http://www.tc.gc.ca/innovation/tdc/p...59e/13959e.htm
يمكن إستنتاج قيم رياضية للأشكال أدناه ومن ثم تحديد أوزان الإيقاعات رقميا كما هي ممثلة بيانيا. والتمثيل البياني تمثيل رقمي أساسا
Biological Clock Timing
The most well known body rhythm is body temperature. Temperature is often used to illustrate a 24-hour biological rhythm. The body temperature’s high point is in the evening and the low point is in the early morning (around 05:00).
Various hormones also fluctuate with a 24-hour cycle (melatonin, cortisol, growth hormone – see
Figure 4).
Rhythms affect your performance, alertness, and sleep efficiency.
From Shifting to Wellness, Keyano College, 1995
Figure 4 – Example of Biological Rhythms
The Alertness and Sleepiness Rhythm
Your level of alertness and sleepiness determines how well you can sleep, how well you can perform, and whether you are alert and able to think clearly.
Figure 5 illustrates the 24-hour variation in sleepiness and alertness. Although individual rhythms vary slightly (morning or evening person), everyone has two distinct peaks and dips.
The greatest increase in sleepiness starts around your usual sleep time and peaks between 03:00 and 06:00. The second peak of sleepiness occurs approximately 12 hours later, between 14:00 to 16:00. Although taking naps is more common in countries with warm climates, midday heat is not the cause of afternoon sleepiness. Studies show the same two peak periods of sleepiness whether people live at the Equator or in North America. Afternoon sleepiness is often called the post-lunch dip, but it’s a myth that lunch is the cause. Studies have shown that people feel sleepy in the afternoon even if they have no lunch at all. Moreover, for most people, no similar increase in sleepiness is seen after breakfast or dinner. Peaks and dips in sleepiness depend on our internal biological rhythm, not on factors such as heat or meals.
Figure 5 – Sleepiness Over the 24-hour Cycle
In addition to these two peaks of sleepiness, studies have revealed two distinct zones of increased alertness. The first period occurs in the morning sometime after your usual wake time. The second occurs between 20:00 and 22:00, just a few hours before your usual bedtime.
Facts
Darkness tells your body clock to decrease alertness and get ready for sleep.
Sunlight in the morning tells your body clock to wake up and be alert.
Emergencies will temporarily increase your level of alertness and keep you awake.
Morning and Evening People
Individuals have different rhythms. Performance peaks at different times within a couple of hours (morning or evening person).
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