A study comparing actigraphy and polysomnography in the detection of leg movements was performed in a group of 35 patients with sleep disorders. Visual scoring used epochs of 5-second duration, and in each epoch, electromyographic activity of tibialis anterior muscle was classified in eight types on the basis of its duration and amplitude. Activity levels of the actigraphic data were logged in 5-second intervals and stored in memory for computer retrieval. To assess the reproducibility of actigraphic detection scoring, in 10 patients actigraphic and polysomnographic data were compared during two consecutive nights. Despite a high correlation between polysomnography and actigraphy in the detection of muscular activity (r = 0.78; P = 0.001), no agreement was obtained between the two analyses according to the Bland and Altman method of concordance (mean bias-117.5). The greater agreement was found for electromyographic activity lasting more than 3 seconds and with an amplitude of more than 50 microV. In the group of patients examined during two consecutive nights the scoring error did not differ significantly. The results demonstrated that (1) despite a significant correlation between actigraphic and polysomnographic data, actigraphy substantially underestimated leg electromyographic activity and therefore could not be used routinely for diagnostic purposes; and (2) because error scoring did not undergo significant changes across the two nights, actigraphy may be used for follow-up evaluation.

译文

在一组35名睡眠障碍患者中进行了一项比较运动描记术和多导睡眠描记术检测腿部运动的研究。视觉评分使用5秒持续时间的时间,并且在每个时期,根据其持续时间和幅度将胫骨前肌的肌电图活动分为八种类型。活动数据的活动级别以5秒的间隔记录,并存储在内存中用于计算机检索。为了评估活动检测评分的可重复性,在连续两个晚上比较了10名患者的活动和多睡眠图数据。尽管多导睡眠图和肌动图在肌肉活动检测中具有高度相关性 (r = 0.78; P = 0.001),但根据Bland和Altman一致性方法 (平均偏倚-117.5),两种分析之间没有达成一致。发现肌电图活动持续3秒以上且振幅超过50微伏的一致性更大。在连续两个晚上检查的患者组中,评分错误没有显着差异。结果表明 :( 1) 尽管活动和多导睡眠图数据之间存在显着相关性,但活动图大大低估了腿部肌电活动,因此不能常规用于诊断目的; (2) 由于错误评分在两晚中没有发生重大变化,actigraphy可用于后续评估。

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