Newly developed waist actigraphy and its sleep/wake scoring algorithm

Enomoto, Minori; Endo, Tokiko; Suenaga, Kazue; Miura, Naoki; Nakano, Yukiko; Kohtoh, Sayaka; Taguchi, Yujiro; Aritake, Sayaka; Higuchi, Shigekazu; Matsuura, Masato; Takahashi, Keiichi; Mishima, Kazuo

doi:10.1111/j.1479-8425.2008.00377.x

Cited by 52 publications

(59 citation statements)

References 17 publications

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“…A sleep scoring algorithm from a different waist‐worn actigraph has recently been developed from the simultaneous measure of polysomnography and actigraphy in 31 healthy adults 21 . The authors found sensitivity, specificity and accuracy of 89.4, 58.2 and 86.9%, which is comparable to what has been seen with wrist as the attachment site in other studies 13,14,16 .…”

Section: Discussionmentioning

confidence: 69%

Measure of sleep and physical activity by a single accelerometer: Can a waist-worn Actigraph adequately measure sleep in children?

Hjorth

Chaput

Damsgaard

et al. 2012

Sleep and Biological Rhythms

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Accelerometers could potentially be used to assess physical activity and sleep using the same monitor; however, two different positions are typically used for the assessment of physical activity and sleep (waist and wrist, respectively). The aim of this study is to evaluate the concordance between wrist‐ and waist‐worn Actigraphs for sleep scoring using existing algorithms developed for placement on the wrist. Sixty‐two Danish children aged 10.3 ± 0.6 years (mean ± standard deviation) wore an accelerometer (Actigraph GT3X+ Tri‐Axis Accelerometer Monitor) on the right hip and on the non‐dominant wrist for a continuous 7 days and 8 nights. The minute‐by‐minute sleep–wake agreement was evaluated and the concordance among sleep indicators was assessed using one‐way ANOVA, Bland–Altman plots and Pearson correlations. The sensitivity, specificity and accuracy were 98.8–99.7, 29.8–46.9 and 86.6–88.9%, respectively. Total sleep time and sleep efficiency were higher when assessed from the waist compared to the wrist measurement site (73.8 min, P < 0.001; 12.6%, P < 0.001, respectively). In conclusion, the waist‐worn and wrist‐worn Actigraph monitors cannot be used interchangeably for the measurement of sleep indicators in children using the present algorithms. However, the waist‐worn Actigraph monitor can provide a proxy measure of total sleep time for ranking purposes in epidemiologic studies.

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Section: Discussionmentioning

confidence: 69%

Measure of sleep and physical activity by a single accelerometer: Can a waist-worn Actigraph adequately measure sleep in children?

Hjorth

Chaput

Damsgaard

et al. 2012

Sleep and Biological Rhythms

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“…The details of the actigraphy procedure were described in previous studies [17,18]. Briefly, a waist-worn actigraph (FS-750; Estera Corporation, Saitama, Japan) was used to record sleep parameters.…”

Section: Methodsmentioning

confidence: 99%

“…An algorithm for the FS-750 actigraph that determines sleep and wakefulness was included in the SleepSignAct software (Kissei Comtec Co. Ltd., Matsumoto, Japan); the formula used and validation of the process for use in polysomnography (PSG) has been described in previous studies [17,18]. According to this algorithm, total sleep time was calculated as the amount of total time in bed after subtraction of the periods of wakefulness.…”

Section: Methodsmentioning

confidence: 99%

Night duty and decreased brain activity of medical residents: a wearable optical topography study

Nishida

Kikuchi

Miwakeichi

et al. 2017

Medical Education Online

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Background: Overwork, fatigue, and sleep deprivation due to night duty are likely to be detrimental to the performance of medical residents and can consequently affect patient safety. Objective: The aim of this study was to determine the possibility of deterioration of cerebral function of sleep-deprived, fatigued residents using neuroimaging techniques. Design: Six medical residents were instructed to draw blood from artificial vessels installed on the arm of a normal cooperator. Blood was drawn at a similar time of the day, before and after night duty. To assess sleep conditions during night duty, the participants wore actigraphy units throughout the period of night duty. Changes in cerebral hemodynamics, during the course of drawing blood, were measured using a wearable optical topography system. Results: The visual analogue scale scores after night duty correlated negatively with sleep efficiency during the night duty (ρ = −0.812, p = 0.050). The right prefrontal cortex activity was significantly decreased in the second trial after night duty compared with the first (p = 0.028). The extent of [oxy-Hb] decrease, indicating decreased activity, in the right dorsolateral prefrontal cortex correlated negatively with the Epworth sleepiness score after night duty (ρ = −0.841, p = 0.036). Conclusions: Sleep deprivation and fatigue after night duty, caused a decrease in the activity of the right dorsolateral prefrontal cortex of the residents, even with a relatively easy routine. This result implies that the brain activity of medical residents exposed to stress on night duty, although not substantially sleep-deprived, was impaired after the night duty, even though they apparently performed a simple medical technique appropriately. Reconsideration of the shift assignments of medical residents is strongly advised. Abbreviations: DLPFC: Dorsolateral prefrontal cortex; ESS: Epworth sleepiness scale; PSQI: Pittsburgh sleep quality index; ROI: Regions of interest; VAS: Visual analogue scale; WOT: Wearable optical topography

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“…For these purposes, inexpensive waist actigraphy (Enomoto et al, 2009) that can score sleep/wake from waist activity and a wireless transdermal photoelectric pulse wave sensor (Takahara et al, 2008) for autonomic activity during sleep were recently developed. However, both sensors must be worn, resulting in the same drawbacks as Act.…”

Section: Discussionmentioning

confidence: 99%

Automatic Sleep/Wake Scoring from Body Motion in Bed: Validation of a Newly Developed Sensor Placed under a Mattress

Kogure

Shirakawa

Shimokawa

et al. 2011

J Physiol Anthropol

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The purpose of this study was to formulate a "sleep/wake" scoring algorithm for processing activity measurements obtained using a newly developed nonwear actigraphy (NWA) device, and to test its validity. The NWA device has a highly sensitive pressure sensor and is placed under a mattress. It can continuously record the activity of a person lying on the mattress and identify an "in-bed/out-ofbed" state from the vibrations of the mattress. We formulated the sleep/wake scoring algorithm by using data obtained simultaneously by wrist actigraphy (Act) and the NWA device in 33 healthy participants. Agreement rate, sensitivity, and specificity with Act were 95.7%, 97.6%, and 75.8% (33 healthy people); the corresponding values were 85.9%, 89.1%, and 79.8% for 12 nursing home residents and 93.7%, 97.2%, and 60.8% for 60 nights for 6 healthy persons who slept 10 nights on their futons. Agreement rate, sensitivity, and specificity with polysomnography were in almost perfect agreement with Act (12 nights; 6 healthy persons who slept 2 nights). All our validation results indicate that the NWA device, placed under a mattress or a futon, can produce almost identical sleep/wake scores to Act. It is expected that the NWA device, a nonwear device for scoring sleep/wake and inbed/out-of-bed, enables convenient long-term sleep-related evaluation in various fields, including hospital settings, homecare settings, and care facility settings such as nursing homes.

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Newly developed waist actigraphy and its sleep/wake scoring algorithm

Cited by 52 publications

References 17 publications

Measure of sleep and physical activity by a single accelerometer: Can a waist-worn Actigraph adequately measure sleep in children?

Measure of sleep and physical activity by a single accelerometer: Can a waist-worn Actigraph adequately measure sleep in children?

Night duty and decreased brain activity of medical residents: a wearable optical topography study

Automatic Sleep/Wake Scoring from Body Motion in Bed: Validation of a Newly Developed Sensor Placed under a Mattress

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