Distruption Of Biological Rhythms Flashcards
Which is easiest?
West to East
OR
East to West
East to west
What’s one criticism of Recht’s research?
Some teams could’ve just been better
In Klein et al’s research, how long did it take for the body to reset when travelling East to west?
1 day
Name four symptoms of jet lag
Fatigue Headaches Sleep disturbances Irritability Stomach disturbances Disorientation
In Klein et al’s research, how long did it take for the body to reset when travelling west to east?
6 days
What were Recht’s results?
East to West = 44% wins
West to East = 37% wins
What’s practical application does research on endogenous pacemakers and sleep have?
Melatonin can be used to induce sleep and relieve symptoms of jet lag
What practical application does shift work have?
Changing shifts to phase delay
Increasing shift rotation
Use of bright lights
East to west is phase…
Delay
Jet lag occurs when…
…the individual crosses time zones and districts the circadian and ultradian rhythms.
What’s a IDA of the jet lag explanation?
It’s deterministic. It suggests that the individual can’t override their endogenous body clock.
What evidence is there for the circadian trough resulting in poor performance?
Chernobyl and the Three Mile Island
Who studied the U.S. Baseball team?
Recht et al
What did Czeisler do to the Utah Chemical plant? Discuss
Changed rotation to phase delay and increase it from 7 days to 21 to allow workers to adjust.
Resulted in increased worker satisfaction, less accidents and higher output
What happens between 12am and 4am?
Circadian trough
Body temperature at its lowest
Cortisol at its lowest
Decreased alertness
West to east is phase…
Advance
What two issues does shift work raise?
The circadian trough and health problems
Why does shift work result in health problems?
Difficulty sleeping ⬇️ Less hours of sleep ⬇️ Poor cognitive and physical performance and illness such a as type two diabetes and hypertension etc.
What did Dawson and Campbell do?
Had employees work under 4 hour pulse of very bright light on their first night shift.
Found that body temperatures didn’t fall as much and therefore the bright light must have lastly reset they’re endogenous clocks
⬇️
Improve health of shift workers
Who conducted research that disputes the idea that whether you get jet lag is deterministic? Discuss.
Fuller et al
Fasting and then eating during the social customs of the destination can inhibit jet lag because the endogenous clock resets itself. Therefore we are able to override out internal body clocks
Who’s said “more problems occur when rotating shifts”
Gold et al
What’s did Czeisler suggest?
Use of very bright lights can rest biological rhythms writhing 3 days
How long did Recht’s study take?
3 years
