stress, depression & mindfulness. teaching mindfulness based stress reduction – beginning of...
TRANSCRIPT
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Stress, Depression & Mindfulness
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Teaching
• Mindfulness Based Stress Reduction –
• Beginning of the story
• Science seems to help motivation-universal language
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Stress
• That change is needed to meet a demand
• As appraised by the subject
• That change may overwhelm resources
• Resources as appraised by the subject
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Physiology of chronic stress =Physiology of depression
• Parasympathetic – sympathetic imbalance sympathetic activated too long
Not enough parasympathetic activationRest & relaxation Digestion & cellular maintenanceHealing & repair
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Not just the Brain
• Neurotransmitters
• Heart
• Immune system
• Endocrine system
• Sex Hormones
• Sleep
• Gut
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Key Brain Areas
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HPA axis
• Hypothalamus ( CRF) ->
• Pituitary Gland ( ACTH) ->
• Adrenals ->Noradrenalin
• -> Cortisol -> Hippocampus
• ( feedback loop)
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Acute stress reaction
• HPA activation
• Flood of neurotransmitters
• Adrenaline, noradrenalin
• Serotonin
• Dopamine
• Inflammatory response ( interleukin 1)
• cortisol
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Studies in chronic stress
• Whitehall Civil servant study
• Salposki Baboon studies
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Neurotransmitters
• Adrenaline , Noradrenalin
• Serotonin – first to go -> depression
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Chronic Noradrenalin
• Increases heart rate , Blood pressure
• Activates amygdala threat detector
• Hyper vigilance for threat
• Negative memory activated, positive memory deactivated
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The immune system
• Hyper activation of non-specific acute phase – Interleukin 1
• Suppression of specific immune actions
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Inter leukin 1
• Part of stress response
• With chronic activation
• Fatigue, malaise
• Sleep disruption, appetite effect
• Anhedonia
• Impairs hippocampus memory
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Effects of chronic cortisol activation
• Loss of diurnal variation
• Switches off prefrontal, hippocampus
• Suppress immunity
• Activate amygdala
• Burns out – adrenaline fatigue
• Weight gain
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Over time cortisol - neurotoxic
• Loss of connections
• Decreased branching
• Loss of neurons
• Especially prefrontal & hippocampus
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Damage to Hippocampus
• Blocks feedback loop -> increased cortisol
• Memory impairment
• Inability to form new associations
• (30,000 new cells per day)
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• Chronic stress stops Neurogenesis & Neuroplasticity
• Increase cortisol
• Decrease serotonin, trophic factor, oestrogen
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Oestrogen & depression
• Female : Male rate of depression 3:1
• Sudden drops of oestrogen associated • Menopause• Childbirth• Premenstrual
• Oestrogen – powerful Neurogenesis growth factor
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• Under active – hippocampus, prefrontal cortex & cingulate
• Overactive – amygdala, hypothalamus & Pituitary
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Prefrontal Cortex Asymmetry
• Left – approach behaviour, positive emotion – under active in depression
• Right withdrawal behaviour, negative emotion – overactive in depression
• Hedonic set point
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Heart rate variability
• Healthy heart - high variability
• Depression/chronic stress = reduction
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Sleep Cycle
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Sleep in depression
• Sympathetic>> parasympathetic
• Reduced slow wave sleep
• Increased rem density (predicts response to treatment)
• Insomnia – x4 incidence of depression
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Indicators of chronic sympathetic activation
• Difficulty concentrating
• Making decisions
• Remembering
• Excessive fatigue
• Motivation
• Frequent illness
• Sleep disturbance
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Paul gilbert slide here
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Activation of stress response
• Imagined scenario of threat/failure • Reality gap – life as you want it to be – as
it is • Self criticism• Recall of unpleasant event • Hostility • Rumination• Avoidance
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Filtering reality
• Activated Amygdala & No hippocampus
• Habitual mind – tells us what to see & how to react
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Mental filter
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Cognitive filter
• Beliefs, attitudes & perspectives
• Continuous stream of semiconscious commentary evaluating
• Somatically marked association & memory
• Neural networks – synapses reinforced – rehearsal
• Other associations shut down
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Example of 4 different filter types
• Anxious
• Depressed
• Type A – angry, hostile
• Type C – resigned helpless
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Anxious
• Imagined scenario – exaggeration of threat
• Potential crisis with each event
• Future – what if something goes wrong
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Depressed
• Continual comparison between some ideal & reality
• Self –critical evaluation
• Underestimation of resources & negative memory bias
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Type A
• The world is against me
• Always scanning for threat
• Easily made paranoid
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Type C
• Passive pessimistic and helpless
• Underestimate resources
• Overestimate threat
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Vicious Cycle
• HPA activation
• Physiology threat related cognitive filter
• Perceive threats and failure
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Mindfulness & Depression