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     * [33]Biorhythms Index
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Biorhythms


   [35]View Asthma Slideshow
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   Medical Author: [39]William C. Shiel, Jr., MD, FACP, FACR
   Medical Editor: [40]Melissa Conrad Stöppler, MD
     * [41]What are biologic rhythms?
     * [42]How does the "body clock" affects symptoms of illness?
     * [43]What are examples of specific diseases affected by biorhythms?
     * [44]Angina
     * [45]Heart attack
     * [46]High blood pressure (hypertension)
     * [47]Hay fever (allergic rhinitis)
     * [48]Asthma
     * [49]Can the "body clock"  affect diagnostic testing?
     * [50]Can drug therapy be matched to the "body clock?"
     * [51]Chronobiology: marking time, making progress

What are biologic rhythms?

   What are biologic rhythms? In essence, they're the rhythms of life. All
   forms of life on earth, including our bodies, respond rhythmically to
   the regular cycles of the sun, moon, and seasons.

   For example, as night turns into day, vital body functions, including
   heart rate and [52]blood pressure, speed up in anticipation of
   increased physical activity. These and other predictable fluctuations
   in body function, taking place during specific time cycles, are our
   biologic rhythms. They are regulated by "biologic clock" mechanisms
   located in the brain.

   Although biologic rhythms can be "reprogrammed" by environmental
   influences (such as when a person regularly works the night shift and
   sleeps during the day), they are genetically "hard-wired" into our
   cells, tissues, and organs.

   Medical chronobiologists have found that biologic rhythms can affect
   the severity of disease symptoms, diagnostic test results, and even the
   body's response to drug therapy. Now these investigators are working to
   discover how the rhythms of life can be used to improve the practice of
   medicine - and your health.

   These time-related medical observations, and others still in the
   exciting process of discovery, are rooted in chronobiology (chronos -
   time; bios - life; logos - science), the study of biologic rhythms.

How does the "body clock" affects symptoms of illness?

   Among the various biologic rhythm cycles that medical chronobiologists
   study, the 24-hour day/night-activity/rest cycle is considered a key
   chronobiologic factor in medical [53]diagnosis and treatment. Formally
   known as the [54]circadian rhythm, it's also referred to as the "body
   clock."

   Why is the 24-hour body clock so important?

   Because so many of our normal body functions follow daily patterns of
   speeding up and slowing down, intensifying and diminishing, in
   alignment with circadian rhythm. Interestingly, so do the symptoms of a
   number of [55]chronic disorders:

   Allergic rhinitis: (nasal inflammation associated with hay fever)
   Symptoms of sneezing, [56]runny nose, and stuffy nose are typically
   worse in the early waking hours than later during the day.

   Asthma: In most patients, symptoms are more than 100 times as likely to
   occur in the few hours prior to awakening than during the day.

   Stable angina: [57]Chest pain and [58]electrocardiographic (ECG, EKG)
   abnormalities are most common during the first 4 to 6 hours after
   awakening.

   [59]Prinzmetal's angina: ECG abnormalities are most common during
   [60]sleep; chest pain can occur even while at rest.

   Heart attack: Heart attack most commonly occurs in the early waking
   hours.

   Stroke: [61]Strokes most commonly occur in the early waking hours.

   Hypertension: The highest blood pressure readings typically occur from
   late morning to middle afternoon; lowest occur during early sleep.
   Therapy now exists that works with your body clock; consult your
   physician about this treatment. Clinical studies are underway to
   further this research.

   [62]Rheumatoid arthritis: RA symptoms are most intense upon awakening.

   [63]Osteoarthritis: Symptoms of osteoarthritis worsen in the afternoon
   and evening.

   Ulcer disease: The pain typically occurs after stomach emptying,
   following daytime meals, and in the very early morning, disrupting
   sleep.

   [64]Epilepsy: Seizures often occur only at particular times of the day
   or night; individual patterns differ among patients.
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     * [73]Biorhythms Index
     * [74]Glossary

   Next: [75]What are examples of specific diseases affected by
   biorhythms? »
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Biorhythms

   [96]Jet Lag »

What is jet lag?

   Jet lag, also called desynchronosis, is a temporary disorder that
   causes fatigue, insomnia, and other symptoms as a result of air travel
   across time zones.

What are other symptoms of jet lag?

   Besides fatigue and insomnia, a jet lag sufferer may experience
   anxiety, constipation, diarrhea, confusion, dehydration, headache,
   irritability, nausea, sweating, coordination problems, and even memory
   loss. Some individuals report additional symptoms, such as heartbeat
   irregularities and increased susceptibility to illness.

What is a time zone?

   A time zone is a geographical region which has the same time everywhere
   within it. The world has 24 time zones, one for each hour in the day.
   Each zone runs from north to south in strips that are approximately
   1,000 miles (1,600 kilometers) wide. (The actual width of each zone
   varies to accommodate political and geographical boundaries.) As...

   [97]Read the Jet Lag article »
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     * [112]Complete List »

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   Liens cachés :
 169. http://www.webmd.com/mobile