stress response


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Related to stress response: stress response syndrome

stress response

Flight-or-fight response, see there.

stress response

The predictable physiological response that occurs in humans as a result of injury, surgery, shock, ischemia, or sepsis. Synonym: physiological stress response

This response is hormonally mediated and is divided into three distinct phases:

Ebb phase (lag phase): For 12 to 36 hr after the precipitating event, the body attempts to conserve its resources. Vital signs (heart, respiration, temperature) are less than normal. Flow phase (hypermetabolic phase): This stage peaks in 3 to 4 days and lasts 9 to 14 days, depending on the extent of the injury or infection and the person's physical and nutritional status. Carbohydrate, protein, and fat are mobilized from tissue stores and catabolized to meet the energy needs of an increased metabolic rate (hypermetabolism). Serum levels of glucose and electrolytes such as potassium can increase dramatically. If this stage is not controlled by removal of the cause or activator, multiple system organ failure or death can result. Anabolic phase (recovery): The anabolic, or healing, phase occurs as the catabolism declines and electrolyte balances are restored. Aggressive nutritional support is often necessary to promote a positive nitrogen balance.

See also: response

stress response,

n physiologic response to stress; comprises three phases. The fight-or-flight response is the first phase, in which the sympathetic nervous system is activated, increasing heart rate, respiration, and blood pressure. In the second phase the organism adapts to the source of stress. The third and final phase is exhaustion. Also called
general adaptation syndrome.
References in periodicals archive ?
An acute stress response occurs where there is a sudden perceived threat (eg being startled by a loud noise) or when a sudden physiological demand is placed on the body, such as exercising or an acute injury.
When this part of the stress response kicks in, it can give you extraordinary physical abilities.
The primary mechanisms of the stress response system include the sympathetic-adrenal-medullary (SAM) axis, the limbic system, and the hypothalamic-pituitary-adrenal (HPA) axis.
The physiological stress response is common to all vertebrates and can be initiated by many types of environmental changes.
However, acute and chronic stress are often superimposed during the life span, and the consequences of this overlap can include a modulation of the hypothalamic-pituitary-adrenal axis by chronic stress that can interfere with the acute stress response (BARCELLOS et al.
Glucocorticoid stress responses can be initiated by physiological perturbations (representing reflexive responses) or by brain processes linking environmental cues with probable negative outcomes.
But in another study Kahl et al have demonstrated that tracheal intubation-associated reduction of cardiovascular and endocrine stress response was more pronounced by using ILMA than that by using direct laryngoscopy10.
Perception of stress elicits adrenal release of adrenaline, noradrenaline, and cortisol, which feed back negatively to the pituitary and hypothalamus, reducing and normalizing the stress response mediated by the hypothalamic corticotrophin releasing hormone (CHR) and pituitary adrenocorticotropic hormone.
On the other hand, decreasing the stress response in tumor cells by preconditioning them with various agents is often explored in experimental models with the aim of developing the method to increase the susceptibility of tumor cells to treatment.
However, given that stress response circuitry involves a "perfect storm" of brain regions with some of the most striking sex differences, which both develop and function differently in men and women, and which regulate mood and cardiac function, Dr.
Our hypothesis is that secure attachment could reduce the risk for childhood obesity by preventing frequent or exaggerated stress responses from disrupting the normal functioning and development of the systems that affect energy balance and body weight Children's stress responses and emotion regulation are formed in early childhood in the context of parent-child interactions, and one indicator that the child has developed healthy emotion regulation and stress response is secure attachment.
In a study among rats, they found that when food was not present, a stress response occurred that temporarily causes a functional rewiring in the brain that may impair the ability to regulate food intake.