Akerstedt T, Fröberg J E
Biol Psychol. 1976 Dec;4(4):277-92. doi: 10.1016/0301-0511(76)90019-3.
Interindividual differences in circadian rhythms of urinary catecholamine excretion, performance, self-ratings of arousal and oral temperature were studied in 80 subjects divided into three groups--morning-active, evening-active, and intermediate. Catecholamine excretion, body temperature, and self-ratings of arousal exhibited pronounced circadian variations. Morning-active subjects exceeded other groups in the 24 h level of adrenaline excretion but crest phases did not differ, occurring close to 13.00 h. No differences between groups were found for noradrenaline excretion. Crest phases occurred close to noon. Self-rated alertness exhibited a significantly earlier (14.12 h) crest phase for morning-active than for evening-active subjects (16.09 h). The performance did not differ between groups.
在80名受试者中研究了尿儿茶酚胺排泄、表现、自我觉醒评分和口腔温度的昼夜节律的个体间差异，这些受试者被分为三组——晨型、夜型和中间型。儿茶酚胺排泄、体温和自我觉醒评分呈现出明显的昼夜变化。晨型受试者在24小时肾上腺素排泄水平上超过其他组，但峰值阶段没有差异，都接近13:00。去甲肾上腺素排泄在组间没有差异。峰值阶段接近中午。自我评定的警觉性方面，晨型受试者的峰值阶段（14:12）比夜型受试者（16:09）明显更早。各组之间的表现没有差异。
