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Stress Lecture # 6.docx

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Kinesiology & Health Science
KINE 1020
Jennifer Kuk

HH KINE 1020 03/10/2012 Lecture # 6 Stress What is Stress?  Hans Selye o “non-specific response of the body to any demand made upon it” o Stress is important in life  Without it you do not thrive  Distress o Death of a close friend o Feeling overwhelmed  Eustress o Going out on a date o Getting a promotion Stress Hormones  Having no stress hormones causes illness: o Addison’s Disease  Muscle weakness and fatigue  Weight loss and decreased appetite  Low blood pressure  Low blood sugar Adaptation Syndrome HH KINE 1020 03/10/2012 Lecture # 6  Stressor o Neurogenic  Perception of failing an exam  All emotional  No real metabolic threat o Metabolic  Elevation of eating habits o Physical  Chronic pain  Stress response o Sympathetic Nervous System  Shuts down digestion  Increases heart rate and breathing rate o Hypothalamic Pituitary Adrenal (HPA) axis  Secrete cortisol Physiological Response to Stress  Nervous System o Autonomic Nervous System  Parasympathetic nervous system  Sympathetic nervous system o Endocrine system  Hypothalamo-pituitary-adrenal system and associated hormones (ACTH, Cortisol, catecholamines)  Stress response-1 o Nervous System response to stress- The Locus Coreuleus HH KINE 1020 03/10/2012 Lecture # 6  Pacemaker of the brain  Connected to our sense  Causes nor-epinephrine secretion  Increases arousal and vigilance, and modulates the action of the autonomic nervous system  Regulates blood flow, heart rate, blood pressure, and respiration  Shuts down the gastrointestinal and sexual systems until the crisis is over  o The Limbic System and the HPA  Functions:  Sets emotional tone stores emotional memories modulates motivation controls appetite and sleep cycles modulates libido  Problems if over activated:
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