Evaluation of immobility time for sleep latency in actigraphy

Chae, Kyu Young; Kripke, Daniel F.; Poceta, J. Steven; Shadan, Farhad F.; Jamil, Shazia; Cronin, John; Kline, Lawrence E.

doi:10.1016/j.sleep.2008.07.009

Cited by 86 publications

(66 citation statements)

References 11 publications

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“…1 Estimation of SOL by the Actiwatch2 was not valid in our study; 13 subjects had a value of zero for SOL at all three settings after editing for lights out based on the PSG. Similar to previous reports, 24 SOL in the current study did not differ between the sensitivity thresholds. This was because sleep onset was determined using the criterion of immobility, defined as less than 2 activity counts per 30 seconds for 10 consecutive minutes; a criterion not affected by the sensitivity thresholds for wakefulness detection.…”

Section: Differences In Sleep Parameter Agreement By Threshold Settingsupporting

confidence: 93%

Validity of Actigraphy in Measurement of Sleep in Young Adults With Type 1 Diabetes

Farabi

Quinn

Carley

2017

Journal of Clinical Sleep Medicine

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Study Objectives: Accurate objective measurement of sleep, an important health behavior, is needed. Individuals with type 1 diabetes mellitus (T1DM) have altered sleep architecture and reduced sleep quality in comparison with healthy controls. The aim of this investigation was to compare a commonly used actigraphy device, Actiwatch2, with polysomnography (PSG)-based measures of sleep in young adults with T1DM, and to determine which Actiwatch2 threshold setting provides the best correspondence. Methods: Subjects age 18-30 years with T1DM wore the Actiwatch2 while simultaneously undergoing in-laboratory PSG. Sleep parameters were derived from the Actiwatch2 using the three different sensitivity thresholds (low, medium, and high) provided by the manufacturer and compared with sleep parameters from PSG. Statistical analysis included intraclass correlation coefficients and Bland-Altman plots for comparison of sleep parameters. Cohen kappa and the prevalence-adjusted and bias-adjusted kappa (PABAK) were calculated to determine agreement between epoch-by-epoch sleep and wake data measured by the PSG versus Actiwatch2. Results: Twenty-seven subjects were included in the analysis. The low threshold setting provided the greatest agreement and least bias in comparison with PSG for sleep parameters (intraclass correlation coefficient range 0.38 to 0.77). Mean differences between the low setting and PSG were nonsignificant (P > .65) for all sleep parameters except sleep onset latency (P = .04). All three settings provided approximately equivalent and moderate epoch-by-epoch agreement with the PSG (PABAK coefficients ranging from 0.56 to 0.63). Conclusions: When measuring sleep with the Actiwatch2 in young adults with T1DM, the low threshold setting provides the most accurate estimates of sleep parameters in comparison with PSG.

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Section: Differences In Sleep Parameter Agreement By Threshold Settingsupporting

confidence: 93%

Validity of Actigraphy in Measurement of Sleep in Young Adults With Type 1 Diabetes

Farabi

Quinn

Carley

2017

Journal of Clinical Sleep Medicine

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“…Sadeh and Acebo, 2002;Ancoli-Isreal et al 2003;Hurelbrink et al, 2005;Chae et al, 2009;Sadeh, 2011), but to date has not been validated in other species.…”

Section: Seasonal Changes In the Timing Of Sleepmentioning

confidence: 99%

Arabian Oryx (Oryx leucoryx) Respond to Increased Ambient Temperatures with a Seasonal Shift in the Timing of Their Daily Inactivity Patterns

et al. 2016

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The Arabian oryx inhabits an environment where summer ambient temperatures can exceed 40°C for extended periods of time. While the oryx employs a suite of adaptations that aid survival, the effects of this extreme environment on inactivity/sleep, where ambient temperatures often exceed mammalian thermoneutral zones, are unknown.To determine how the oryx manages inactivity/sleep seasonally we used fine and coarsegrain actigraphy, in 16 animals, to reveal when the animals were inactive/sleeping in relation to variations in ambient temperatures and light levels. We demonstrate that during the cooler winter months the oryx is inactive/sleeping during the cooler parts of day (pre-dawn hours), showing a diurnal activity pattern. In contrast, in the summer months, the oryx displayed a crepuscular activity pattern, with the major inactivity/sleep bouts occurring equally during both the coolest part of the night (pre-dawn hours) and the hottest part of the day (afternoon hours). Interestingly, the daily rhythm of the timing of changes in core body temperature did not vary seasonally, although the amplitude did change. The transition from winter diurnal activity to summer crepuscular activity occurred in May, while the reverse occurred in September. By having half of the major summer sleep bouts during the hottest part of the day, the oryx may take advantage of the thermoregulatory physiology of sleep to mitigate increases in body temperature. The seasonal summer desynchronization of circadian entrained daily rhythms (core body temperature and daily activity patterns) is suggestive of temperature acting to mask, or modify, output pathways from the suprachiasmatic nucleus.

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“…Research has shown that only if SE% is below 80%, health is negatively impacted (Dew et al 2003). Regarding SL, some previous studies have criticized the scoring of SL with actigraphy as actigraph algorithms tend to overscore sleep periods for sleep latencies (Chae et al 2009;Lichstein et al 2006). Thus, actigraphy might not provide accurate estimates of SL and explain the non-significant findings of SL between the investigated offshore periods.…”

Section: Discussionmentioning

confidence: 99%

Examining courses of sleep quality and sleepiness in full 2 weeks on/2 weeks off offshore day shift rotations

Riethmeister

Bültmann

Boer

et al. 2018

Chronobiology International

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To better understand sleep quality and sleepiness problems offshore, we examined courses of sleep quality and sleepiness in full 2-weeks on/2-weeks off offshore day shift rotations by comparing pre-offshore (1 week), offshore (2 weeks) and post-offshore (1 week) work periods. A longitudinal observational study was conducted among N=42 offshore workers. Sleep quality was measured subjectively with two daily questions and objectively with actigraphy, measuring: time in bed (TIB), total sleep time (TST), sleep latency (SL) and sleep efficiency percentage (SE%). Sleepiness was measured twice a day (morning and evening) with the Karolinska Sleepiness Scale. Changes in sleep and sleepiness parameters during the pre/post and offshore work periods were investigated using (generalized) linear mixed models. In the pre-offshore work period, courses of SE% significantly decreased (p=.038). During offshore work periods, the courses of evening sleepiness scores significantly increased (p<.001) and significantly decreased during post-offshore work periods (p=.004). During offshore work periods, TIB (p<.001) and TST (p<.001) were significantly shorter, SE% was significantly higher (p=.002), perceived sleep quality was significantly lower (p<.001) and level of rest after wake was significantly worse (p<.001) than during the preand post-offshore work periods. Morning sleepiness was significantly higher during offshore work periods (p=.015) and evening sleepiness was significantly higher in the post-offshore work period (p=.005) compared to the other periods. No significant changes in SL were observed. Courses of sleep quality and sleepiness parameters significantly changed during full 2-weeks on/2-weeks off offshore day shift rotation periods. These changes should be considered in offshore fatigue risk management programmes. ARTICLE HISTORY

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Evaluation of immobility time for sleep latency in actigraphy

Cited by 86 publications

References 11 publications

Validity of Actigraphy in Measurement of Sleep in Young Adults With Type 1 Diabetes

Validity of Actigraphy in Measurement of Sleep in Young Adults With Type 1 Diabetes

Arabian Oryx (Oryx leucoryx) Respond to Increased Ambient Temperatures with a Seasonal Shift in the Timing of Their Daily Inactivity Patterns

Examining courses of sleep quality and sleepiness in full 2 weeks on/2 weeks off offshore day shift rotations

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