Bio. rhythms are cyclical changes in the way bio. systems behave. They are driven by pur body's internal 'clocks' called endogenous pacemakers (e.g. SCN) but exogenous factors(e.g. light, time, social cues) also have an influence --> We need to respond to environ. changes to function - not every part responds quickly = de-synchronisation--> Two most common types: jet lag & shift work
Shift work - pattern of working during the night & sleep during day so out of sync w/influence of zeitgebers --> Shift works leads to:
Decreased alertness .. 'circadian trough' ..midnight-4am when cortisol & body temp. lowest
Sleep deprivation - daytime diff. to sleep (noise/daylight) ..typically 2 hours shorter than normal nocturnal sleep; REM in particular affected --> Lack of sleep makes coping w/circadian trough diff.
KNUTSSON - shiftworkers for 15+yrs 3x likely as non-shiftworker to heart disease --> MARTINO - suggests could be due to direct effect of desynchronisation of rhythms or indirect such as sleep deprivation
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