Wrist Actigraphy

Martin, Jennifer L.; Hakim, Alex D.

doi:10.1378/chest.10-1872

Cited by 554 publications

(435 citation statements)

References 77 publications

(31 reference statements)

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“…39 Our work is most similar to a recent report by Tsai et al 25 with regard to the average number of self-reported naps observed in 41 third-trimester frequent nappers (6.80 ± 2.97) as well as the reduction in TST. We somewhat agree with their suggestion that napping might interfere with subsequent nighttime sleep quantity, and that it does not compromise subsequent nighttime sleep continuity.…”

supporting

confidence: 91%

Minimal Effect of Daytime Napping Behavior on Nocturnal Sleep in Pregnant Women

Ebert

Wood

Okun

2015

Journal of Clinical Sleep Medicine

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Study Objectives: To assess whether daytime naps negatively impact nocturnal sleep. Design: Longitudinal, prospective cohort design. Participants: 161 pregnant women recruited and evaluated in early gestation (10-20 weeks). Measurements and Results: Daily sleep information was collected in three 2-week periods (10-12, 14-16, and 18-20 weeks gestation) with a daily sleep diary and an actigraph. The average number of naps, as well as the average length of each nap, were calculated from sleep diaries. Women were categorized fi rst as non nappers (0 naps/2-week period), moderate nappers (1-3 naps/2-week period), or frequent nappers (≥ 4 naps/2-week period). Then, based on the average nap length, they were categorized as short (< 90 min) or long (≥ 90 min) nappers. Nocturnal sleep parameters included SOL, WASO, SE, and TST. SAS procedure MIXED was used for modeling the main effects of nap group and time, and time by nap group interactions. Women who took naps had a decrease in diary-assessed nocturnal TST, but not actigraphy-assessed TST. This observation was group-and time-specifi c. There were no other group differences. Women who napped ≥ 90 min had poorer diary-assessed SE and lower diary-assessed TST than those who took shorter naps. Length of nap was not associated with any other sleep measures. Conclusions:The number of daytime naps have minimal impact on nocturnal sleep parameters; however, long nappers did exhibit modestly impaired sleep continuity and sleep quality. Overall, we propose that daytime naps provide a benefi cial countermeasure to the sleep disruption commonly reported by pregnant women. This may be clinically benefi cial given that sleep continuity and quality are important correlates of pregnancy outcomes. T he majority of expectant women experience progressively disturbed, fragmented, and shortened nocturnal sleep as a result of normal physiological adaptations to the progressing pregnancy.1-3 Emerging evidence indicates that insuffi cient quantity and poor sleep quality are associated with increased risk of mood dysregulation , 4,5 as well as adverse pregnancy outcomes, such as preterm birth and gestational diabete s. 6-8When suffi cient nighttime sleep is not possible or unattainable, certain strategies can be implemented to counteract the negative effects of disturbed nocturnal sleep. One promising approach is to include daytime naps as part of a healthy sleep hygiene progra m. 9-11There is limited information examining the effects of daytime naps on nocturnal sleep outcomes in non-pregnant populations. The majority of evidence stems from examination of daytime naps in elderly or middle-aged individuals or children. The bulk, however, consider daytime naps as a positive health behavior (a "countermeasure") in that they can effectively combat subjectively reported poor sleep quality and decrease subjective daytime sleepiness by augmenting shortened nocturnal sleep durat ion.11-14 However, there is also a small literature that suggests that naps can be detrimental to nocturnal sleep and ne...

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supporting

confidence: 91%

Minimal Effect of Daytime Napping Behavior on Nocturnal Sleep in Pregnant Women

Ebert

Wood

Okun

2015

Journal of Clinical Sleep Medicine

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“…Actimetry is a noninvasive method in which trials were performed with a high sample with these kinds of assays and gives enough information to evaluate if a diet improves activity/inactivity circadian rhythm (Adamec et al 2010;Ancoli-Israel et al 2003). Wrist actimetry is a well-validated technique to study nocturnal sleep, as referenced elsewhere (Martin and Hakim 2011). This method has been used to determine disturbances in actual sleep time, sleep efficiency, sleep latency, wake bouts, and sleep fragmentation index in elderly people (Huang et al 2002).…”

Section: Discussionmentioning

confidence: 99%

Tryptophan-enriched cereal intake improves nocturnal sleep, melatonin, serotonin, and total antioxidant capacity levels and mood in elderly humans

Bravo

Matito²,

Juánez

et al. 2012

AGE

152

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Melatonin and serotonin rhythms, which exhibit a close association with the endogenous circadian component of sleep, are attenuated with increasing age. This decrease seems to be linked to sleep alterations in the elderly. Chrononutrition is a field of chronobiology that establishes the principle of consuming foodstuffs at times of the day when they are more useful for health, improving, therefore, biorhythms and physical performance. Our aim was to analyze whether the consumption of cereals enriched with tryptophan, the precursor of both serotonin and melatonin, may help in the reconsolidation of the sleep/wake cycle and counteract depression and anxiety in 35 middle-aged/elderly (aged 55-75 year) volunteers in a simple blind assay. Data were collected for 3 weeks according to the following schedule: The control week participants consumed standard cereals (22.5 mg tryptophan in 30 g cereals per dose) at breakfast and dinner; for the treatment week, cereals enriched with a higher dose of tryptophan (60 mg tryptophan in 30 g cereals per dose) were eaten at both breakfast and dinner; the posttreatment week volunteers consumed their usual diet. Each participant wore a wrist actimeter that logged activity during the whole experiment. Urine was collected to analyze melatonin and serotonin urinary metabolites and to measure total antioxidant capacity. The consumption of cereals containing the higher dose in tryptophan increased sleep efficiency, actual sleep time, immobile time, and decreased total nocturnal activity, sleep fragmentation index, and sleep latency. Urinary 6-sulfatoxymelatonin, 5-hydroxyindoleacetic acid levels, and urinary total antioxidant capacity also increased respectively after tryptophan-enriched cereal ingestion as well as improving anxiety and depression symptoms. Cereals enriched

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“…4 The Actiwatch2 (Philips Respironics, Oregon, United States) is a widely used actigraph worn on the nondominant wrist that has the capability to determine sleep and wake patterns. 5 It has been validated against PSG in healthy children 6 and adults. 3 Sleep parameters can be derived from Actiwatch2 recordings using three different threshold settings (low, medium, or high) for detection of wake-related accelerations (movements) before…”

Section: Introductionmentioning

confidence: 99%

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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Wrist Actigraphy

Cited by 554 publications

References 77 publications

Minimal Effect of Daytime Napping Behavior on Nocturnal Sleep in Pregnant Women

Minimal Effect of Daytime Napping Behavior on Nocturnal Sleep in Pregnant Women

Tryptophan-enriched cereal intake improves nocturnal sleep, melatonin, serotonin, and total antioxidant capacity levels and mood in elderly humans

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

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