Biologica Approach & circadian rhymths Flashcards
What problems can occur from jet lag and shift work ?
(3) poor attention , impaired reaction time & reasoning skills
What happens when you have an intake of alcohol?
Decrease time taken to fall asleep & lessens amount of sleep
Describe the SCN ?
-main endogenous pacemaker, neurones project from SCN to pineal gland which releases melatonin
How to measure sleep ?
EEG-electroencephalogram-brain activity EOG-eye. EMG-muscle activity. ECG-heart
What is endogenous pacemakers ?
Internal biological rhythms , SCN
Describe the external factor light ? (Zeitgebers)
Light can be dectected through other areas of body not just eyes and can be a powerful zeitgeber
What happens when you have an intake of nicotine ?
Addictive effect of nicotine means that smokers tend to wake in night craving cigarettes (30min-2hr)
What happens when you have frequent shift patterns ?
Results in more negative effect , (5) - fatigue ,sleep ,memory loss , mood swings ,reduced productivity and low staff morale
Examples of circadian rhythms ?
-sleep /wake cycle , appetite for food ,temp & hormone levels
What are circadian Rythms ? What they do /purpose?
Body has a way of keeping track of time (circadian clock) , called circadian rhythms -body’s natural processes that vary over a 24 cycle
Where is the hormone sleep released ?
The sleep hormone melatonin is released from the hypothalamus (SCN)
What is sleep ?
Sleep can be defined as a state of reduced conscious awareness during which the body is less active and less responsive to the outside world
What is the fourth stage of sleep ?
Sleep gets gradually deeper & delta waves become more common which dominate EEG readings only loud noise /shaking will wake u up (body temp & BP decreases)30 mins
What is the second stage of sleep ?
-20 mins becomes less responsive however woken might not realise sleeping .sharp spikes of electrical activity called sleep spindles ,theta waves ,muscles relax , breathing heart rate drop
What did Philips & danner 1995 find (smoking)?
That smokers are more likely than non smokers to report falling /staying trouble sleeping