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Hans Selye defined stress as “the nonspecific (that is, common) result of any demand upon the body, be the effect mental or somatic.” [5] This includes the medical definition of stress as a physical demand and the colloquial definition of stress as a psychological demand. A stressor is inherently neutral meaning that the same stressor can ...
Physiological stress represents a wide range of physical responses that occur as a direct effect of a stressor causing an upset in the homeostasis of the body. Upon immediate disruption of either psychological or physical equilibrium the body responds by stimulating the nervous , endocrine , and immune systems .
However, the problem arises when there is a persistent threat. First-time exposure to a stressor will trigger an acute stress response in the body; however, repeated and continuous exposure causes the stressor to become chronic. [4] McEwen and Stellar (1993) argued there is a "hidden cost of chronic stress to the body over long time periods". [8]
Rather than causing us to store anger in our back, or fear in our stomach, stress triggers a dynamic whole-body response—and it happens not just when people repress their emotions, but even if ...
The lower the stress levels are in the body, the less likely the allostatic load model will have a significant effect on the brain and health. Although, an increase in stress levels results in an increase in stress on the brain and the health of individuals, making it more likely for the body to have significant effects on homeostasis and cause ...
Stress hormones can also induce a state of chronic inflammation, [8] which can damage the body's tissues and organs and increase the risk of chronic diseases, such as arthritis, diabetes, and cardiovascular disease. These effects can make the body more vulnerable to chronic infections, such as bacterial infections and autoimmune diseases, which ...
The free-radical theory states that compounds inactivating ROS would lead to a reduction of oxidative stress and thereby produce an increase in lifespan, although this theory holds only in basic research. [17] However, in over 19 clinical trials, "nutritional and genetic interventions to boost antioxidants have generally failed to increase life ...
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