ultradian and infradian rhythms Flashcards

1
Q

infradian rhythms

A

biological rhythms that take longer than 24 hours to complete full cycle

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2
Q

ultradian rhythms

A

biological rhythms that last under 24 hours

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3
Q

2 topics in ultradian rhythms

A

sleep cycle

basic rest activity cycle (brac)

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4
Q

sleep cycle

A

one fulll cycle = 90 min
5 distinct stages of sleep
cycle repeats itself loads per night

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4
Q

What happens during Stage 1 of sleep?

A

Light sleep, muscle activity slows, and it’s easy to be woken. Alpha waves are present.

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5
Q

Stage 2 of sleep

A

slightly deeper sleep, breathing and heart rate slow. Theta waves are present.

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6
Q

stage 3 of sleep

A

Deep sleep begins, it’s harder to wake someone, and slow delta waves start appearing.

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7
Q

stage 4 of sleep

A

Very deep sleep, it’s difficult to wake someone, and the brain produces delta waves. Rhythmic breathing occurs with limited muscle activity.

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8
Q

stage 5 of sleep

A

Rapid eye movement occurs, dreaming happens, brainwaves speed up, the heart rate increases, breathing is rapid and shallow, and the body is paralyzed.

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9
Q

kleitman 1969

A

He suggested that a 90-minute cycle of alertness followed by fatigue continues throughout waking hours.

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10
Q

what was the key finding from Ericsson et al. (1993) regarding BRAC in violinists?

A

The best performers practiced in 90-minute sessions with breaks in between to recharge.

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11
Q

ao3 strength ultradian

A

p- supporting research that suggests there’s qualitivately different stages in sleep

e- dement and kleitman investigated when dreaming occurs in sleep, monitored EEG records and found that participants woken during REM sleep reported dreams 80-90% of the time.

E – REM activity during sleep correlated with dreaming, brain activity varied
according to how vivid dreams were.

L – The study suggests that REM sleep is a distinct ultradian rhythm and an
important component of the ultradian sleep cycle.

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12
Q

ao3 strength ultradian

A

P – Research support for the BRAC comes from studies of elite performers.

E – Ericsson (2006) found elite violinists practice sessions were usually limited
to a duration of no more than 90 minutes, with practice distributed during the day
into 90 minute segments.

E – His research also indicated that violinists frequently napped to recover from
practice and he discovered the same pattern among other musicians, athletes,
chess players and writers.

L – This supports the existence of a 90 minute ultradian cycle of alertness and
fatigue.

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13
Q

2 topics in infradian rhythms

A
  • menstrual cycle
  • seasonal affective disorder
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14
Q

menstrual cycle

A

-influenced by monthly changes in hormone levels
-which regulate ovulation
- average length of cycle - 28 days
- between 24-35 days = normal

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15
Q

how many hormones regulate the cycle

A

4

16
Q

all 4 hormones and their functions

A

fsh - causes the egg to mature

lh- causes eg to be released

oestrogen, inhibits the production of fish, and encourages production of lh, to ensure only 1 egg matures each month

progesterone , causes te lining of the uterus to thicken in preparation for a fertilised egg to be implanted

17
Q

Stern and McClintock’s

A
  • studied 29 woman with irregular menstrual periods participated in the study
  • samples of pheromones were taken from 9 woman, at diff stages of menstrual cycle
  • samples were treated w alc and frozen
  • to be rubbed on upper lip of 20 other ppts
  • on day 1 , pads from the start of menstrual cycle were applied to all 20 woman, and etc
  • found that 68% of women experienced changes to their menstrual cycles brought them close to the cycle of their ‘odour donor’
  • provides that endogenous menstrual cycle can be influenced by exogenous facts ( cycles of other woman)
18
Q

seasonal affective disorder

A
  • Mental disorder causing depression in winter, with recovery in summer.
  • Shorter daylight hours and longer nights in winter affect hormone levels.

-Lower levels of serotonin (the “happy” neurotransmitter) are linked to depression.

  • increased melatonin levels during winter due to longer darkness, which induces sleep.
    Darkness triggers melatonin production.
19
Q
A

P – There is research support for the existence of an infradian rhythm for the menstrual cycle.

E – Stern & McClintock studied 29 women with irregular periods. Samples of pheromones
were gathered from 9 of the women at different stages of their menstrual cycles. The samples
were treated with alcohol and frozen, to be rubbed onto the upper lip of the other 20
participants.

E – They found that 68% of women experienced changes to their menstrual cycle which
brought them close to the cycle of their ‘odour donor.’

L – This provides evidence that there is an infradian rhythm for the menstrual cycle, and it can
be influenced by exogenous factors (the cycles of other women).

20
Q

ao3 infradian

A

Infradian – Methodological issues

P – However, the methods used in these early synchronisation studies can be criticised for
having too many confounding variables

E – For example, stress, diet, exercise and many more factors can all influence a woman’s
menstrual cycle, meaning the findings of studies like McClintock’s could be less valid than
first thought.

E – Moreover, research in this area tends to use small sample sizes and relies on self-report
data from participants, further questioning the validity and generalisability of results.

L – This suggests that findings from early research into the menstrual cycle should be taken
with caution as they may be less valid than previously thought.