Stress and Illness – Key point If you repeatedly turn on the stress-response, or if you cannot appropriately turn off the stress- response at the end of.

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Presentation transcript:

Stress and Illness – Key point If you repeatedly turn on the stress-response, or if you cannot appropriately turn off the stress- response at the end of a stressful event, the stress- response can eventually become as damaging as some stressors themselves. A large percentage of stress-related diseases are disorders of excessive stress-response. Robert Sapolsky– (show clips from Stress – Portrait of a Killer)

Stress and Illness – What is the relationship between stress and illness? –Stress changes in physiology –Stress changes in behaviour Moderating factors: Coping, social support, personality, and control

Health Consequences of Negative Emotions

Coronary Heart Disease and Stress Rates of CHD is higher in those with high stress jobs. Why? –BP chronically elevated (wear and tear!) –Epi  circulating platelets clump together –Atherosclerosis (plaques) Kaplan’s research with monkeys (re: social stress & unstable hierarchy)

Immunity and Stress T cell

Immune System Overview

Psychoneuroimmunology (PNI) Subfield of health psychology that emphasizes the interaction of psychological, neuroendocrine, and immunological processes in stress and illness An individual’s psychological state influences the immune system via the nervous system

PNI: From stressor to illness The magnitude and frequency of the stress response regulate immune competence (e.g., via glucocorticoids) Level of immune competence determines susceptibility to disease

PNI Studies Immunosuppression has been linked to divorce, bereavement, unemployment, exam periods, occupational stress, and stressful bouts of exercise –e.g., Life stress and exposure to cold viruses Wound studies (Kiecolt-Glaser) Animal studies show that tumor cells grow more rapidly in animals exposed to electric shock, loud noise, or other stressors

Sapolsky’s baboons Primate Research Findings: High and Low Social Status –High cortisol is associated with low social status (instability and less controllability) –Low status – Fewer lymphocytes and weak immune system

Sapolsky’s baboons Studies with dominant male baboons suggest that attitude (“personality”) and “culture” are also important (i.e., just being alpha male isn’t necessarily good, if one is high- strung about it…) Forest-troop (killed by dump TB)

In humans…