Stress Flashcards
GAS
General adaptive syndrome
Selye
adapting to a stressor
GAS
alarm reaction- when the stressor is perceived the psychological response is activated for fight or flight
resistance- body trys to adapt by resisting the stressor the parasympathetic nervous system is activated to conserve energy as stress is becoming chronic
exhaustion- body fails to adapt to chronic stressor, resources become drained and symptoms of sympathetic arousal appear again, stress related illnesses now likely-alopecia
research into GAS
selye
exposed rats to various stressors, regardless of stressor the same response occurred 6-48 hours after stressor was presented.
research into GAS
Mason
replicated selye procsudure using monkeys. exposed them to 7 stressors, different stressors have different effects on urinary cortisol levels
Weaknesses to GAS
unethical
extrapolation issues
Mason- individual/gender differences in cortisol/adrenaline levels
strengths of GAS
Selye- observed human patients and found they shared common symptoms eg aches and pains no matter the injury. same result with rats. physiological reaction same
practical application to reduce symptoms.
SMP
Sympathomedullary pathway
sympathomedullary pathway
SMP
hypothalamus triggers activity in the sympathetic nervous system, ACTH is released.
adrenaline and noradrenaline are released into the blood stream
adrenaline and noradrenaline effect the body in different ways eg. heart rate
research in SMP
Taylor et al
found acute stressors produce fight or flight response in men however women produce tend and befriend due to women producing more oxytocin which promotes relaxation and nursing
research into SMP
mccarly
blood plasma levels of adrenaline and noradrenaline were equal in rats of varying ages before subjecting them to an electric shock for one minute. older rats has lower levels after the shock shows older rats hormones decrease so struggle to adapt.
research into SMP
horwatt
animals exposed to same stressor everyday for several weeks. SMP started to adapt as catecholamines changed production.
strengths of SMP
objective-reliable
fight/flight seen in all mammals- reductionist, generalisable
people without hormones supplements need adrenal glands- practical application
weaknesses of SMP
variations of level and type of hormones released-Taylor et al- validity
ignores psychological factors- Lazarus- add conscious thought, not valid
gender differences-Taylor
extrapolation
HPA
hypothalamic pituitary-adrenal system
Hypothalamic pituitary-adrenal system
HPA
hypothalamus triggers the release of CRH, this then stimulates the interior pituitary gland and releases ACTH.
ACTH then travels through the body and stimulates the adrenal cortex, the adrenal cortex then releases cortisol that converts protein to glucose giving the blood energy this is needed to replace what was used up by the bodys first reaction to stress
long term effect of high cortisol levels can damage the immune system and negatively impact memory.
Weaknesses of HPA
Mason- different individuals produce different levels of stress hormones when exposed same stressor-individual difference
people are more active to cognitive or emotional stressors- Symington et al- conscious terminal cancer patients experienced more stress then those in a coma
strengths of HPA
prolonged activation of HPA can lead to crushing’s syndrome-practical application to develop treatment
objective- reliable
Direct effect of stress
stress response-glucose in blood-furring of the arteries-heart attach
indirect effect of stress
stress-body can’t cope-illness
changes due to stress
increased heart rate increased blood pressure short of breath increased sweating slows immune system slows digestion blood clots increased stress hormones increased stomach acid hormones eg ageing/sex decrease increase blood sugar blood flows to muscles
immunosuppression
chronic stress
stress response-activates HPA- produces cortisol- inhibits production of lymphocytes(white blood cells)- invading viruses make us ill as bacteria isn’t attacked
Research into immune suppression
Kiecolt-Glaser at al
blood samples from medical students. (49 males/26 females volunteers) samples taken a month before and during exams. immune functioning assessed by T cell activity. blood sample from month before contained more t-cells then during exams
research into immune suppression
Evans et al
students giving mildly stressful presentation had increased sigA(anti-body) suggesting short term stress can beneficial to the functioning to immune system
Cardiovascular disorder
sympathetic nervous system constricts blood vessels increasing blood pressure and heart rate- increased heart rate wears away the lining of the blood vessels- increased glucose levels leads to clumps blocking the vessels