van Hilten J J, Braat E A, van der Velde E A, Middelkoop H A, Kerkhof G A, Kamphuisen H A
Department of Neurology, Academic Hospital, Leiden, The Netherlands.
Sleep. 1993 Feb;16(2):146-50. doi: 10.1093/sleep/16.2.146.
The aim of this study was to assess the internight and intrasubject variability of nocturnal activity and immobility measures of 99 healthy subjects aged 50-98 years. Motor activity was recorded at home during 6 successive nights with a wrist-worn activity monitor. The occurrence of suprathreshold motor activity was recorded over 15-second epochs. For each subject, six mean measures reflecting activity or immobility during sleep and their coefficient of variation were calculated. Our results revealed no first-night effect or day-of-week effect of the activity and immobility measures over the 6 nights across all subjects. On the other hand, for all nocturnal activity and immobility measures, a considerable intrasubject variability across the 6 nights was found. Females had a greater intrasubject variability of the mean duration of immobility periods and the movement index than males. The intrasubject variability of all nocturnal activity and immobility measures across the successive age groups remains stable. These findings emphasize that although a first-night effect may be lacking, the intrasubject variability of activity and immobility measures across several nights may still be considerable.
本研究的目的是评估99名年龄在50至98岁之间的健康受试者夜间活动及静止状态指标的夜间内和个体内变异性。使用腕部活动监测仪在连续6个晚上在家中记录运动活动。在15秒的时间段内记录阈上运动活动的发生情况。为每个受试者计算反映睡眠期间活动或静止状态的六个平均指标及其变异系数。我们的结果显示，在所有受试者的6个晚上中，活动和静止状态指标不存在首夜效应或星期效应。另一方面，对于所有夜间活动和静止状态指标，在6个晚上中发现了相当大的个体内变异性。女性在静止期平均持续时间和运动指数方面的个体内变异性比男性更大。在连续的年龄组中，所有夜间活动和静止状态指标的个体内变异性保持稳定。这些发现强调，尽管可能不存在首夜效应，但在几个晚上中活动和静止状态指标的个体内变异性仍可能相当大。
