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The Effects of the Mars Exploration Rovers (MER) Work Schedule Regime on Locomotor Activity Circadian Rhythms, Sleep and FatigueThis study assessed human adaptation to a Mars sol by evaluating sleep metrics obtained by actigraphy and subjective responses in 22 participants, and circadian rhythmicity in locomotor activity in 9 participants assigned to Mars Exploration Rover (MER) operational work schedules (24.65 hour days) at the Jet Propulsion Laboratory in 2004. During MER operations, increased work shift durations and reduced sleep durations and time in bed were associated with the appearance of pronounced 12-hr (circasemidian) rhythms with reduced activity levels. Sleep duration, workload, and circadian rhythm stability have important implications for adaptability and maintenance of operational performance not only of MER operations personnel but also in space crews exposed to a Mars sol of 24.65 hours during future Mars missions.
Document ID
Document Type
Technical Memorandum (TM)
DeRoshia, Charles W.
(NASA Ames Research Center Moffett Field, CA, United States)
Colletti, Laura C.
(QSS Group, Inc. Moffett Field, CA, United States)
Mallis, Melissa M.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 25, 2013
Publication Date
December 1, 2008
Subject Category
Astronautics (General)
Report/Patent Number
Funding Number(s)
WBS: WBS 711-70-02
Distribution Limits
Public Use Permitted.
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