The Consequences of Disrupting Biological Rhythms. The Effects of Shift Work and Jet Lag Strategies to Minimise the effects of shift work and jet lag. BATs AO1 -Identify and describe at least two consequences of disrupting biological rhythms (jet lag and shift work)
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The Effects of Shift Work and Jet Lag
Strategies to Minimise the effects of shift work and jet lag
AO1 -Identify and describe at least two consequences of disrupting biological rhythms (jet lag and shift work)
AO2 - Analyse and evaluate research into the effects of jet lag and shift work on biological rhythms
Fill in the revision sheets about Bio-rhythmsLessons 7 and 8 – The consequences of disrupting biological rhythms
How did it make you feel physically and mentally?
The causes of the accident are still described as a fateful combination of human error and imperfect technology.
The Exxon Valdez oil tanker struck Bligh Reef, off the coast of Alaska, at around 12:04 am March 24th, 1989.
The accident resulted in the discharge of approximately 11 million gallons of oil 20% of the cargo, into Prince William Sound.
The third mate failed to properly manoeuver the vessel, possibly due to fatigue and excessive workload
health and well being.
More difficult to sleep in day:
Consequence is sleep deprivation – makes circadian trough worse!
Knutsson (1986) – many studies show significant relationship between shiftwork and heart disease.
Those who worked shifts for over 15 years3x more likely to develop heart disease
Individual differences – Reinberg et al 1984
Some workers are able to cope with shifts because their rhythm changed less
Shift workers also experience social disruption – can’t spend time with friends and family
Gold et al 1992 - More problems with rotating shifts than fixed shifts (all nights)
Harmful effects can be reduced
If rotating shifts are unavoidable Phase delay (get up and go to bed later) is less disruptive than phase advance (get up and go to bed earlier)
Czeisler et al 1986 Bright lights can mimic the effect of daylight and re-set body rhythms (temp and cortisol) in 3 days (usually takes 9 days to adjust to a phase advance of 6 hours).
The strong light entrains all rhythms not just the sleep wake cycleCommentary on Shiftwork
Read ‘Reducing the harmful effects’ section on p9
Use this and what you have learned about the effects of shiftwork to write a letter or an info sheet for a new company about to employ shift workers
Phase delay. Easier to cope with – like going to bed later
Will be ready for bed earlier, but biological clock will wake us up earlier too
West to East
Phase advance – harder – like getting up earlier
Trying to adjust to a shorter day so disruption to circadian rhythm is more pronounced
Daylight, social zeitgebers and clocks tell us it is morning when we may still be wanting to sleepDoes the direction of travel make a difference to jet lag?
Recht et al 1995 – jet lagged baseballers p8
Sleep can be disrupted in other ways when travelling.
Stokkan et al 2001 – timing of meals can re-set the bio-clock in the liver – increases enzyme production at the right time for digestion avoiding stomach upset
Bright lights – Go out in bright daylight on first few days in a new time zone to reset body clock
ago leading to mild sleep deprivation
In other words create a plan for an essay on Disruption of Biorhythms
( Knuttson et al 1986, Winter et al 2008, Recht et al 1995, Tilley and Wilkinson 1982)
Use p9 qu 1-4 to help you
If you fancy more of a challenge try q 5 p9