Circadian rhythym

Question 1

Ultradian Rhythm

Answer 1

Many in 24 hours
REM

Question 2

Infradian Rhythm

Answer 2

Longer than 24 hours to complete
Menstruation cycle

Question 3

Circadian Rhythm

Answer 3

Lasts around 24 hours
sleep-wake cycle

Question 4

Sleep wake cycle - internal vs mechanisms

Answer 4

Exogenous zeitgebers - night time drowsy, day time alert

Endogenous pacemaker - released hormones

Question 5

Siffre’s cave study

Answer 5

Several days underground to study the effects on his own biological rhythm
Deprived exposure of natural light + sound
Biological rhythm beyond 24 hours
Regular sleep wake cycle

Question 6

WW2 bunker study

Answer 6

4 weeks in ww2 bunker deprived of natural light
Most displayed circadian rhythm between 24-25 hours

Question 7

Core body temperature

Answer 7

Body temperature lowest (36 C) at 4:30 AM
Highest (38 C) at 6:00 PM
Sleep = temp drops
Rise during last hours of sleep

Question 8

AO3

Answer 8

Poor control
Cave study still had light - Artificial lamp
Research used dim light - vary from 22-28 hours

Practical applications
Research better understanding of negative consequences of disrupting circadian rhythm
e.g night workers , accidents more likely to happen at 6am

Drug treatment
Circadian rhythm coordinate processes- hormone levels, heart rate
Revealed certain peak time, drugs more effective
development of drugs and dosages