A new approximation, an alternative to the cosine function, was used to analyze body temperature throughout the day. The model studied is a two-term function characterized by three parameters that describe the temperature rise and fall. In contrast to other cyclic functions, this function can easily model complete cycles as well as segments of a cycle. This function has been applied to temperature series validating the dimension of morningness-eveningness throughout the day and also to studies that include body temperature, personality factors, and the dimension of morningness throughout a complete circadian period.
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References
1.
AlmirallH.AguirreA.RialR. V.DauratA.ForetJ.BenoitO. (1993) Temperature drop and sleep: Testing the contribution of SWS in keeping cool. NeuroReport, 5, 177–180.
2.
AlmirallH.MarcetC. (1995) Evolución de la temperatura corporal a lo largo del dia, función de crecimiento y cronotipo. Psicothema, 7, 317–326.
3.
BinghamC.ArbogasB.CornelissenG.LeeJ. K.HalbergF. (1982) Inferential statistical methods for estimating and comparing cosinor parameters. Chronobiologia, 9, 397–439.
4.
BlakeM. J. F. (1967) Relationship between arcadian rhythm of body temperature and intro-version-extroversion. Nature, 21, 896–897.
5.
BlakeM. J. F. (1971) Temperament and time of day. InColquhounW. P.(Ed.), Biological rhythms and human performance. New York: Academic Press. Pp. 109–148.
6.
BreithauptH.HildebrandtG.DohreD.JoschR.SieberU.WernerM. (1978) Tolerance to shift of sleep, as related to the individual's circadian phase position. Ergonomics, 21, 767–774.
7.
BrownE.CzeislerCh. (1992) The statistical analysis of circadian phase and amplitude in constant-routine core-temperature data. Journal of Biological Rhythms, 7, 177–202.
8.
ColquhounW. P.FolkardS. (1978) Personality differences in body-temperature rhythm and their relation to its adjustment to night work. Ergonomics, 21, 811–817.
9.
FolkardS.MonkT.LobbanM. (1979) Towards a predictive test of adjustment to shift work. Ergonomics, 22, 79–91.
10.
FrobergJ. (1977) Twenty-four-hour patterns in human performance, subjective and physiological variables and differences between morning and evening active subjects. Biological Psychology, 5, 119–134.
11.
HildebrandtG.StratmannI. (1979) Circadian system response to night work in relation to the individual circadian phase position. Occupational and Environmental Health, 43, 73–83.
12.
HorneJ. A.ÖstbergO. (1976) A self-assessment questionnaire to determine morningness-eveningness in human circadian rhythms. International Journal of Chronobiology, 4, 97–110.
13.
JohanssonB. W.KristianssonK-A.PapadopoulosK. I.SalfordL. G.SporrongB. (1992) Circadian variation of body temperature in man. InLomaxP.SchönbaumE.(Eds.), Thermoregulation: The pathophysiological basis of clinical disorders. Basel: Karger. Pp. 84–87.
14.
KerkhoffG. A. (1985) Inter-individual differences in the human circadian system: A review. Biological Psychology, 20, 83–112.
15.
LiuL-M.HudakG. B.BoxG. E. P.MullerM. E.TiaoG. C. (1985) The SCA statistical system. DeKalb, IL: Scientific Computing Association.
16.
LundR. (1974) Personality factors and desynchronization of circadian rhythms. Psychosomatic Medicine, 36, 224–228.
17.
MinorsD. S.WaterhouseJ. M. (1992) Investigating the endogenous component of human circadian rhythms: A review of some simple alternatives to constant routines. Chronobiology international, 9, 55–78.
18.
MinorsD. S.WaterhouseJ. M. (1993) Separating the endogenous and exogenous components of the circadian rhythm of body temperature during night work during some “purification” models. Ergonomics, 36, 497–507.
ÖstbergO.NichollA. G. M. (1973) The preferred thermal conditions for “morning” and “evening” types of subjects during day and night—preliminary results. Build International, 6, 147–157.
21.
ProdanM. I. (1968) Forest biometrics. London: Academic Press.
22.
RefinettiR. (1992) Analysis of the circadian rhythm of body temperature. Behavior Research Methods, Instruments and Computers, 24, 28–36.
23.
VidacekS.KaliternaL.Radosevic-VidacekB.FolkardS. (1988) Personality differences in the phase of circadian rhythms: A comparison of morningness and extraversion. Ergonomics, 31, 873–888.
24.
VitielloM. V.SmallwoodR. G.AveryD. H.PascuallyR. A.MartinD. C.PrinzP. N. (1986) Circadian temperature rhythms in young adult and aged men. Neurobiology of Aging, 7, 97–100.
