Further validation of actigraphy for sleep studies
Further validation of actigraphy for sleep studies
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DOI：
10.1093/sleep/26.1.81
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发表时间：
2003-02-01
期刊：
影响因子：
5.6
通讯作者：
Calil, HM
中科院分区：
文献类型：
--
作者：
de Souza, L;Benedito-Silva, AA;Calil, HM
研究目标：体动记录仪通常与多导睡眠图 (PSG) 进行比较，后者被认为是睡眠研究的黄金标准。本研究的目的是评估 PSG 与之前提出的两种算法（Cole 等人，1992 年；Sadeh 等人，1994 年）之间的一致性，以分析活动记录。通过计算敏感性、特异性和准确性来评估每分钟的一致率。关于睡眠参数，通过 Bland 和 Altman 技术进行一致性。设计：适应睡眠实验室的一晚，然后整晚同时进行多导睡眠图和活动记录仪记录。参与者：21 名健康志愿者。设置：睡眠实验室。干预：无。结果：两种算法正确识别了所有 PSG 时期的 91％，并且这种准确性相当令人满意。体动记录仪是一种灵敏的方法，Cole 算法和 Sadeh 算法的灵敏度分别为 99% 和 97%。然而，体动记录仪的特异性较低：Cole 和 Sadeh 的算法分别为 34% 和 44%。 Bland 和 Altman 技术表明，体动记录仪系统性地高估了睡眠潜伏期、总睡眠时间和睡眠效率，而低估了间歇性觉醒。 结论：本研究的结果表明，体动记录仪作为一种有用的睡眠评估方法的实用性，尽管它在识别睡眠期间的清醒时期方面存在局限性。布兰德和奥特曼一致性技术被证明是评估体动记录仪与多导睡眠图的一致性程度的强大工具。该技术与敏感性和特异性的计算相结合，似乎是评估一致性的最适当的程序。
Study Objectives: Actigraphy is generally compared to polysomnography (PSG), which has been considered the gold standard for sleep studies. The objective of the present study was to evaluate the concordance between PSG and two previously proposed algorithms (Cole et al, 1992; Sadeh et al, 1994) to analyze actigraphic recordings. The minute-by-minute agreement rate was evaluated through calculation of sensitivity, specificity, and accuracy. Regarding the sleep parameters, the concordance was performed through the Bland and Altman technique.Design: A night of adaptation to the sleep laboratory followed by simultaneous polysomnographic and actigraphic recordings throughout the night.Participants: 21 healthy volunteers.Setting: A sleep laboratory.Interventions: None.Results: Ninety-one percent of all PSG epochs were correctly identified by both algorithms, and this accuracy is reasonably satisfactory. The actigraphy was a sensitive method, with values of 99% and 97% for Cole's and Sadeh's algorithms, respectively. However, actigraphy had a low specificity: 34% and 44% for Cole's and Sadeh's algorithms, respectively. The Bland and Altman technique showed that actigraphy systematically overestimated Sleep Latency, Total Sleep Time and Sleep Efficiency while it underestimated Intermittent Awakenings.Conclusions: The results of this study show the utility of actigraphy as a useful method for assessment of sleep, despite its limitations regarding identification of waking epochs during sleep. The Bland and Altman concordance technique was revealed to be a powerful tool to evaluate how well actigraphy agreed with polysomnography. This technique, combined with calculations of sensitivity and specificity, appears to be the most adequate procedure for the assessment of concordance.