The human body has daily rhythms that seem to be governed by what scientists now regard as a “biological clock.” Heart rate, respiration rate, blood pressure, body temperature, and urine excretion all have varying levels (peaks during the day and troughs that occur at night). Such functions are also known as “circadian rhythms.”
Although environmental clues sometimes influence these rhythms, such as the light and dark cycles, many rhythms persist when environmental clues are removed.
In experiments designed to understand the workings of the body’s inner clocks, people were observed as they lived for weeks with neither social nor geophysical cues, such as set meal times and light-dark cycles. The basic rhythms continued.
The most well-known circadian rhythm is that of body temperature, which varies daily only a degree or two in a healthy person, peaking in late afternoon and dropping during early morning hours.
The temperature rhythm persists when the individual does not follow daily routine, such as periods when one is confined to bed for 24 hours, or when meal time is varied, or when no food is eaten during fast...
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