Biorhythm and Watch Rhythms: Hemeral Watch Rhythm and Anhemeral Watch Rhythm in Simulated Permanent Duty
The simulation of a 30-day submarine submersion with a volunteer crew of 24 men provided the framework for a comparison between two work/rest cycles within a crossover balanced design: a 72-hour period rhythm, as practiced in the Navy, with 4 hours of sleep shifting or sleep splitting in cyclic transposition for each third part of the crew; and a 24-hour period rhythm, with permanent 8 hours or 16 hours of sleep shifting for each third part of the crew.
The strong advantage of the second alternative compared to the first is evidenced in the sleep process, behavioral efficiency, mood, and circadian biochemical parameters.
KeywordsSlow Wave Normal Cycle Paradoxical Sleep Urinary Potassium Cortical Arousal
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