens, your airways widen.
Blood is diverted away from nonessential organs such as your skin, which becomes cool and clammy. Your pupils dilate and, in case you're injured in an ensuing battle, your immune system is suppressed to dampen the painful consequences of inflammation. Two stress hormones, produced in large part by the adrenal glands, primarily orchestrate these physiologic changes: epinephrine (or adrenaline) and cortisol.
You and your companions know exactly what to do. You coordinate your positions, raise your weapons, and prepare for a fight. Fortunately, the wolves retreat. As the danger subsides, so does the stress response, which is highly adaptable to a rapidly changing environment. As quickly as it turns on, it turns off once the threat has passed. You proceed home, a little shaken, but otherwise feeling fine as your epinephrine and cortisol levels return to normal.
Stone-agers in the 21st Century
Now imagine it is present day. Your day largely consists of making money so you and your family have food to eat. It is dusk and you're getting ready to return home from a long, exhausting day at work. On your way out, your hostile boss inappropriately accuses you of a mistake you did not commit, and insists that you immediately correct the problem. While not imminently life-threatening, this blow to your integrity is enough to ignite a typical stress response, the physiology of which has not changed since the Stone Age. Supervisors, deadlines, responsibilities, and social injustices have replaced wild animals as stressors in your environment.
So, what do you do?
Argue with your boss or quit your job to escape his threatening behavior? On the contrary. Feeling trapped by societies expectations, you respond, through clenched teeth, "I'm sorry. I'll take care of it." While your Stone Age counterpart was free to fight or flee, you are forced to endure the standoff. Yours is a stress response with no place to go. And, unlike the retreating wolves, you are faced with similar stressors all day, everyday.
Stress and Health
A maladaptive stress response—one that essentially never shuts off—is potentially harmful in two ways:
- Continuous or repeated surges of excess stress hormone are detrimental to the cardiovascular and immune systems, potentially increasing your risk of ]]>coronary heart disease]]> , ]]>stroke]]> , ]]>cancer]]> , recurrent infection, and other chronic diseases.
- As an outlet to the persistent stress, you are more likely to turn to destructive behaviors such as ]]>tobacco abuse]]> , ]]>excessive alcohol consumption]]> , and dietary overindulgence.
Ironically, the same stress response that could have saved your life in the Stone Age can kill you today.
So, how do you avoid the damaging effects of prolonged stress? There are two basic approaches: eliminate the stressors or minimize the stress response. Avoiding stress all together seems to be the most obvious and promising strategy. However, this is not a realistic option. Life has been stressful since the Stone Age, and there's only so much you can do to avoid it.
Ways to Adapt to Stress
Rather than trying to hide from the inevitable, it makes more sense to moderate the harmful effects of the stress response. There are three basic ways to accomplish this:
Use the Stress Response
Don't take it lying down! While your stress hormones are up, channel them into productive activities. Exercise is an ideal outlet for excess epinephrine and cortisol. Not only does regular exercise clearly benefit the cardiovascular and immune systems, it also offsets the destructive emotions often associated with the stress response, like ]]>anxiety]]> and ]]>depression]]> .
Alleviate the Stress Response
Originally, scientists assumed the stress response was involuntary—entirely out of willful control. Recently, however, researchers have discovered our ability to consciously lower our heart rate and ]]>blood pressure]]> , raise our skin temperature, and decrease our muscle tone through meditation and other forms of mind-body interventions. Interestingly, they have also found that stress hormone levels drop during these activities. Yoga and tai chi, which combine meditation with exercise, may be particularly effective at mitigating the stress response.
Avoid the Stress Response
By reinterpreting the impact of a stressor, it may be possible to avoid or severely restrict a maladaptive stress response. While the stress in your life is very real and unavoidable, you may have an exaggerated conception of its magnitude and meaning. Although it is entirely appropriate to have a major stress response when confronting a pack of wolves, a boss's misinterpretation of facts need not necessarily produce a prolonged surge of stress hormones.
A process called cognitive-behavior therapy can train you to think and act in ways that result in more realistic and healthy responses to stress. A cognitive-behavioral therapist will help you accept the fact that life is stressful. You will see that health will come not from avoiding life's inevitable stressors, but by finding the resilience to adapt to its challenges.
American Psychological Association
Mental Health America
Canadian Psychiatric Association
Canadian Psychological Association
Last reviewed January 2008 by ]]>Ryan Estévez, MD, PhD, MPH]]>
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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