M3-BIORES, KULeuven, Kasteelpark Arenberg 30, bus 2456, 3001 Heverlee, Belgium.
Eur J Appl Physiol. 2010 May;109(2):317-22. doi: 10.1007/s00421-010-1359-0. Epub 2010 Jan 23.
Sleep fragmentation is a cause of impaired daytime performance. We have developed an algorithm for detection of nighttime awakenings based on heart rate. As much as 15 healthy normal sleepers, 23 +/- 3 years, participated in this study. The dataset contains 33 nights of polysomnographic (PSG) and electrocardiographic (ECG) measurements. After a habituation night, the subjects underwent a reference night without interventions, followed by some nights with interventions. These included noise, light, physical and cognitive interventions. Nighttime awakenings were subdivided in to awakenings (>15 s) and short awakenings (<15 s). The overall number of awakenings was 18.5 (+/-10.5) and short awakenings 13.2 (+/-10.5). The number of nighttime awakenings did not differ significantly between the reference and intervention nights; a repeated measures ANOVA resulted in a p value of 0.66 for awakenings and 0.57 for short awakenings. As much as 5 reference nights were used as training set, 28 as validation set. The algorithm detects the awakening periods with a sensitivity of 80.5% (confidence interval 77.9-82.9%). Heart rate is an adequate measure that allows for detection of nighttime awakenings and hence sleep quality.
睡眠碎片化是导致白天表现受损的一个原因。我们已经开发出一种基于心率的夜间觉醒检测算法。多达 15 名健康正常的睡眠者（年龄 23 +/- 3 岁）参与了这项研究。该数据集包含 33 晚的多导睡眠图（PSG）和心电图（ECG）测量数据。在适应夜间后，受试者进行了无干预的参考夜间，随后进行了一些干预夜间。这些干预包括噪声、光照、身体和认知干预。夜间觉醒被细分为觉醒（>15 秒）和短暂觉醒（<15 秒）。总觉醒次数为 18.5（+/-10.5），短暂觉醒次数为 13.2（+/-10.5）。参考夜间和干预夜间的觉醒次数没有显著差异；重复测量方差分析得出的觉醒 p 值为 0.66，短暂觉醒 p 值为 0.57。多达 5 个参考夜间被用作训练集，28 个作为验证集。该算法检测到的觉醒期的灵敏度为 80.5%（置信区间为 77.9-82.9%）。心率是一种合适的测量方法，可以检测夜间觉醒和睡眠质量。
