Chapter 12 Stress

Short Term Stress A response of the brain (Sympathetic) Immediate action is necessary Or anticipation that immediate action is necessary

Acute Stress Response

Changes is blood distribution

Mobilization of sugar and fat

Long Term Stress Prepare the body for continued action Increases the capacity of the system to make immediate stress responses –Replaces sugar in liver –Alters use of energy substrates by tissues other than the brain –Limits immune damage

Hypothalmic/Pituitary/adrenal axis: Glucocorticoids

Stress: Not all or nothing Stress

Stress Responses Development of increased capacity is dependent on the full response –Activation –Action –Long term stress to increase capacity

Incomplete Response

Variations in Stress Responses Cold Stress Starvation Learned Stress

Stress and Disease Chronic alert: Preparation for action followed by inaction Problems –Immunosuppression –Fat mobilization –Insulin resistance

Dealing with Stress Exercise Drugs