Stress
Covering the body's biological reaction to stress, key studies and treatments
- Created by: Catrin Podgorski
- Created on: 26-03-11 12:42
Physical Symptoms of Stress
- Lack of appetite
- Craving for food when under pressure
- Insomnia
- Headaches
- Nail biting
- Nervous twitches
- Constipation or diarrhoea
- Frequent heartburn or indigestion
- Tendency to sweat for no good reason
- Nausea
- Breathless with exertion
- Fainting spells
- Frequent crying or desire to cry
- Impotency or frigidity
- Inability to sit still without fidgeting
- High blood pressure
Mental Symptoms of Stress
Mental Symptoms:
- Constant irritability with people
- Feeling unable to cope
- Difficulty in making decision
- Awareness of suppressed anger
- Lack of interest in life
- A feeling of being a failure
- A feeling of being bad or self-hatred
- A feeling of ugliness
- Inability to show true feelings
- Loss of sense of humour
- Feeling of neglect
- Dread of the future
- Difficulty concentrating
- The inability to finish one task before rushing on to the next
SAM
First response (startle response) is immediate and operates within 30 seconds of a threat. This is the Sympathetic Adrenal Medullary (SAM) response.
Process:
Sympathetic Adrenal Medullary -> Adrenal Medula -> Releases Adrenaline
Effects:
- Pupils dilate
- Breathing rate increases
- Heart pumps harder and faster
- Blood supply to the legs increase
- Shuts of your digestive and reproductive systems
- Adrenaline is released from the adrenal glands on the kidney
HPA
If the stress is prolonged then the "back-up system" responds and this is the Hypothalmic Pituitary Adrenal Access (HPA) response.
Process:
Hypothalmia Pituitary Adrenal Access -> Pituitary gland (releases Cortico Releasing Factor) -> Adreno Cortico Trophic Hormone ->Releases Cortisol
Effects:
- Pupils contract
- Slows heart beat
- Constricts bronchi
- Builds up energy for future use
- Stumulates activity in the digestive/reproductive systems
Effects of stress
Seyle's GAS (General Adaptation Syndrome) Model:
Effects of stress
Immune system
Night - body produces TH1 cells
Day - body produces TH2 cells
- With the stress response, one loses sleep therefore producing less TH1 cells and comprising one's immune system
- Low TH1 cells mean that abnormal body cells are not recognised and you are more susceptible to cancer
- TH2 cells link to inflamory responses so with a lack of cells, one will suffer from spots, IBS, constipation and infection cannot be fought as well
Studies
Segerstrom and Miller
- Meta analysis of 293 studies over 30 years
- In the short-term your immune system can be benefited
- Long-term chronic stress leads to the suppression of the immune system, the most chronic stressors associated with the global supression
Cohen and the cold
- 392 healthy participants
- Gave participants nasal drops with 5 common cold ciruses
- After two weeks 1/3 had a cold
- Those who had contracted a cold scored highest on the physicological stress scoring system
- Direct correlation between high stress levels and susceptability to a cold
- Lab setting - high control
- Took individual differences into account (weight, smoking etc)
- Unethical giving someone a cold
Further studies
Kiecolt and Glaser
- Used 75 medical students (notoriously the most hard worked students)
- Took blood samples from them a month before/during their final exams
- White blood cells were considerably lower in the sample from during their exams
Carer study
- Carers (average 8 years care of Alzheimer's patients) scored much higher than controls on a stress questionnaire
- A small wound was created on the forearm
- The average time taken for the wound to heal was 48 days - the control group was 39 days
- Caregivers were on medication and there was a small sample size
- Unethical? Though the carers would know how to keep said wound clean
Personality type
Type A
- Impatient
- Competitive
- Hostile cynicism
- Frustration
- Aggression
- Cortisol build up from being more stressed than Type B
Type B
- Patient
- Cooperative
- Easygoing
- Laidback
N.B: Type C is Type A repressed (more likely to get cancer from lack of TH1 cells as explained earlier) and Type D is Distressed.
Type A
A Type A personality is dangerous and can lead to:
- Hypertension
- Coronary Heart Disease (narrowing of the Coronary Arteries from high blood pressure from extra Cortisol)
- Stroke (again, disruption of blood flow to the brain from narrowing blood vessels from Cortisol)
- Stress from a Type A personality also leads to increased glucose levels leading to clumps blocking the artery
- Stressed individuals are also more likely to engage in unhealthy behaviours e.g. smoking, drinking, drug taking and binging.
Studies into Type A Personality
Williams
- 13,000 healthy people completed a 10 question anger scale
- Six years later 256 had experienced heart attacks
- Those who had scored highest on the anger scale were over 2.5 x more likely to have a heart attack
Friedman and Roseman:
- 3524 Calfornian men aged 39 - 59 (all free from CHD)
- After 8.5 years, 7% had some signs of CHD and 2/3 of those men were Type A and no overly-strong correlation - only 7%
Men and heart attacks
- 500 men with 13.2% annually at risk of a heart attack
- Given sounselling designed to reduce Type A behaviour (and hostility)
- Reduced to 7.2% annually at risk of further heart attacks
Social Readjustment Rating Scale
Holmes and Raye created the Social Readjustment Rating Scale giving each Life Event a "mean value" of Life Change Unit (LCU) showing how stressing it will be on the person experiencing it e.g. Death of a spouse has a LCU of 100.
Kannet et al also created a similar scale of "The Hassles of Middle-aged Adults." It was a simple rating of concerns of adults on a scale of 1 - 10, with the most distressing thought for an adult being number 1 (Concerns about weight.)
Rahe did a quesstionnaire of life events experience over the previous six months with the illness score calculated on the 7 month tour of duty of Navy soliders and found that a LCU of 118 was given. There was no strong correlation but the number was significant.
Job stress
Johansson et al
- Researcher identified a high-risk group of 14 finishers in a Swedish sawmill
- The job was machine-paced, isolated, very repetitive yet highly skilly
- They were compared with a low-risk group of 10 cleaners whose work was more varied
- The high-risk group secreted more stress hromones on work days than on rest days and higher levels than the control group
Marmot et al
- Job strain model - 7372 civil servants (from London)
- High workload creating greater job demands
- Low job control over deadlines and procedures
- Higher grade employees would experience a high world load whereas lower grade exployees would experience low job control
- No link between high workload and stress-related illness in the higher grades
Coping with stress
(If you are too stressed then you cannot solve anything at all)
Problem focussed coping:
N.B: If the problem cannot be solved then this is a limitation
- Thoughts or action acting directly on a stressful situation
- Seeking information
- Emotional regulation
- Direct action
- Planning
- Decision making
Emotional focused:
N.B: Doesn't solve problem direction but a change of emotion may help solve problem.
- Talking to a friend
- Support seeking
- Distraction
- Doesn't tackle the problem itself
Hardy personality
Kobasa
- The Hardy Personality - to see situations as challenges
- Control - in stresssful situations you need control
- Commitment - problem focused
- See stress as a challenge - eustress
- Social support - women (though a social network can also cause stress)
- Exercise - gender approach
The Transactional Model of Stress - Cox/EEA - Environmental enolutionary approach
Primary appraisal: Is it a threat? Is it a challenge?
If it is a challenge/threat then move on to the secondary appraisal.
Secondary appraisal: Can I cope? Do I have the resources?
If you do not have the resources then you will feel negative stress
If you do then it becomes eustress (positive stress)
Hardiness
Klag and Bradley
- Assessed hardiness, neuroticism, stress, symptoms of illness and approach/aviodance coping
- Male and female staff at an Austrailian University
- Commitment and control correlate negatively with stress and illness
- Neuroticism was the most significant thing
- Neuroticiam may be the cause as commitment, challenge and control were non-significant if neuroticism was controlled
- Adverse effects of stress on health are significantly less on hardy men and it acts as a buffer
- Benefits of hardiness are not linked to emotion/problem focussed coping
Stress and drugs
Beta blockers:
- Contain Beta Adrenergic blocking drugs
- Fills the adrenaline receptor so it cannot affect the heart during the stress response
- Good for people with heart disease
- Can up the effects of obesity
- Can cause sleep disturbance and muscle fatigue
Buspirone
- Treats Generalised Anxiety Disoder
- Shows no signs of addiction or dependancy
- Different from Benzodiazipines
- Acts against seritonin
- Headaches
- Better tolerated
Stress and drugs
Barbituates
- "Sleeping tablets"
- Easily addictive
- Serious side effects - cognitive impairment
- Tolerance can be built up
- Depresses CNS (physical effects)
Benzodiazipines
- Minor tranquilisers
- Increase the action of the neurotrnasmitter
- Mimcs the body's stress relievers
- Effective with the greater majority of people
- Rapid onset of action and can reduce stress quickly and are generally well tolerated for a short period of time
Stress and drugs
SSRI - Selective Seritonon Reuptake Inhibitor
- Used effectively to treat depression - effective in the exhaustion phase
- Most common
- Leaves seritonin in the synaptic gaps
- 80% effective against depression
SIT - Stress Inoculation therapy
- Adv:
Conceptualisation
Review of past situations, realistic understanding of demands
Sources stress and works on coping strategies
Real life application - Disadv:
Requires time and commitment
Changing behaviour will always be difficult
Stress and anxiety levels (through personality) are difficult to change
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