Performance on different turns of duty within a three-shift system and its relation to body temperature — two field studies
Much research has been done on the circadian variation in body temperature and performance efficiency, and on the relationship between these two variables in a normal sleep-waking routine (Kleitman 1963; Blake 1967; Colquhoun, Blake and Edwards 1968; Colquhoun 1971). The pattern of variation in an abnormal routine has also been studied (Van Loon 1963; Bjerner, Holm and Swens-son 1955; Högger 1958). These studies include both field as well as laboratory investigations, but the relationship between body temperature and performance efficiency in an abnormal routine has only been studied in laboratory experiments (Kleitman and Jackson 1950; Alluisi and Chiles 1967).
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