In clinical practice, automated analysis is generally used to this end. Sleep-related data are then calculated, and an actogram generated with visualization of the day–night rhythm (see Fig. This makes it possible to significantly improve the actigraphy report. Thus, the actigraphy system is able to record the length of sleep, which is needed later to calculate the actigraphy variables (see Table 2 ).Īfter downloading the actigraphy data, manual data cleansing should be performed. Nighttime sleep interruptions, such as visits to the toilet, are not marked by patients. The use of actigraphy event markers as soon as a sleep attempt begins (eye closure, corresponding to actigraphy light-out) and ends (opening eyes in the morning, getting out of bed, corresponding to actigraphy light-on) has proven successful.Īt the same time, sleep opportunity, which is often spent on other activities (e.g., watching TV, reading, eating) can be distinguished from actual sleep attempts. This can be used when discussing findings with the patient, in order to reconstruct everyday situations together with the patient and correlate these with the recorded actigraphy. The ideally waterproof devices are worn on the non-dominant hand for 24 h.Īdditional information such as subjective total sleep time and quality can be recorded in a sleep diary. Wrist actigraphy usually measures day–night rhythms in daily life over 1–4 weeks. The fact that there are as yet no standardized scoring recommendations negatively affects the objectivity of scoring and inter-rater reliability. As a general rule, the epochs used in actigraphy devices can be freely selected in sleep medicine practice, they are usually 30 or 60 s.įor adaptation of the scoring algorithms, empirical values or laboratory standards are used. The recorded data are usually processed in a frequency range of 0.25–3 Hz with band-pass filters before they are saved. Newer actigraphs record motion in up to three axes.
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