psych106-7

psych106-7 - Sleep and Circadian Rhythms Azim Khan, MS PSYC...

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Sleep and Circadian Rhythms Azim Khan, MS PSYC 106 – Intro to Physiological Psychology 01/31/12
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Smith, Guilleminault, & Efron, 1997 West Coast teams win more often Ü Win by more points Ü Against prediction by Las Vegas odds Ü Home field advantage enhanced for West, diminished for East Ø Why???
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Possible explanations Ü West Coast team superiority Ü Home-field advantage Ü Playing surface Ü Winning streaks Ü Sleep deprivation Ü Jet lag Ü Travel Ü East Coast teams play poorly on Monday Night Football Ü West Coast teams play closer to the time of day they train
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Circadian advantage Ü Enhancement of athletic performance when competing at certain times of day Ü When East coast teams play night games in the West, it feels later in the night to them Ü When West coast teams play night games in the East, it feels earlier in the day to them
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What is a circadian rhythm? What is a circadian rhythm?
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What is a rhythm? Ü Movement, fluctuation, or variation marked by the regular recurrence or natural flow of related elements Ü Ordered recurrence of strong and weak elements Ü Peaks & troughs Ü Recur with a particular periodicity
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Biological rhythms match environmental rhythms Ü Organisms evolved mechanisms to anticipate predictable changes Ü Fitness in a changing, predictable environment Ü Rhythmic movement or fluctuation/variation in anything physiological
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Biological and geophysical rhythms are connected Ü The earth rotates on its axis once per 24 h Ü Daily rhythms of light and temperature Ü Highly predicable changes
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Biological and geophysical rhythms are connected Ü Environmental Periodicity Ü Light (quantity and wavelength) Ü Temperature Ü Humidity Ü Barometric pressure Ü Magnetic field Ü Biological competitors, food availability, predators and potential mates Ü Tides
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Clocks and Rhythms Ü Rhythms are observable variations Ü Clocks keep time and control those rhythms Ü Diverse organisms have rhythms Ü Variation in what processes are rhythmic Ü Variation in what mechanism comprises the clock Ü This class: focus on mammalian rhythms
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How to measure biological time Hourglasses Ü Embryonic development [hours to years] Ü Reaching sexual maturity [days to years] Ü Lifespan [days to centuries] Ü Evolutionary clock [billions of years] Oscillators Ü Heartbeat [s] Ü Yeast respiration [40 min] Ü Circadian rhythms [20–30 h] Ü Estrous cycle [days] Ü Circannual mating rhythms [ 1 yr]
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psych106-7 - Sleep and Circadian Rhythms Azim Khan, MS PSYC...

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