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  • Title: Effects of call on sleep and mood in internal medicine residents.
    Author: Rose M, Manser T, Ware JC.
    Journal: Behav Sleep Med; 2008; 6(2):75-88. PubMed ID: 18443947.
    Abstract:
    Residents on call experience decreased total sleep time (TST) and increased dysphoria. This study monitored changes in mood and sleepiness for 3 post-call days. Fifty-two internal medicine residents participated in the study. The residents wore actigraphs for the 4 to 9 days of the study. Each morning resident completed mood scales, a sleepiness scale, and estimated their prior night TST. The residents were on a 1-in-4 schedule. Call decreased subjective- and actigraphy-derived TST to less than 4 hr. During the 3 days post call, mood measures improved. Tension, depression, and anxiety stabilized on the first post-call day following the first night of off-call sleep during which the residents obtained about 7 hr of sleep. Vigor, fatigue, and confusion stabilized on the second post-call day. The Epworth Sleepiness Scale dropped to less than 11 after 1 post-call night and continued to decrease up to 3 post-call days. The effects of call linger past the first recovery night. For these residents, recovery sleep appeared inadequate, and the negative effects of call persisted across succeeding off-call days. Thus, for these residents on a 1-in-4 schedule, call affects their mood for much of the time when off call and potentially their personal and professional interactions during this period as well.
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