Faculty of Psychology, University of Warsaw, Poland.
Eur J Pain. 2013 Aug;17(7):1068-73. doi: 10.1002/j.1532-2149.2012.00274.x. Epub 2013 Jan 16.
Diurnal variations in pain have been observed in experimental protocols, post-surgery states and pathological conditions. Chronotype is considered to have the most profound effect on diurnal variations, and in addition, previous studies suggest that evening types may be more vulnerable to pain than morning types. This study aimed to examine whether or not morning and evening chronotypes differ in terms of their daily levels and diurnal fluctuations of pain sensitivity.
A total of 16 morning-healthy and 15 evening-healthy men were selected using the Morningness-Eveningness Questionnaire and underwent nine measurements during 1 day (between 08:15 and 20:15 h), each consisting of five heat stimuli situated at the ventral side of the wrist.
A marked difference between chronotypes was found, with morning types showing less sensitivity to pain than evening types all day long [M = 50.1; standard error (SE) = 1 and M = 47.2; SE = 1, respectively; pain thresholds in centigrade]. Diurnal variations in pain were not statistically significant.
The results showed that chronotype could be an important factor determining sensitivity to pain, regardless of time of day.
在实验方案、手术后状态和病理条件下，已经观察到疼痛的昼夜变化。时型被认为对昼夜变化的影响最大，此外，先前的研究表明，晚型可能比早型更容易感到疼痛。本研究旨在探讨晨型和晚型在疼痛敏感性的日常水平和昼夜波动方面是否存在差异。
使用 Morningness-Eveningness Questionnaire 选择了 16 名晨型健康男性和 15 名晚型健康男性，并在 1 天内进行了 9 次测量（在 08:15 至 20:15 之间），每次测量由位于手腕腹侧的 5 个热刺激组成。
发现时型之间存在明显差异，晨型全天的疼痛敏感性低于晚型[M=50.1；标准误差（SE）=1 和 M=47.2；SE=1，分别；疼痛阈值以摄氏度为单位]。疼痛的昼夜变化没有统计学意义。
结果表明，无论一天中的时间如何，时型可能是决定疼痛敏感性的一个重要因素。
