Infradian and Ultradian rhythms Flashcards

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1
Q

What is an infradian rhythm?

A

A biological rhythm that occurs to a period of more than 24 hours

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2
Q

What are two examples of Infradian rhythms?

A

Menstrual cycle
Seasonal affective disorder

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3
Q

What is the role of oestrogen in the menstural cycle?

A

Rising levels of oestrogen cause the ovary to release an egg

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4
Q

What is the role of progesterone in the menstural cycle?

A

Thickens the lining of the womb, to ready it for pregnancy

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5
Q

What is seasonal affective disorder (SAD)?

A

A depressive disorder with a seasonal pattern, usually happening in winter months

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6
Q

What causes SAD?

A

As it is dark in the winter, more melatonin is secreted for a longer time.
This leads to decreased serotonin levels

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7
Q

What is a ultradian rhythm?

A

Span over less than a day, less than 24 hours

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8
Q

What is an example of an ultradian rhythm?

A

Sleep cycle

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9
Q

What waves in the brain do sleep stages 1-2 have?

A

Alpha and beta

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10
Q

What happens to the body during stages 1-2?

A

Heart rate slows and temperature drops

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11
Q

What waves are present in the brain during sleep stages 3-4?

A

Delta waves

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12
Q

What is another name for sleep stage 5?

A

REM

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13
Q

What happens during sleep stage 5?

A

The body is paralysed and brain activity resembles an awake person

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14
Q

What is a weakness of explaining the menstrual cycle as an infradian rhythm?

A

Individual factors may change the length of the menstrual cycle such as stress

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15
Q

What did tucker et al find about sleep stages?

A

He found large differences between participants in the duration of stages 3 and 4.
This makes it difficult to describe ‘normal sleep’

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