![]() ![]() Community-dwelling men aged 65 and older were recruited to participate in the MrOS study at 6 US clinical centers in Birmingham, AL Minneapolis, MN Palo Alto, CA the Monongahela Valley near Pittsburgh, PA Portland, OR and San Diego, CA. The MrOS Sleep Study recruited 3135 men between December 2003 and March 2005 from a larger study of 5994 men, the Osteoporotic Fractures in Men (MrOS) Study. The study was large enough to examine whether differences in estimation of the outcome of TST from PSG and the preferred mode of actigraphy are significantly associated to the presence of sleep problems, comorbidities, demographic or anthropometric factors. The Outcomes of Sleep Disorders in Men (MrOS Sleep) Study provides a unique opportunity among a large population of community-dwelling older men to investigate whether TST, SE, SOL, and WASO measured using the actigraph model Sleepwatch-O (Ambulatory Monitoring, Inc, Ardsley, NY) were comparable to similar assessments using PSG, and to determine which of 3 different modes of data collection from this actigraph model were optimal for assessment of sleep in older men. 3, 7 These studies found that while actigraphy does reasonably well estimating sleep from wake, there is less accuracy in subsets such as those with sleep disordered breathing or poor sleep quality. A few studies have examined the relationship of misclassification among subgroups within a population. 4, 11 – 16 However, both small and/or homogeneous samples prevent the examination of the association of factors related to misclassification of sleep and wake from actigraphy. Many studies examined homogeneous samples consisting of those with sleep disordered breathing, 5, 6 insomnia, 9, 11 – 14 depression, 15 or healthy volunteers. A number of sleep related characteristics had a significant impact on the accuracy of actigraphy for measurement of total sleep time, and should be considered when using actigraphy among populations with sleep disorders.īecause actigraphy is often used to characterize sleep patterns in subgroups with different underlying pathologies, it is important to understand whether systematic misclassification of coding wake as sleep and vice versa influences the quantification of sleep patterns. Study Impact: The PIM mode of actigraphy performed reasonably well, and is preferred in older community-dwelling men. Potential causes of the difference between the 2 devices were examined. ![]() To our knowledge there have been no studies comparing sleep measurements from actigraphy to PSG in older community-dwelling men.Ĭurrent Knowledge/Study Rationale: This study was performed to examine whether total sleep time, sleep fragmentation, and sleep latency measured with wrist actigraphy were comparable to similar assessments using the gold-standard of PSG, and to determine which of 3 modes of data collection from this actigraph model were best. 3, 7 Because of these issues it is preferred to validate actigraphic sleep-wake estimation within specific populations for specific actigraphic devices. For example, one study of elderly women and one study of adolescents that both used the same actigraph model and scoring algorithms found differing optimal modes of data collection when compared to PSG. 1 There can also be differences in the accuracy of actigraphy for estimation of sleep among differing populations. 3 – 10 As noted by Ancoli-Israel and colleagues, different actigraphic devices may have different measurement of activity level and sleep-wake scoring algorithms, which make direct comparison of devices difficult. There have been numerous studies showing good concordance for sleep-wake estimation between actigraphy and PSG. Typical parameters gathered by both PSG and actigraphy are total sleep time (TST), sleep efficiency (SE), sleep onset latency (SOL), and wake after sleep onset (WASO). Use of actigraphy has the benefit over PSG of being less costly and invasive, and sleep can be monitored continuously for long periods of time. These data are then used to infer sleep from wake using validated algorithms. 1, 2 Actigraphy is a noninvasive, objective method for gathering data on movement via an accelerometer. The use of wrist actigraphy has become more common in past years as an alternative to PSG for sleep-wake assessment. The measurement of sleep in humans has been typically performed using polysomnography (PSG), the “gold standard” for sleep-wake assessment.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |