Circadian rhythm experiment. Male patient asleep in a sleep research laboratory,during a circadian rhythm experiment. Electrodes are attached to his head to measure brainwaves (EEG),eye and facial movements. Heart rate (ECG) is monitored and blood is sampled for hormone analysis. The patient is cut off from all references to the time of day. In this way,his circadian rhythm,an internal biological clock which controls awake and sleep periods,is being "timed" or "phased". This clock also controls daily changes in body temperature and hormone secretion. Photographed at the Laboratory for Circadian and Sleep Disorder Medicine,USA | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Morgan, Hank |
Bildgröße: | 5011 px × 3319 px |
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