Stress Flashcards
Complete
What is the definition of stress?
A mismatch between the perceived demands of the environment and the body’s ability to cope with this demand
What are the two physiological responses to stress?
The sympathomedullary pathway (SAM)
The hypothalamic pituitary-adrenal system (HPA) - also referred to as the pituitary-adrenal system
What is the short-term response to stress called?
The sympathomedullary pathway (SAM)
What is the long-term response to stress called?
The hypothalamic pituitary-adrenal system (HPA)
What happens in the SAM pathway?
Hypothalamus activates sympathetic branch of the autonomic nervous system.
Adrenaline and noradrenaline are released by the adrenal medulla (part of the adrenal gland).
Immediate fight or flight response - increased heart rate, breathing rate, digestion slowed, pupils dilated
What happens to the SAM pathway after the stressor disappears?
Parasympathetic branch of the autonomic nervous system activated, fight or flight response reduced, body returns to resting state
What happens in the HPA pathway?
Hypothalamus secretes CRF (a releasing hormone).
CRF causes the pituitary gland to release ACTH (a stimulating hormone).
ACTH stimulates the adrenal cortex (part of the adrenal gland) to release stress-related hormones e.g. cortisol
When is the HPA pathway triggered in relation to the SAM pathway?
At the same time - it just lasts longer (if the stressor persists)
What are the 3 main functions of cortisol?
Reduces immune system functioning (immunosuppression)
Maintains steady supply of glucose in the bloodstream
Reduces sensitivity to pain
Why does cortisol reduce immune system functioning (immunosuppression)?
Everything is geared to dealing with the stressor/threat, protecting against infection and tissue repair are second priority in comparison to the emergency
Why does cortisol maintain a steady supply of glucose in the bloodstream?
Ensures sufficient energy for the body to cope with the stressor
Why does cortisol reduce sensitivity to pain?
Not distracted/in pain whilst they deal with the stressor (particularly beneficial when fighting/fleeing a predator)
How are the short-term and long-term responses to stress reductionist?
Lazarus claimed the response is influenced by an individual’s perception of the stressor
2 groups of participants, 1 told gruesome initiation rites were exciting, other group told they were painful, second group showed more arousal of the ANS
Purely physiological accounts are not sufficient
How are the short-term and long-term responses to stress gender biased/androcentric?
Fails to consider gender differences
Taylor et al suggested tend and befriend response in females due to more oxytocin
Inappropriate to propose males and females respond in the same way
(extra: this led to more research into female response)
Who identified the general adaption syndrome (GAS)?
Selye (used rats)
Why is the ‘G’ in GAS ‘general’?
It is the same response to all stressors
Why is the ‘A’ in GAS ‘adaption’?
It is adaptive behaviour (best way to cope/survive)
Why is the ‘S’ in GAS ‘syndrome’?
There are several symptoms
What are the 3 stages of the general adaption syndrome?
Alarm -> Resistance -> Exhaustion
What happens in the alarm stage of GAS?
The threat/stressor is detected, body reacts using HPA and SAM, fight or flight response
What happens in the resistance stage of GAS?
If the stressor persists, adrenal medulla activity decreases (SAM), adrenal cortex activity increases (HPA).
On the surface body seems to be normal, but physiologically it is deteriorating: immune system less effective and resources depleted (hormones, neurotransmitters, etc)
What happens in the exhaustion stage of GAS?
The body can no longer cope, the defence systems are exhausted, initial symptoms of SAM return (heart rate, sweating, etc), adrenal glands overworked and damaged.
Likely to suffer diseases of adaption (common cold, CHD, high blood pressure, etc)
What is the supporting evidence for GAS?
Selye exposed rats to harmful stimuli, similar responses
He also found similar results from observations of humans
GAS is universal
What are 2 weaknesses of GAS?
Doesn’t consider individual differences, some have cognitive coping strategies, not generalisable.
The illnesses in the exhaustion stage may not be from depletion of resources - research has shown no depletion of resources after extreme stress, now it is believed to be from high stress hormone levels
What are the practical applications from GAS?
Could lead to development of stress reduction programmes to improve health, benefits economy since less time off work
What are cardiovascular disorders?
Disorders of the heart and circulatory system e.g. high blood pressure, strokes
What effects does adrenaline have on the heart and circulatory system?
Increased heart rate - takes a toll over time.
High blood pressure due to constriction of blood vessels, causes wear and tear.
High blood pressure - dislodge plaque off the walls, lead to blocked arteries, leads to heart attacks/strokes
What was Wilbert-Lampen et al’s aim?
To investigate whether stress is linked to cardiovascular disorders
Who conducted a study into stress and cardiovascular disorders?
Wilbert-Lampen et al
What was Wilbert-Lampen et al’s procedure?
Looked at frequency of heart attacks in Germany during matches Germany played in the 1996 World Cup (deemed an acute stressor)
What were Wilbert-Lampen et al’s findings?
Cardiac emergencies increased by 2.66 times
What were Wilbert-Lampen et al’s conclusions?
Arousal of the sympathetic branch of the ANS is linked to cardiovascular disorders
What is immunosuppression?
The reduction of the body’s immune system response
Who conducted a study into stress and immunosuppression?
Kiecolt-Glaser et al
What was Kiecolt-Glaser et al’s aim?
To investigate whether the stress of an important exam had an impact on immune system functioning
What was Kiecolt-Glaser et al’s procedure?
Natural experiment
Take blood samples 1 month before the exams (low stress condition) and the day of the exam (high stress condition)
Looked at natural killer (NK) cell activity (part of immune system response)
Questionnaire of life events and loneliness scale
What were Kiecolt-Glaser et al’s findings?
Immune system functioning reduced
NK cell activity was significantly reduced in high stress condition
Immune systems were especially weak for those experiencing life events and were lonely
What were Kiecolt-Glaser et al’s conclusions?
Short-term, predictable stressors reduce immune system functioning, also affected by psychological variables so long-term stressors have more reduction of immune system functioning than short-term
What was Kiecolt-Glaser et al’s sample?
75 first-year medical students (49 males, 26 females)
What is the challenging research of Kiecolt-Glaser et al’s research?
Segerstrom and Miller’s meta-analysis of 300 studies. Different stressors have different effects:
Acute (short-term) stressors (e.g. presenting to an audience) increase NK cells, increasing immune system functioning.
Everyday stressors (e.g. an exam) have no impact.
Chronic (long-term) stressors (e.g. caring for a permanently ill family member) decreased immune system functioning.
What are the 2 weaknesses of research into the role of stress in illness?
Research is correlational so no cause and effect, health is slow to change, uncertain which stressor has an impact - we would need to monitor many individuals over a long time - impractical and expensive - so we can’t draw confident conclusions.
Doesn’t consider individual differences e.g.
1) Women show more adverse changes in their immune system after marital conflict.
2) Stress has a greater impact on immune systems as people get older.
3) Some people respond to stress with higher blood pressure/heart rate, so more cardiovascular disorders.
These factors not considered in the complex human response to stress
What is workload?
The amount of effort and/or activity involved in a job (also known as job demand)
What is job control?
The extent to which a person feels they can manage aspects of their work such as deadlines and work environment
What is workplace stress?
Aspects of our working environment that we experience as stressful (cause a stress response)
What is the job-strain model?
A model that suggest the workplace creates stress in 2 ways: high workload and low job control
What was the aim of Marmot et al’s study?
To investigate the effects of workload and control in the workplace on illness (CHD - Coronary Heart Disease)
What was the procedure of Marmot et al’s study?
10,000 male and female civil service employees.
Questionnaire related to their role assessing job control, workload, and social support. Also tested for signs of CHD (then reassessed for CHD 5 years later)
What were the findings of Marmot et al’s study?
No correlation between workload and CHD.
Negative correlation between job control and CHD
What were the conclusions of Marmot et al’s study?
Illness (CHD) is associated with low job control but not high workload
What was the aim of Johannson et al’s study?
To investigate the effects of workload and control in the workplace
What was the procedure of Johannson et al’s study?
Natural experiment, matched pairs.
Group 1 had high workload and low control, Group 2 had low workload and high control.
Recorded daily levels of adrenaline on work days and weekends, self-reports of job satisfaction and illness
What were the findings of Johannson et al’s study?
Group 1 had higher levels of adrenaline, especially on work days, higher levels of absenteeism, reported more illness, felt a greater sense of social isolation
What were the conclusions of Johannson et al’s study?
Low job control and high workload are associated with stress and stress-related illnesses
What are 4 weaknesses of research into workplace stress as a source of stress?
Focuses on just a few potential causes of workplace stress - there are others e.g. pay, conditions, job security - confounding variables.
Questionnaires are subject to social desirability effects, also may overlook stressors - interviews may be a more valid method.
Lacks temporal validity - working environment everchanging: new technology, virtual offices, working from home.
Doesn’t account for individual differences. Some people are less stressed by low control, also under load causes stress so it’s an oversimplified view
What are life changes?
Events that require a considerable amount of readjustment for an individual e.g. marriage, divorce, moving house, bereavement.
Happen from time to time, not everyday
Who suggested life changes could lead to illness and how?
Holmes and Rahe - stress can lead to illness, and life changes are all stressful, good and bad
What was the aim of Rahe et al’s study?
To investigate whether there was a positive correlation between the number of life changes experienced and illness reported in a non-clinical population
What was the procedure of Rahe et al’s study?
Prospective study of 2664 navy personnel asked to complete adapted SRRS (SRE) for events 6 months prior to their tour of duty - this gives the LCU score.
Recorded anytime they visited the sick bay on board for 6-8 months as well as type and severity - this gives the illness score
What were the findings of Rahe et al’s study?
Positive correlation of 0.118 between LCU score and illness score.
Most evident in married men compared to young single sailors
What is the challenging evidence for the idea that life changes are an important source of stress?
Lazarus argued daily hassles have a stronger accumulative effect.
Another study found a positive correlation of 0.59 between daily hassles and next-day health problems, but no such correlation for life changes
What are the practical applications from the idea that life changes are an important source of stress?
Health professionals can better advise people - Advice Leaflets Therapy - benefits economy as less sick days
What are daily hassles?
Irritating, frustrating, distressing demands that humans face on a day-to-day basis
How do daily hassles cause stress?
An accumulation of minor daily stressors creates persistent irritation, frustration and overload which then results in more serious stress reactions such as depression and anxiety
What was the aim of Bouteyre et al’s study?
To investigate the relationship between daily hassles and depression in students during the transition period between school and university
What was the procedure of Bouteyre et al’s study?
233 French first-year psychology students completed the hassles part of the HSUP and the Beck Depression Inventory. Also 2 other self-report measures based on coping with stressful situations and social support.
89% female, 11% male, average 20 years old
What were the findings of Bouteyre et al’s study?
41% showed depressive symptoms.
Positive correlation of 0.33 between HSUP scores and the likelihood of depressive symptoms.
Identified 5 key hassles: fear of the future, medical care, transport, lack of free time, physical appearance
What is the supporting evidence for the idea that daily hassles are an important source of stress?
Kanner et al’s longitudinal study found daily hassles were a more accurate predictor of stress related problems than life changes
What is a weakness for the idea that daily hassles are an important source of stress?
Correlational - no cause and effect, may be intervening variables (e.g. being depressed) which makes them more likely to report daily hassles and illness
Who designed the SRRS and what does it stand for?
Social Readjustment Ratings Scale, designed by Holmes and Rahe
How many life changes are on the SRRS?
43
What does a high LCU mean?
More adjustment is needed for that life change
How was the SRRS developed?
Holmes and Rahe examined 5000 patient medical records and identified the 43 life changes.
394 ‘judges’ decided the LCU for each life change against marriage which was given a baseline of 50.
An average of these were taken
How does a participant use the SRRS?
Asked to tick which life events they have experienced within a specific time period.
Researcher then adds up the LCU for the ticked life changes (participant doesn’t see LCU values for each life change)
What does LCU stand for?
Life Change Unit(s)
A score of less than 150 LCUs means what?
You are likely to be reasonably healthy in the following year
A score of 150-300 LCUs means what?
You have a 50% chance of experiencing illness in the following year
A score of more than 300 LCUs means what?
You have an 80% chance of experiencing illness in the following year
What does HSUP stand for and who designed it?
Hassles and Uplifts Scale, designed by Kanner et al
Why was the HSUP designed?
To find a correlation between daily hassles and stress-related illnesses.
And to see if daily uplifts offset the negative effects of daily hassles
What are daily uplifts?
Small, pleasant, enjoyable things that give people a boost and make them feel better
How was the HSUP developed?
Kanner et al asked research staff to generate a list of hassles and uplifts, this led to 117 hassles and 135 uplifts
How many hassles and uplifts are there on the HSUP?
117 hassles and 135 uplifts