Biological rhythms (Circadian,Ultradian,Infradian)

Question 1

Circadian + example

Answer 1

• Approximately 24 hours
• E.g. eating

Question 2

Ultradian + example

Answer 2

• More than once a day
• E.g. eating

Question 3

Infradian + example

Answer 3

• Longer than a day. E.g. monthly
• E.g. menstrual cycle

Question 4

Circannual + example

Answer 4

• Approximately one year
• E.g. reproduction

Question 5

Siffre et al (1972) - (6 points)

Answer 5

• AIM :
• To investigate what it would be like for astronauts in space, where there were no external cues to affect our biological rhythms.
• PROCEDURE :
• Siffre went into a cave for 6 months and has food, water, a bed and a chair.
• When he thought it was daytime, he would tell his research team ; who would then turn the lights on. And vice versa when it was night.
• Siffre became lonely and despondent.
• His mental health, memory and eyesight were all negatively affected.
• Sleep wake cycle was 25 hours.
• RESULTS :
• Concluded that astronauts could manage their biological rhythm, without external cues, however will need a companion.