“Ambulatory monitoring of sleep disorders". Russo et al 2010. Practice parameters of the American Academy of sleep medicine
Audience will get to know actigraphy Technique Uses What does it record Pros &Cons Practice parameters
Application of accelerometers using miniature motion sensors to study the macro and micro activities associated with human motion has been termed actigraphy.
How is it worn Where What does it record Where does the data go.
It is used to clinically evaluate: Insomnia Circadian rhythm sleep disorders Excessive sleepiness Restless leg syndrome
Since its conception in 1920s, actigraphy was developed to objectively measure and quantify sleep patterns based on body movements.
wrist-mounted accelerometry was developed in the 1970s and 1980s at the Walter Reed Army Institute of Research (AIR) and the National Institutes of Health (NIH
Sadeh and colleagues concluded that actigraphy provided useful information and that it may be a "cost-effective method for assessing specific sleep disorders but methodological issues have not been systematically addressed in clinical research and practice".
Fastest sample rate Amount of memory Battery usage Weight: Water resistance: User input: Subjective user input
Valid for assessing sleep durations and sleep/wake activity Utility in adult and, adolescent, geriatric patients Observations studies in comparison to actigraphy yielded a high reliability In comparison with PSG, a technical difficulty Less reliable than PSG for detecting sleep as sleep became more disturbed Less reliable for measuring sleep offset or sleep efficiency
Compared to traditional PSG, actigraphy records for multiple days and nights Actigraphy facilitate sleep assessment at home Artifacts,recording standardized?? Sensitivity to differentiate between sleep and movementless moments Underestimate leg EMG activity
o actigraphy can be a useful follow-up mean to intervention studies. o Valid marker of entrained endogenous circadian phase o Ability to detect Periodic leg movements (PLMs) o Utility for assessment during extended clinical trials o In comparison to PSG, it lacks sensitivity to detect sleep quality and sleep stages, specifically cannot delineate arousals o There exist discrepancies in data on sleep latency, number and duration of night awakenings or number of naps when compared to sleep log analysis
1.A number of scoring programs have been developed, with different algorithms for discriminating sleep from. 2.Some of these algorithms have been validated against polysomnographic 3.The number of scoring programs and the number of variables continues to increase, resulting in the proliferation of variables that have no demonstrable validity or reliability yet are automatically generated when the scoring program is run.