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In Medical terms, stress is the disruption of Homeostasis through Physical or Psychological Stimuli . Stressful stimuli can be Mental , Physiological , Anatomical or Physical Rippetoe-Kilgore, Mark and Lon. 2006 . ''Practical Programming for Strength Training''. ISBN 0-9768-0540-5 reactions. The term 'stress' in this context was coined by Austro- Canadian Endocrinologist Hans Selye , who defined the General Adaptation Syndrome or '''GAS''' paradigm in 1936. TYPES OF STRESS Richard Lazarus published in 1974 a model dividing stress into Eustress and Distress . Where stress enhances function (physical or mental, such as through Strength Training or challenging work) it may be considered Eustress . Persistent stress that is not resolved through coping or adaptation ( Distress ) may lead to escape (anxiety) or withdrawal (depression) behavior. The difference between experiences which result in eustress or distress is determined by the disparity between an experience (real or imagined), personal expectations and resources to cope with the stress. A person living in a fashion consistent with personally-accepted expectations may have no stress even if the conditions might be interpreted as adverse from some outside perspective — Rural people may live in comparative Poverty , and yet be unstressed if their resources are sufficient to meet their needs and expectations. If there is chronic disparity between experience and expectations, stress may be relieved by adjustment of expectations to meet the ongoing experiences or conditions. Alarming experiences, either real or imagined, can trigger a stress response.1 ADAPTATION TO STRESS See Also: Stress management Responses to stress include adaptation, Psychological Coping such as Stress Management , Anxiety , and Depression . Over the long term, distress can lead to diminished health or illness; to avoid this, stress must be Managed . GENERAL ADAPTATION SYNDROME This is a model on stress, researched mainly by Hans Selye 23 on rats and other animals. His research involved exposing animals to unpleasant or harmful stimuli such as injections, extreme cold and even Vivisection . He found that all animals showed a very similar series of reactions, broken into three stages. He describes this universal response to the stressors as the General Adaption Syndrome or '''GAS''' in 1936. Stage one: alarm When the threat or stressor is identified or realised, the body's stress response is a state of alarm. During this stage adrenaline will be produced in order to bring about the Fight Or Flight Response . There is also some activation of the HPA Axis , producing Cortisol . Stage two: resistance If the stressor persists, it becomes necessary to attempt some means of coping with the stress. Although the body begins to try to adapt to the strains or demands of the environment, the body cannot keep this up indefinitely, so its resources are gradually depleted. Stage three: exhaustion In the final stage in the GAS model, all the body's resources are eventually depleted and the body is unable to maintain normal function. At this point the initial Autonomic Nervous System symptoms may reappear (sweating, raised heart rate etc.). If stage three is extended, long term damage may result as the capacity of glands, especially the adrenal gland, and the immune system is exhausted and function is impaired resulting in decompensation. The result can manifest itself in obvious illnesses such as ulcers, depression or even cardiovascular problems, along with other mental issues. NEURO-CHEMISTRY AND PHYSIOLOGY The neurochemistry of the general adaptation syndrome is now believed to be well understood, although much remains to be discovered about how this system interacts with others in the brain and elsewhere in the body. The body reacts to stress first by releasing the Catecholamine Hormones , Epinephrine and Norepinephrine , and the Glucocorticoid hormones, Cortisol and Cortisone . The Hypothalamic-pituitary-adrenal Axis (HPA) is a major part of the Neuroendocrine System , involving the interactions of the Hypothalamus , the Pituitary Gland , and the Adrenal Gland s. The HPA axis is believed to play a primary role in the body's reactions to stress by balancing hormone releases from the adrenaline-producing Adrenal Medulla , and from the Corticosteroid -producing Adrenal Cortex . Stress can significantly affect many of the body's immune systems, as can an individual's perceptions of, and reactions to, stress. The term Psychoneuroimmunology is used to describe the interactions between the mental state, nervous and immune systems, as well as research on the interconnections of these systems. HISTORY OF STRESS It was gradually realized that such concepts as Anxiety , Antagonism , Exhaustion , Frustration , Distress , Despair , overwork, Pre-menstrual Tension , over-focusing, confusion, mourning, and Fear could all come together in a general broad term, ''stress.'' The popular use of the term in modern folklore expanded rapidly and created an industry of Popular Psychology , Self-help , Psychotherapy , and sometimes Quackery . There were a series of films in the 30s, 40s, & 50s that dealt with mad scientists playing with hormones that seem related to this folklore. The use of the term ''stress'' in serious and recognized cases, such as those of Post-traumatic Stress Disorder and Psychosomatic Illness , has scarcely helped clear analysis of the generalized "stress" phenomenon. Nonetheless, some varieties of stress from negative life events ''( Distress )'' and from positive life events ('' Eustress '') can clearly have a serious physical impact distinct from the troubles of what psychotherapists call the "worried well." Stress activates the sympathetic branch of the autonomous nervous system and the release of stress hormones including Epinephrine , and Cortisol . Sympathetic nervous output produces the Fight-or-flight Response , causing the body to divert bloodflow to large muscles as the body prepares to run away from or fight something. Less blood flows to the Digestive System and other organs that do not assist in fleeing or fighting, producing dry mouth, motor agitation, sweating, Pallor , enlarged Pupil s and over the long term, Insomnia . Modern stressors can cause continual Sympathetic Nervous System activation with very little opportunity for the Parasympathetic Nervous System to activate. When the parasympathetic system is active, the bowel and other non-muscle organs receive good blood-flow, the pupils constrict, and the Gland s all function well and secrete their various compounds. Absence of the autonomic parasympathetic activation leads to poor digestion and may lead to poor healing and organ function. STRESS AND BURNOUT See Also: Stress management While Burnout Cordes, C. and Dougherty, T. (1993). A review and integration of research on job burnout. Academy of Management Review, 18, 621-656., a psychological term, usually associated with Emotional Exhaustion in the work arena, that depicts chronic depletion of resources, is provoked by lasting or repeated exposure to Stress ( Stressor ), that may result in mental (emotional) and physical fatigue - a lot of Stress does not necessarily cause Burnout . It is important to differentiate between stress and Burnout (or Emotional Exhaustion ). Although Rosch, PJ. Reminiscences of Hans Selye and the birth of "Stress". Stress Medicine, 1998; 14: 1-6 (Editorial) 1998.Rosch, PJ. Hans Selye. International Journal of Emergency Mental Health, 1999; 1:59-66. Burnout can be the result of exposure to (subjective) stressful events – it doest NOT, by any mean, implies that been (feeling) "Over Stressed" is like (let alone - as is) been (feeling) " Burnout " (or Emotional Exhausted for that matter); While Stress can be seen as the product of "crossing the threshold" of Excessive Stimuli or of too many or high demands (whether behavioral demands or psychological ones) then one can endure, people "under stress" and even those "Over Stressed" still believe that given enough resources they will regain control - that is - their current negative state is temporary and when it will come to pass, their "well-being" shall return as well. Burnout is associated with feelings of emptiness and total lack of energy and motivation typically with Negative Affect and Depression , resulting from loosing the believe in one self and the drainage of resources to the point of Depletion. Thus, it is crucial to identify and better understand the contributing and preventing factors that effect this process in which stress transforms into Burnout and to Manage it. COMMON FACTORS OF STRESS Both negative and positive stressors can lead to stress. Some common categories and examples of stressors include:
One evaluation of the different stresses in people's lives is the Holmes And Rahe Stress Scale . SEE ALSO REFERENCES
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