Individual differences in the phase and amplitude of the human circadian temperature rhythm: with an emphasis on morningness-eveningness
Individual differences in the phase and amplitude of the human circadian temperature rhythm: with an emphasis on morningness-eveningness
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DOI：
10.1046/j.1365-2869.2000.00196.x
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发表时间：
2000-06-01
影响因子：
4.4
通讯作者：
Eastman, CI
中科院分区：
文献类型：
--
作者：
Baehr, EK;Revelle, W;Eastman, CI
我们研究了昼夜温度节律的相位和幅度之间的关系，使用问卷测量个性变量，与昼夜节律，年龄和性别相关的变量的个体差异。对101名男青年和71名女青年连续6天的动态核心体温进行了记录。温度最小值（T-min）和振幅（T-min）通过将复余弦曲线拟合到每个受试者每天的数据来推导。参与者完成了Horne-Ostberg Morningness-Eveningness Questionnaire（MEQ）、Circadian Type Inventory（CTI）和MMPI-2，并对Psychopathology-5（PSY-5）人格变量进行评分。结果表明，早晨型（M型）的平均Tmin为03.50 h，非早晨型（M型）为05.02 h，晚上型（E型）为06.01 h。给出的数字可以提供T-min的估计值，给出个体的早晨-晚上评分或周末清醒时间。T-min发生在大约8小时睡眠期的中间，但在T-min值较晚且夜间性增加的受试者中，T-min发生在更接近清醒的时间。换句话说，E型人比M型人在温度周期中睡得更早。温度和睡眠之间相位关系的这种差异可以解释为什么E型人在睡前更警觉，醒来后比M型人更困倦。男性的最小T出现时间比女性晚半小时。另一个有趣的发现包括昼夜节律温度相位和振幅之间的关联，即相位延迟越多的受试者振幅越大。较大的振幅是由于夜间温度较低。
We studied the relationship between the phase and the amplitude of the circadian temperature rhythm using questionnaires that measure individual differences in personality variables, variables that relate to circadian rhythms, age and sex. The ambulatory core body temperature of 101 young men and 71 young women was recorded continuously over 6 days. The temperature minimum (T-min) and amplitude (T-min) were derived by fitting a complex cosine curve to each day's data for each subject. Participants completed the Horne-Ostberg Morningness-Eveningness Questionnaire (MEQ), the Circadian Type Inventory (CTI) and the MMPI-2, scored for the Psychopathology-5 (PSY-5) personality variables. We found that the average T-min occurred at 03.50 h for morning-types (M-types), 05.02 h for the neither-types and 06.01 h for evening-types (E-types). Figures were presented that could provide an estimate of T-min given an individual's morningness-eveningness score or weekend wake time. The T-min occurred at approximately the middle of the 8-h sleep period, but it occurred closer to wake in subjects with later T-min values and increasing eveningness. In other words, E-types slept on an earlier part of their temperature cycle than M-types. This difference in the phase-relationship between temperature and sleep may explain why E-types are more alert at bedtime and sleepier after waking than M-types. The T-min occurred about a half-hour later for men than women. Another interesting finding included an association between circadian rhythm temperature phase and amplitude, in that subjects with more delayed phases had larger amplitudes. The greater amplitude was due to lower nocturnal temperature.