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Torimoto K, Gotoh D, Nakai Y, Miyake M, Fujimoto K. Electroencephalography-based investigation of the effects of oral desmopressin on improving slow-wave sleep time in nocturnal polyuria patients (the DISTINCT study): A single-arm, open-label, single-assignment trial. Neurourol Urodyn 2024; 43:1559-1565. [PMID: 38606623 DOI: 10.1002/nau.25476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 04/02/2024] [Accepted: 04/04/2024] [Indexed: 04/13/2024]
Abstract
AIMS To investigate changes in subjective and objective sleep quality after desmopressin administration in patients with nocturia due to nocturnal polyuria (NP) using electroencephalography (EEG) and the Pittsburgh sleep quality index (PSQI). METHODS Twenty male patients (≥65 years old) with NP participated in this study. The inclusion criteria were nocturnal frequency ≥ 2, NP index (NPi) ≥ 0.33, first uninterrupted sleep period (FUSP) ≤ 2.5 h, serum sodium concentration ≥ 135 mEq/L, and estimated glomerular filtration rate ≥ 50 mL/min/1.73 m2. Participants were given 50 μg of desmopressin to be taken orally once daily before bed. The primary endpoint was the change in the duration of slow-wave sleep (nonrapid eye movement sleep stages 3 and 4), as evaluated by EEG 28 days from the baseline. The visual analog scale (VAS) was used as an additional indicator of sleep quality. RESULTS Analysis of data from 15 participants (median age: 74.0 [70.5, 76.0] years) revealed that from before to after desmopressin administration, significant decreases occurred in the median nocturnal frequency (3.0 [2.0, 4.0] to 1.5 [1.0, 2.0]) and NPi (0.445 [0.380, 0.475] to 0.360 [0.250, 0.430]). Furthermore, FUSP was significantly prolonged from 120.0 (94.0, 150.0) min to 210.0 (203.8, 311.3) min. Although the VAS scores improved, slow-wave sleep duration and the PSQI global score showed no significant differences (68.50 [47.50, 75.50] and 48.00 [38.00, 66.50]; 5.0 [5.0, 10.0] and 7.0 [5.0, 9.0] min, respectively). CONCLUSION Oral administration of 50 μg desmopressin improved nocturnal frequency and FUSP in older individuals with NP but did not significantly enhance sleep quality. In older adults, decreased nighttime urinary frequency may enhance quality of life; however, its influence on objective sleep quality may be limited.
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Affiliation(s)
- Kazumasa Torimoto
- Department of Urology, Nara Medical University Hospital, Kashihara, Japan
| | - Daisuke Gotoh
- Department of Urology, Nara Medical University Hospital, Kashihara, Japan
| | - Yasushi Nakai
- Department of Urology, Nara Medical University Hospital, Kashihara, Japan
| | - Makito Miyake
- Department of Urology, Nara Medical University Hospital, Kashihara, Japan
| | - Kiyohide Fujimoto
- Department of Urology, Nara Medical University Hospital, Kashihara, Japan
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Tajitsu Y, Shimda S, Nonomura T, Yanagimoto H, Nakamura S, Ueshima R, Kawanobe M, Nakiri T, Takarada J, Takeuchi O, Nisho R, Takeshita K, Takahashi M, Sugiyama K. Application of Braided Piezoelectric Poly-l-Lactic Acid Cord Sensor to Sleep Bruxism Detection System with Less Physical or Mental Stress. MICROMACHINES 2023; 15:86. [PMID: 38258205 PMCID: PMC10819301 DOI: 10.3390/mi15010086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Revised: 12/23/2023] [Accepted: 12/26/2023] [Indexed: 01/24/2024]
Abstract
For many years, we have been developing flexible sensors made of braided piezoelectric poly-l-lactic acid (PLLA) fibers that can be tied and untied for practical applications in society. To ensure good quality of sleep, the occurrence of bruxism has been attracting attention in recent years. Currently, there is a need for a system that can easily and accurately measure the frequency of bruxism at home. Therefore, taking advantage of the braided piezoelectric PLLA cord sensor's unique characteristic of being sewable, we aimed to provide a system that can measure the frequency of bruxism using the braided piezoelectric PLLA cord sensor simply sewn onto a bed sheet on which the subject lies down. After many tests using trial and error, the sheet sensor was completed with zigzag stitching. Twenty subjects slept overnight in a hospital room on sheets integrated with a braided piezoelectric PLLA cord. Polysomnography (PSG) was simultaneously performed on these subjects. The results showed that their bruxism could be detected with an accuracy of more than 95% compared with PSG measurements, which can only be performed in a hospital by a physician and are more burdensome for the subjects, with the subjects simply lying on the bed sheet with a braided piezoelectric PLLA cord sensor sewn into it.
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Affiliation(s)
- Yoshiro Tajitsu
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Osaka 564-8680, Japan; (H.Y.); (S.N.); (R.U.); (M.K.); (T.N.); (J.T.)
| | - Saki Shimda
- Nishikawa Co., Ltd., Chuo, Tokyo 103-0006, Japan; (S.S.); (T.N.)
| | - Takuto Nonomura
- Nishikawa Co., Ltd., Chuo, Tokyo 103-0006, Japan; (S.S.); (T.N.)
| | - Hiroki Yanagimoto
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Osaka 564-8680, Japan; (H.Y.); (S.N.); (R.U.); (M.K.); (T.N.); (J.T.)
| | - Shun Nakamura
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Osaka 564-8680, Japan; (H.Y.); (S.N.); (R.U.); (M.K.); (T.N.); (J.T.)
| | - Ryoma Ueshima
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Osaka 564-8680, Japan; (H.Y.); (S.N.); (R.U.); (M.K.); (T.N.); (J.T.)
| | - Miyu Kawanobe
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Osaka 564-8680, Japan; (H.Y.); (S.N.); (R.U.); (M.K.); (T.N.); (J.T.)
| | - Takuo Nakiri
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Osaka 564-8680, Japan; (H.Y.); (S.N.); (R.U.); (M.K.); (T.N.); (J.T.)
| | - Jun Takarada
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Osaka 564-8680, Japan; (H.Y.); (S.N.); (R.U.); (M.K.); (T.N.); (J.T.)
| | - Osamu Takeuchi
- Faculty of Foreign Language Studies, Kansai University, Osaka 564-8680, Japan;
| | - Rei Nisho
- Teijin Frontier Co., Ltd., Kita, Osaka 530-8605, Japan; (R.N.); (K.T.)
| | - Koji Takeshita
- Teijin Frontier Co., Ltd., Kita, Osaka 530-8605, Japan; (R.N.); (K.T.)
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Yamazaki F, Inoue K, Ohmi N, Okimoto C. A two-week exercise intervention improves cold symptoms and sleep condition in cold-sensitive women. J Physiol Anthropol 2023; 42:22. [PMID: 37773205 PMCID: PMC10540373 DOI: 10.1186/s40101-023-00339-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 09/19/2023] [Indexed: 10/01/2023] Open
Abstract
BACKGROUND We examined whether an aerobic exercise intervention in young women with cold sensitivity symptoms improves sleep quality and decreases cold complaints. Furthermore, we examined the association with increased foot skin temperature (Tsk) before falling asleep and decrease in sensitivity to cold in the brain. METHODS We recruited 16 female adult volunteers who had cold sensitivity and were not engaged in daily exercise training, and they were divided into an exercise group (EXE) and a control group (CON). EXE was given a 2-week exercise intervention that consisted mainly of walking and jogging. Before and after the intervention, temperature sensation and body temperature parameters were measured just before bedtime; electroencephalogram measurements were taken during sleep; and subjective sleep surveys, including Oguri-Shirakawa-Azumi (OSA) sleep inventory (middle-aged and aged version) and visual analogue scale (VAS), were conducted immediately after waking up. All experiments were performed in the winter season. RESULTS In EXE, overall and foot warmth and comfort increased (p < 0.05) after the 2-week exercise intervention. The exercise intervention also decreased (p < 0.05) the scores for cold feeling in the fingertips, feet, and toes. In the OSA sleep inventory, factor IV (refreshing) and factor V (sleep length) were increased (p < 0.05) by the exercise intervention. Subjective sleep quality evaluated by VAS increased (p < 0.05) with exercise intervention. The exercise intervention in EXE shortened middle awake time after sleep onset (p < 0.05) and prolonged deep sleep length (p < 0.05). The exercise intervention increased (p < 0.05) alpha-wave power before sleep. In CON, all variables remained unchanged throughout the 2-week control period. CONCLUSION Short-term aerobic exercise alleviated peripheral extremity cold sensitivity symptoms and improved subjective sleep quality. Our findings suggest that these improvements were not due to increased Tsk at rest before bedtime but to decreased sensitivity to cold in the brain that was expressed as increased alpha activity.
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Affiliation(s)
- Fumio Yamazaki
- Department of Nursing, Faculty of Nursing and Human Nutrition, Yamaguchi Prefectural University, 6-2-1 Sakurabatake, Yamaguchi, 753-0021, Japan.
| | - Kana Inoue
- Department of Nursing, Faculty of Nursing and Human Nutrition, Yamaguchi Prefectural University, 6-2-1 Sakurabatake, Yamaguchi, 753-0021, Japan
| | - Nanako Ohmi
- Department of Nursing, Faculty of Nursing and Human Nutrition, Yamaguchi Prefectural University, 6-2-1 Sakurabatake, Yamaguchi, 753-0021, Japan
| | - Chika Okimoto
- Department of Nursing, Faculty of Nursing and Human Nutrition, Yamaguchi Prefectural University, 6-2-1 Sakurabatake, Yamaguchi, 753-0021, Japan
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Yin J, Xu J, Ren TL. Recent Progress in Long-Term Sleep Monitoring Technology. BIOSENSORS 2023; 13:395. [PMID: 36979607 PMCID: PMC10046225 DOI: 10.3390/bios13030395] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 03/11/2023] [Accepted: 03/14/2023] [Indexed: 06/18/2023]
Abstract
Sleep is an essential physiological activity, accounting for about one-third of our lives, which significantly impacts our memory, mood, health, and children's growth. Especially after the COVID-19 epidemic, sleep health issues have attracted more attention. In recent years, with the development of wearable electronic devices, there have been more and more studies, products, or solutions related to sleep monitoring. Many mature technologies, such as polysomnography, have been applied to clinical practice. However, it is urgent to develop wearable or non-contacting electronic devices suitable for household continuous sleep monitoring. This paper first introduces the basic knowledge of sleep and the significance of sleep monitoring. Then, according to the types of physiological signals monitored, this paper describes the research progress of bioelectrical signals, biomechanical signals, and biochemical signals used for sleep monitoring. However, it is not ideal to monitor the sleep quality for the whole night based on only one signal. Therefore, this paper reviews the research on multi-signal monitoring and introduces systematic sleep monitoring schemes. Finally, a conclusion and discussion of sleep monitoring are presented to propose potential future directions and prospects for sleep monitoring.
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Affiliation(s)
- Jiaju Yin
- School of Integrated Circuits, Tsinghua University, Beijing 100084, China
- Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing 100084, China
| | - Jiandong Xu
- School of Integrated Circuits, Tsinghua University, Beijing 100084, China
- Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing 100084, China
| | - Tian-Ling Ren
- School of Integrated Circuits, Tsinghua University, Beijing 100084, China
- Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing 100084, China
- Center for Flexible Electronics Technology, Tsinghua University, Beijing 100084, China
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Tajitsu Y, Takarada J, Hikichi T, Sugii R, Takatani K, Yanagimoto H, Nakanishi R, Shiomi S, Kitamoto D, Nakiri T, Takeuchi O, Deguchi M, Muto T, Kuroki K, Amano W, Misumi A, Takahashi M, Sugiyama K, Tanabe A, Kamohara S, Nisho R, Takeshita K. Application of Piezoelectric PLLA Braided Cord as Wearable Sensor to Realize Monitoring System for Indoor Dogs with Less Physical or Mental Stress. MICROMACHINES 2023; 14:143. [PMID: 36677204 PMCID: PMC9865504 DOI: 10.3390/mi14010143] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 12/29/2022] [Accepted: 01/03/2023] [Indexed: 06/17/2023]
Abstract
We attempted to realize a prototype system that monitors the living condition of indoor dogs without physical or mental burden by using a piezoelectric poly-l-lactic acid (PLLA) braided cord as a wearable sensor. First, to achieve flexibility and durability of the piezoelectric PLLA braided cord used as a sensor for indoor dogs, the process of manufacturing the piezoelectric PLLA fiber for the piezoelectric braided cord was studied in detail and improved to achieve the required performance. Piezoelectric PLLA braided cords were fabricated from the developed PLLA fibers, and the finite element method was used to realize an e-textile that can effectively function as a monitoring sensor. As a result, we realized an e-textile that feels similar to a high-grade textile and senses the complex movements of indoor dogs without the use of a complex computer system. Finally, a prototype system was constructed and applied to an actual indoor dog to demonstrate the usefulness of the e-textile as a sensor for indoor dog monitoring.
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Affiliation(s)
- Yoshiro Tajitsu
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Jun Takarada
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Tokiya Hikichi
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Ryoji Sugii
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Kohei Takatani
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Hiroki Yanagimoto
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Riku Nakanishi
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Seita Shiomi
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Daiki Kitamoto
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Takuo Nakiri
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Osamu Takeuchi
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita 5640-8680, Japan
| | - Miki Deguchi
- Tokyo IoT Technology Department, 5G & IoT Engineering Division, Softbank Co., Kaigan, Tokyo 105-7529, Japan
| | - Takanori Muto
- Tokyo IoT Technology Department, 5G & IoT Engineering Division, Softbank Co., Kaigan, Tokyo 105-7529, Japan
| | - Kazuaki Kuroki
- Tokyo IoT Technology Department, 5G & IoT Engineering Division, Softbank Co., Kaigan, Tokyo 105-7529, Japan
| | - Wataru Amano
- Tokyo IoT Technology Department, 5G & IoT Engineering Division, Softbank Co., Kaigan, Tokyo 105-7529, Japan
| | - Ayaka Misumi
- Tokyo IoT Technology Department, 5G & IoT Engineering Division, Softbank Co., Kaigan, Tokyo 105-7529, Japan
| | | | | | - Akira Tanabe
- Renesas Electronics Co., Ltd., Toyosu, Tokyo 135-0061, Japan
| | - Shiro Kamohara
- Renesas Electronics Co., Ltd., Toyosu, Tokyo 135-0061, Japan
| | - Rei Nisho
- Teijin Frontier Co., Ltd., Kita, Osaka 530-8605, Japan
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Chen Z, Yang Z, Wang D, Zhu X, Ono N, Altaf-Ul-Amin MD, Kanaya S, Huang M. Sleep Staging Framework with Physiologically Harmonized Sub-Networks. Methods 2023; 209:18-28. [PMID: 36436760 DOI: 10.1016/j.ymeth.2022.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 11/15/2022] [Accepted: 11/21/2022] [Indexed: 11/26/2022] Open
Abstract
Sleep screening is an important tool for both healthcare and neuroscientific research. Automatic sleep scoring is an alternative to the time-consuming gold-standard manual scoring procedure. Recently there have seen promising results on automatic stage scoring by extracting spatio-temporal features via deep neural networks from electroencephalogram (EEG). However, such methods fail to consistently yield good performance due to a missing piece in data representation: the medical criterion of the sleep scoring task on top of EEG features. We argue that capturing stage-specific features that satisfy the criterion of sleep medicine is non-trivial for automatic sleep scoring. This paper considers two criteria: Transient stage marker and Overall profile of EEG features, then we propose a physiologically meaningful framework for sleep stage scoring via mixed deep neural networks. The framework consists of two sub-networks: feature extraction networks, constructed in consideration of the physiological characteristics of sleep, and an attention-based scoring decision network. Moreover, we quantize the framework for potential use under an IoT setting. For proof-of-concept, the performance of the proposed framework is demonstrated by introducing multiple sleep datasets with the largest comprising 42,560 h recorded from 5,793 subjects. From the experiment results, the proposed method achieves a competitive stage scoring performance, especially for Wake, N2, and N3, with higher F1 scores of 0.92, 0.86, and 0.88, respectively. Moreover, the feasibility analysis of framework quantization provides a potential for future implementation in the edge computing field and clinical settings.
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Affiliation(s)
- Zheng Chen
- Graduate School of Engineering Science, Osaka University, Japan.
| | - Ziwei Yang
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Japan
| | - Dong Wang
- Graduate School and Faculty of Information Science and Electrical Engineering, Kyushu University, Japan
| | - Xin Zhu
- Biomedical Information Engineering Lab, The University of Aizu, Japan
| | - Naoaki Ono
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Japan; Data Science Center, Nara Insitute of Science and Technology, Japan
| | - M D Altaf-Ul-Amin
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Japan
| | - Shigehiko Kanaya
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Japan; Data Science Center, Nara Insitute of Science and Technology, Japan
| | - Ming Huang
- Graduate School of Science and Technology, Nara Institute of Science and Technology, Japan; Data Science Center, Nara Insitute of Science and Technology, Japan.
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Ogata H, Nishikawa T, Kayaba M, Kaneko M, Ogawa K, Kiyono K. Effect of Seat Angle when Sleeping in a Car on Quality of Sleep and Its Impact on Calculation Performance the Following Day. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:12270. [PMID: 36231565 PMCID: PMC9566686 DOI: 10.3390/ijerph191912270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 09/21/2022] [Accepted: 09/24/2022] [Indexed: 06/16/2023]
Abstract
The number of occasions to stay in a car overnight is increasing during disasters; however, the effects on sleep and the impact on daytime functioning are not well understood. We investigated the effect of seat angle when sleeping in a car and its impact on calculation performance the following day. Fifteen healthy males participated in three trials (sleeping in a car with the front seat angled at 45° and 60° in a laboratory and sleeping at home); sleep and calculation performance the following day were compared. Increased wake after sleep onset and decreased slow-wave sleep were observed in the 60° trial, that is, near-vertical, compared with the others. Subjective sleep quality and calculation performance in the 45° and 60° trials were poorer than those in the home trial. The effect of seat angle on sleep was confirmed objectively, but not subjectively, suggesting that a large seat angle might cause sleep impairment.
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Affiliation(s)
- Hitomi Ogata
- Graduate School of Humanities and Social Sciences, Hiroshima University, Hiroshima 739-8521, Japan
| | - Tomohiro Nishikawa
- Graduate School of Humanities and Social Sciences, Hiroshima University, Hiroshima 739-8521, Japan
| | - Momoko Kayaba
- Department of Somnology, Tokyo Medical University, Tokyo 160-0023, Japan
| | - Miki Kaneko
- Graduate School of Engineering Science, Osaka University, Osaka 565-8531, Japan
| | - Keiko Ogawa
- Graduate School of Humanities and Social Sciences, Hiroshima University, Hiroshima 739-8521, Japan
| | - Ken Kiyono
- Graduate School of Engineering Science, Osaka University, Osaka 565-8531, Japan
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Kamon M, Okada S, Furuta M, Yoshida K. Development of a non-contact sleep monitoring system for children. Front Digit Health 2022; 4:877234. [PMID: 36003190 PMCID: PMC9393414 DOI: 10.3389/fdgth.2022.877234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 07/19/2022] [Indexed: 11/13/2022] Open
Abstract
Daily monitoring is important, even for healthy children, because sleep plays a critical role in their development and growth. Polysomnography is necessary for sleep monitoring. However, measuring sleep requires specialized equipment and knowledge and is difficult to do at home. In recent years, smartwatches and other devices have been developed to easily measure sleep. However, they cannot measure children's sleep, and contact devices may disturb their sleep.A non-contact method of measuring sleep is the use of video during sleep. This is most suitable for the daily monitoring of children’s sleep, as it is simple and inexpensive. However, the algorithms have been developed only based on adult sleep, whereas children’s sleep is known to differ considerably from that of adults.For this reason, we conducted a non-contact estimation of sleep stages for children using video. The participants were children between the ages of 0–6 years old. We estimated the four stages of sleep using the body movement information calculated from the videos recorded. Six parameters were calculated from body movement information. As children’s sleep is known to change significantly as they grow, estimation was divided into two groups (0–2 and 3–6 years).The results show average estimation accuracies of 46.7 ± 6.6 and 49.0 ± 4.8% and kappa coefficients of 0.24 ± 0.11 and 0.28 ± 0.06 in the age groups of 0–2 and 3–6 years, respectively. This performance is comparable to or better than that reported in previous adult studies.
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Affiliation(s)
- Masamitsu Kamon
- Department of Robotics, Ritsumeikan University, Shiga, Japan
- Correspondence: Masamitsu Kamon
| | - Shima Okada
- Department of Robotics, Ritsumeikan University, Shiga, Japan
| | - Masafumi Furuta
- Technology Research Laboratory, Shimadzu Corporation, Kyoto, Japan
| | - Koki Yoshida
- Technology Research Laboratory, Shimadzu Corporation, Kyoto, Japan
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Nishida M, Ichinose A, Murata Y, Shioda K. Effect of napping on a bean bag chair on sleep stage, muscle activity, and heart rate variability. PeerJ 2022; 10:e13284. [PMID: 35573181 PMCID: PMC9097667 DOI: 10.7717/peerj.13284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 03/26/2022] [Indexed: 01/13/2023] Open
Abstract
Background Although ample evidence has demonstrated that daytime napping is beneficial for health and cognitive performance, bedding for napping has not yet been scientifically investigated. Objectives To explore the effect of a bean bag chair on daytime napping and physiological parameters related to sleep. Methods Fourteen healthy participants were enrolled within the context of a randomized, single-blind, crossover study to evaluate the effects of a bean bag chair in comparison with those of a urethane chair manufactured to have a similar shape. Electroencephalogram, electromyogram, and heart rate variability were recorded and compared between wakefulness and napping. Results Electroencephalogram analyses revealed no significant differences in sleep architecture or frequency components; however, a significant decrease was found in electromyogram recordings in the trapezius muscle, which represents the neck region (p = 0.019). Additionally, a significant main effect of bedding in the low-frequency/high-frequency ratio (F[1,20] = 4.314, p = 0.037) was revealed. Conclusions These results suggest that napping in a bean bag chair may provide a comfortable napping environment involving muscle relaxation and proper regulation of the autonomic nervous function.
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Affiliation(s)
- Masaki Nishida
- Faculty of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan
- Sleep Research Institute, Waseda University, Shinjuku, Tokyo, Japan
| | - Atsushi Ichinose
- Faculty of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan
- Sleep Research Institute, Waseda University, Shinjuku, Tokyo, Japan
| | - Yusuke Murata
- Sleep Research Institute, Waseda University, Shinjuku, Tokyo, Japan
| | - Kohei Shioda
- Sleep Research Institute, Waseda University, Shinjuku, Tokyo, Japan
- Faculty of Human Sciences, Kanazawa Seiryo University, Kanazawa, Ishikawa, Japan
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Two-Channel Portable Biopotential Recording System Can Detect REM Sleep Behavioral Disorder: Validation Study with a Comparison of Polysomnography. PARKINSON'S DISEASE 2022; 2022:1888682. [PMID: 35251588 PMCID: PMC8894016 DOI: 10.1155/2022/1888682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 02/04/2022] [Accepted: 02/05/2022] [Indexed: 12/02/2022]
Abstract
Background Sleep disorders are frequent nonmotor symptoms of Parkinson's disease (PD). Polysomnography (PSG) has been the gold standard for its assessment. However, it requires patients to stay overnight in a hospital or sleep center. The mobile two-channel electroencephalography (EEG)/electrooculography (EOG) recording system is a self-applicable and affordable method to objectively assess sleep at home. We aimed at evaluating patients with PD to confirm the difference in sleep parameters between the portable recording system and PSG. Methods PSG and the portable recording system were simultaneously performed on a similar night in eight patients with PD. We compared the difference in sleep parameters between them using nonparametric tests. Results All patients displayed a score of both PDSS −2 ≥ 15 and PSQI ≥ 5, respectively, which revealed poor sleep quality. There was no difference in the sleep parameters between the portable recording system and PSG, except for the percentage of sleep stage N3. Regarding the detection of REM sleep without atonia, we observed accordance between the portable recording system and PSG in six patients (P=0.686). Conclusions The portable EEG/EOG recording system may gain an advantage from home-based evaluations for habitual sleep at home. Our study on device validation may contribute to measuring natural sleep, including rapid eye movement (REM) sleep behavioral disorder (RBD), in an outpatient care setting.
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Kataoka H, Isogawa M, Inoue T, Hasebe M, Takashima R, Kasama S, Nanaura H, Kiriyama T, Kasahara M, Sugie K. Zonisamide for the Efficacy of Sleep Abnormality in Parkinson's Disease (ZEAL Study): A Protocol for Randomized Controlled Trials. Front Neurol 2022; 12:741307. [PMID: 34970203 PMCID: PMC8713296 DOI: 10.3389/fneur.2021.741307] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 11/05/2021] [Indexed: 11/15/2022] Open
Abstract
Background: Sleep disorders are one of the most frequent non-motor symptoms of Parkinson's disease (PD), and the efficacy of dopaminergic agents remains controversial. Clinical randomized control trials for the treatment of sleep disorders in PD are limited. Zonisamide (1,2-benzisoxazole-3-methanesulfonamide) improved motor symptoms and wearing-off in patients with PD. Patients with PD were reported to have dream-enacting behavior that was resolved after treatment with zonisamide. This study aimed to verify the safety and efficacy of zonisamide for sleep disorders and rapid eye movement (REM) sleep behavioral disorders using a mobile two-channel electroencephalography (EEG)/electrooculography (EOG) recording system. Methods and Analysis: The present study is a randomized placebo-controlled trial to determine the efficacy of zonisamide for sleep disorders in patients with PD. This study was designed to be single-blind, but the subject allocation is randomized by an independent allocation manager via computer-generated block randomization. The subjects in the treatment group took zonisamide (25 mg per day) before bedtime for 28 days. The sleep index is analyzed using a portable EEG/EOG recording system collected on two consecutive nights within 7 days prior to the intervention and reobtained on one night within 2 days after the 28-day administration of zonisamide. The amount of change in sleep efficiency before and after the 28-day administration will be compared between the zonisamide treatment group and placebo group concerning the primary endpoint. As for the secondary endpoint, the change in the ratio of other sleep parameters, including REM sleep without atonia, or sleep architecture will be evaluated. Ethics and Dissemination: The protocol was approved by the Nara Medical University Certified Review Board (CRB5200002). The trial was notified and registered with the Japan Registry of Clinical Trials (jRCTs051200160). Written informed consent will be obtained from every participant using informed consent approved by the CRB. The results of this trial will be disseminated through peer-reviewed scientific journals.
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Affiliation(s)
- Hiroshi Kataoka
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Masahiro Isogawa
- Institute for Clinical and Translational Science, Nara Medical University Hospital, Kashihara, Japan
| | - Takashi Inoue
- Institute for Clinical and Translational Science, Nara Medical University Hospital, Kashihara, Japan
| | - Miyoko Hasebe
- Institute for Clinical and Translational Science, Nara Medical University Hospital, Kashihara, Japan
| | - Ryuzo Takashima
- Institute for Clinical and Translational Science, Nara Medical University Hospital, Kashihara, Japan
| | - Shu Kasama
- Institute for Clinical and Translational Science, Nara Medical University Hospital, Kashihara, Japan
| | - Hitoki Nanaura
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Takao Kiriyama
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Masato Kasahara
- Institute for Clinical and Translational Science, Nara Medical University Hospital, Kashihara, Japan
| | - Kazuma Sugie
- Department of Neurology, Nara Medical University, Kashihara, Japan
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12
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Imai H, Haraki S, Tsujisaka A, Okura M, Adachi H, Ohno Y, Yatani H, Kato T. A lack of specific motor patterns between rhythmic/non-rhythmic masticatory muscle activity and bodily movements in sleep bruxism. J Prosthodont Res 2021; 65:415-420. [PMID: 33281172 DOI: 10.2186/jpr.jpr_d_20_00012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Purpose The aims of the present study were to investigate the temporal relationships between jaw and bodily movements and clarify motor processes in the genesis of rhythmic masticatory muscle activity (RMMA) in sleep bruxism (SB).Methods Video-polysomnography recordings were obtained from ten subjects with SB (mean age: 23.4 ± 1.6 years) and ten matched normal controls (CTL) (mean age: 24.4 ± 3.2 years). RMMA and nonspecific masseter activity (NSMA) were scored in association with bodily movements in the leg, arm, head, and trunk using electromyography and video recordings. The relationship between oromotor episodes and bodily movements was assessed in terms of sleep stage distributions and temporal relationships. Cardiac changes preceding oromotor episodes in stage N2 were assessed.Results Approximately 80% of RMMA and NSMA were associated with movements in one or more body sites. RMMA and NSMA were more frequently associated with movements of the leg (70-75%) and arm (40-55%) than movements of the head (17-22%) and trunk (5-25%). The relationship between oromotor episodes and bodily movements did not significantly differ among sleep stages. Oromotor episodes and bodily movements did not show a consistent temporal pattern in the SB and CTL groups. Regardless of the temporal relationship between oromotor episodes and bodily movements, the mean heart rate significantly increased by 5 beats before the onset of oromotor episodes.Conclusions No specific temporal motor patterns were found between RMMA and bodily movements. RMMA and NSMA represent a repertoire of arousal-related autonomic motor responses during sleep.
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Affiliation(s)
- Hideto Imai
- Faculty of Nursing, Setsunan University, Osaka, Japan
| | - Shingo Haraki
- Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Akiko Tsujisaka
- Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Mutsumi Okura
- Center for Sleep Medicine, Department of Neurology Asahi University Hospital, Gifu, Japan.,Department of Oral Physiology, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Hiroyoshi Adachi
- Health and Counseling Center, Osaka University, Osaka, Japan.,Sleep Medicine Center, Osaka University Hospital, Osaka, Japan
| | - Yuko Ohno
- Department of Health Sciences, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hirofumi Yatani
- Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - Takafumi Kato
- Department of Oral Physiology, Osaka University Graduate School of Dentistry, Osaka, Japan.,Sleep Medicine Center, Osaka University Hospital, Osaka, Japan
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13
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Tajitsu Y, Takarada J, Takatani K, Nakanishi R, Yanagimoto H, Shiomi S, Nakagawa I, Kawahara I, Nakiri T, Shimda S, Shimura Y, Nonomura T, Kojima K, Ikeguch A, Okayama K, Sakai T, Morioka Y, Takahashi M, Sugiyama K, Nisho R, Takeshita K. A Prototype Sensor System Using Fabricated Piezoelectric Braided Cord for Work-Environment Measurement during Work from Home. MICROMACHINES 2021; 12:966. [PMID: 34442588 PMCID: PMC8400097 DOI: 10.3390/mi12080966] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 08/07/2021] [Accepted: 08/09/2021] [Indexed: 11/16/2022]
Abstract
We proposed a new prototype sensor system to understand the workload of employees during telework. The goal of sensing using such a system is to index the degree of stress experienced by employees during work and recognize how to improve their work environment. Currently, to realize this, image processing technology with a Web camera is generally used for vital sign sensing. However, it creates a sense of discomfort at work because of a strong sense of surveillance. To truly evaluate a working environment, it is necessary that an employee be unaware of the sensor system and for the system to be as unobtrusive as possible. To overcome these practical barriers, we have developed a new removable piezoelectric sensor incorporated in a piezoelectric poly-L-lactic acid (PLLA) braided cord. This cord is soft and flexible, and it does not cause any discomfort when attached to the cushion cover sheet. Thus, it was possible to measure the workload of an employee working from home without the employee being aware of the presence of a sensor. Additionally, we developed a system for storing data in a cloud system. We succeeded in acquiring continuous long-term data on the vital signs of employees during telework using this system. The analysis of the data revealed a strong correlation between behavior and stress.
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Affiliation(s)
- Yoshiro Tajitsu
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita Osaka 564-8680, Japan; (J.T.); (K.T.); (R.N.); (H.Y.); (S.S.); (I.N.); (I.K.); (T.N.)
| | - Jun Takarada
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita Osaka 564-8680, Japan; (J.T.); (K.T.); (R.N.); (H.Y.); (S.S.); (I.N.); (I.K.); (T.N.)
| | - Kohei Takatani
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita Osaka 564-8680, Japan; (J.T.); (K.T.); (R.N.); (H.Y.); (S.S.); (I.N.); (I.K.); (T.N.)
| | - Riku Nakanishi
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita Osaka 564-8680, Japan; (J.T.); (K.T.); (R.N.); (H.Y.); (S.S.); (I.N.); (I.K.); (T.N.)
| | - Hiroki Yanagimoto
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita Osaka 564-8680, Japan; (J.T.); (K.T.); (R.N.); (H.Y.); (S.S.); (I.N.); (I.K.); (T.N.)
| | - Seita Shiomi
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita Osaka 564-8680, Japan; (J.T.); (K.T.); (R.N.); (H.Y.); (S.S.); (I.N.); (I.K.); (T.N.)
| | - Isamu Nakagawa
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita Osaka 564-8680, Japan; (J.T.); (K.T.); (R.N.); (H.Y.); (S.S.); (I.N.); (I.K.); (T.N.)
| | - Ikuo Kawahara
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita Osaka 564-8680, Japan; (J.T.); (K.T.); (R.N.); (H.Y.); (S.S.); (I.N.); (I.K.); (T.N.)
| | - Takuo Nakiri
- Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, Suita Osaka 564-8680, Japan; (J.T.); (K.T.); (R.N.); (H.Y.); (S.S.); (I.N.); (I.K.); (T.N.)
| | - Saki Shimda
- Nishikawa Co., Ltd., Chuo, Tokyo 103-0006, Japan; (S.S.); (Y.S.); (T.N.); (K.K.)
| | - Yoji Shimura
- Nishikawa Co., Ltd., Chuo, Tokyo 103-0006, Japan; (S.S.); (Y.S.); (T.N.); (K.K.)
| | - Takuto Nonomura
- Nishikawa Co., Ltd., Chuo, Tokyo 103-0006, Japan; (S.S.); (Y.S.); (T.N.); (K.K.)
| | - Kazunori Kojima
- Nishikawa Co., Ltd., Chuo, Tokyo 103-0006, Japan; (S.S.); (Y.S.); (T.N.); (K.K.)
| | - Atsuhisa Ikeguch
- SoftBank Corp., Information Technology Division, Minato, Tokyo 105-7529, Japan; (A.I.); (K.O.); (T.S.); (Y.M.)
| | - Kazuhiro Okayama
- SoftBank Corp., Information Technology Division, Minato, Tokyo 105-7529, Japan; (A.I.); (K.O.); (T.S.); (Y.M.)
| | - Tomohiro Sakai
- SoftBank Corp., Information Technology Division, Minato, Tokyo 105-7529, Japan; (A.I.); (K.O.); (T.S.); (Y.M.)
| | - Yuichi Morioka
- SoftBank Corp., Information Technology Division, Minato, Tokyo 105-7529, Japan; (A.I.); (K.O.); (T.S.); (Y.M.)
| | | | | | - Rei Nisho
- Teijin Frontier Co., Ltd., Kita, Osaka 530-8605, Japan; (R.N.); (K.T.)
| | - Koji Takeshita
- Teijin Frontier Co., Ltd., Kita, Osaka 530-8605, Japan; (R.N.); (K.T.)
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14
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Koikawa N, Takami Y, Kawasaki Y, Kawana F, Shiroshita N, Ogasawara E, Kasai T. Changes in the objective measures of sleep between the initial nights of menses and the nights during the midfollicular phase of the menstrual cycle in collegiate female athletes. J Clin Sleep Med 2021; 16:1745-1751. [PMID: 32666918 DOI: 10.5664/jcsm.8692] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES Sleep is an important recovery period for athletes. Women, including athletes, have reported sleep disturbances around menses. Thus, the aim of this study was to assess the changes in objective sleep parameters in the nights during menses and in the midfollicular phase of the menstrual cycle of young female athletes. METHODS Female collegiate athletes with regular menstrual cycles were recruited. The participants underwent home electroencephalogram monitoring during the first and second nights after the onset of menses (M1 and M2, respectively) and during one night between the 7th and the 10th night after menses onset (midfollicular phase). RESULTS Data from 45 athletes were analyzed. The total sleep time was significantly reduced, and sleep onset latency was significantly prolonged in M2 compared with those in the night during the midfollicular phase. Sleep efficiency was significantly reduced in M1 compared with that in the night during the midfollicular phase. Changes in the percentage of deep sleep across menstrual cycles differed among the participants with and without menstrual symptoms or concerns for sanitary products; moreover, such participants spent a lower percentage of time in deep sleep in M1 compared with the other nights. CONCLUSIONS Collegiate female athletes with regular menstrual cycles are likely to have trouble falling asleep, tend to sleep less, and when concerned about sanitary products, have less deep sleep during menses. Even in young female athletes with regular menstrual cycles, sleep can be disturbed during menses. Interventions to restore or improve sleep should be considered.
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Affiliation(s)
- Natsue Koikawa
- Japanese Center for Research on Women in Sports, Juntendo University, Tokyo, Japan.,Graduate School of Health and Sports Science, Juntendo University, Chiba, Japan
| | - Yukiko Takami
- Graduate School of Health and Sports Science, Juntendo University, Chiba, Japan
| | - Yu Kawasaki
- Department of Obstetrics and Gynecology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Fusae Kawana
- Cardiovascular Respiratory Sleep Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Nanako Shiroshita
- Cardiovascular Respiratory Sleep Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Cardiovascular Management and Remote Monitoring, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Etsuko Ogasawara
- Japanese Center for Research on Women in Sports, Juntendo University, Tokyo, Japan.,Graduate School of Health and Sports Science, Juntendo University, Chiba, Japan
| | - Takatoshi Kasai
- Cardiovascular Respiratory Sleep Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Cardiovascular Management and Remote Monitoring, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Sleep and Sleep-Disordered Breathing Center, Juntendo University Hospital, Tokyo, Japan
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15
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Abstract
Despite the increasing awareness of the importance of sleep, the number of people suffering from insufficient sleep has increased every year. The gold-standard sleep assessment uses polysomnography (PSG) with various sensors to identify sleep patterns and disorders. However, due to the high cost of PSG and limited availability, many people with sleep disorders are left undiagnosed. Recent wearable sensors and electronics enable portable, continuous monitoring of sleep at home, overcoming the limitations of PSG. This report reviews the advances in wearable sensors, miniaturized electronics, and system packaging for home sleep monitoring. New devices available in the market and systems are collectively summarized based on their overall structure, form factor, materials, and sleep assessment method. It is expected that this review provides a comprehensive view of newly developed technologies and broad insights on wearable sensors and portable electronics toward advanced sleep monitoring as well as at-home sleep assessment.
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Affiliation(s)
- Shinjae Kwon
- George W. Woodruff School of Mechanical Engineering, Center for Human-Centric Interfaces and Engineering at the Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Hojoong Kim
- George W. Woodruff School of Mechanical Engineering, Center for Human-Centric Interfaces and Engineering at the Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Woon-Hong Yeo
- George W. Woodruff School of Mechanical Engineering, Center for Human-Centric Interfaces and Engineering at the Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, GA 30332, USA
- Wallace H. Coulter Department of Biomedical Engineering, Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology and Emory University, Atlanta, GA 30332, USA
- Neural Engineering Center, Flexible and Wearable Electronics Advanced Research, Institute for Materials, Institute for Robotics and Intelligent Machines, Georgia Institute of Technology, Atlanta, GA, USA
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16
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Abe T, Mishima K, Kitamura S, Hida A, Inoue Y, Mizuno K, Kaida K, Nakazaki K, Motomura Y, Maruo K, Ohta T, Furukawa S, Dinges DF, Ogata K. Tracking intermediate performance of vigilant attention using multiple eye metrics. Sleep 2021; 43:5733056. [PMID: 32040590 DOI: 10.1093/sleep/zsz219] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 07/01/2019] [Indexed: 11/14/2022] Open
Abstract
Vigilance deficits account for a substantial number of accidents and errors. Current techniques to detect vigilance impairment measure only the most severe level evident in eyelid closure and falling asleep, which is often too late to avoid an accident or error. The present study sought to identify ocular biometrics of intermediate impairment of vigilance and develop a new technique that could detect a range of deficits in vigilant attention (VA). Sixteen healthy adults performed well-validated Psychomotor Vigilance Test (PVT) for tracking vigilance attention while undergoing simultaneous recording of eye metrics every 2 hours during 38 hours of continuous wakefulness. A novel marker was found that measured VA when the eyes were open-the prevalence of microsaccades. Notably, the prevalence of microsaccades decreased in response to sleep deprivation and time-on-task. In addition, a novel algorithm for detecting multilevel VA was developed, which estimated performance on the PVT by integrating the novel marker with other eye-related indices. The novel algorithm also tracked changes in intermediate level of VA (specific reaction times in the PVT, i.e. 300-500 ms) during prolonged time-on-task and sleep deprivation, which had not been tracked previously by conventional techniques. The implication of the findings is that this novel algorithm, named "eye-metrical estimation version of the PVT: PVT-E," can be used to reduce human-error-related accidents caused by vigilance impairment even when its level is intermediate.
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Affiliation(s)
- Takashi Abe
- Astronaut and Operation Control Unit, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, Tsukuba, Ibaraki, Japan.,International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki, Japan.,Department of Sleep-Wake Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Kazuo Mishima
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, Tsukuba, Ibaraki, Japan.,Department of Sleep-Wake Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan.,Department of Neuropsychiatry, Akita University Graduate School of Medicine, Akita-city, Akita, Japan
| | - Shingo Kitamura
- Department of Sleep-Wake Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Akiko Hida
- Department of Sleep-Wake Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Yuichi Inoue
- Department of Somnology, Tokyo Medical University, Shinjuku-Ku, Tokyo, Japan
| | - Koh Mizuno
- Astronaut and Operation Control Unit, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, Tsukuba, Ibaraki, Japan.,Faculty of Education, Tohoku Fukushi University, Sendai, Miyagi, Japan
| | - Kosuke Kaida
- Automotive Human Factors Research Center, Department of Information Technology and Human Factors, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan
| | - Kyoko Nakazaki
- Department of Sleep-Wake Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Yuki Motomura
- Department of Sleep-Wake Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan.,Department of Human Science, Faculty of Design, Kyushu University, Minami-Ku, Fukuoka, Japan
| | - Kazushi Maruo
- Department of Biostatistics, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Toshiko Ohta
- Astronaut and Operation Control Unit, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, Tsukuba, Ibaraki, Japan
| | - Satoshi Furukawa
- Astronaut and Operation Control Unit, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, Tsukuba, Ibaraki, Japan
| | - David F Dinges
- Division of Sleep and Chronobiology, Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | - Katsuhiko Ogata
- Astronaut and Operation Control Unit, Human Spaceflight Technology Directorate, Japan Aerospace Exploration Agency, Tsukuba, Ibaraki, Japan
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Shirota A, Kamimura M, Kishi A, Adachi H, Taniike M, Kato T. Discrepancies in the Time Course of Sleep Stage Dynamics, Electroencephalographic Activity and Heart Rate Variability Over Sleep Cycles in the Adaptation Night in Healthy Young Adults. Front Physiol 2021; 12:623401. [PMID: 33867997 PMCID: PMC8044772 DOI: 10.3389/fphys.2021.623401] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 02/12/2021] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVE The aim of the present study was to characterize the cyclic sleep processes of sleep-stage dynamics, cortical activity, and heart rate variability during sleep in the adaptation night in healthy young adults. METHODS Seventy-four healthy adults participated in polysomnographic recordings on two consecutive nights. Conventional sleep variables were assessed according to standard criteria. Sleep-stage continuity and dynamics were evaluated by sleep runs and transitions, respectively. These variables were compared between the two nights. Electroencephalographic and cardiac activities were subjected to frequency domain analyses. Cycle-by-cycle analysis was performed for the above variables in 34 subjects with four sleep cycles and compared between the two nights. RESULTS Conventional sleep variables reflected lower sleep quality in the adaptation night than in the experimental night. Bouts of stage N1 and stage N2 were shorter, and bouts of stage Wake were longer in the adaptation night than in the experimental night, but there was no difference in stage N3 or stage REM. The normalized transition probability from stage N2 to stage N1 was higher and that from stage N2 to N3 was lower in the adaptation night, whereas that from stage N3 to other stages did not differ between the nights. Cycle-by-cycle analysis revealed that sleep-stage distribution and cortical beta EEG power differed between the two nights in the first sleep cycle. However, the HF amplitude of the heart rate variability was lower over the four sleep cycles in the adaptation night than in the experimental night. CONCLUSION The results suggest the distinct vulnerability of the autonomic adaptation processes within the central nervous system in young healthy subjects while sleeping in a sleep laboratory for the first time.
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Affiliation(s)
- Ai Shirota
- Department of Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
| | - Mayo Kamimura
- Department of Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
| | - Akifumi Kishi
- Graduate School of Education, The University of Tokyo, Bunkyo-ku, Japan
| | - Hiroyoshi Adachi
- Osaka University Hospital, Sleep Medicine Center, Suita, Japan
- Osaka University Health and Counseling Center, Toyonaka, Japan
| | - Masako Taniike
- Osaka University Hospital, Sleep Medicine Center, Suita, Japan
- Department of Child Development, Osaka University United Graduate School of Child Development, Suita, Japan
| | - Takafumi Kato
- Department of Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
- Osaka University Hospital, Sleep Medicine Center, Suita, Japan
- Department of Child Development, Osaka University United Graduate School of Child Development, Suita, Japan
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18
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Torimoto K, Miyake M, Nakai Y, Aoki K, Tanaka N, Fujimoto K. Rationale, design, and methods of electroencephalography-based investigation of the effects of oral desmopressin on improving slow-wave sleep time in nocturnal polyuria patients (the DISTINCT study): protocol for a single-arm, open-label, single-assignment trial. BMC Urol 2020; 20:96. [PMID: 32652972 PMCID: PMC7353714 DOI: 10.1186/s12894-020-00668-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 07/06/2020] [Indexed: 12/02/2022] Open
Abstract
Background Nocturia is one of the most bothersome lower urinary tract symptoms and often impairs sleep quality in the elderly. Although previous studies on nocturia have indicated that the successful treatment of nocturia improves sleep quality, most used questionnaires and activity devices to analyze sleep/wake patterns. Therefore, there is little information about the treatment effects of desmopressin on objective sleep quality. The aim of the DISTINCT study is to investigate the change in subjective and objective sleep quality using electroencephalography (EEG) and the Pittsburgh Sleep Quality Index (PSQI) after the administration of desmopressin in patients with nocturia due to nocturnal polyuria. Methods A total of 20 male patients, ≥65 years old, with nocturnal polyuria, defined as a nocturnal polyuria index (NPi) (nocturnal urine volume / 24 h urine volume) value ≥0.33, will participate in this study. The participants must have a nocturnal frequency of ≥2 and the first uninterrupted sleep period (FUSP) must occur within < 2.5 h. Desmopressin 50 μg per day will be orally administered before going to bed for 4 weeks. Urinary frequency volume charts (FVC) and EEG will be recorded prior to treatment and at 1 week and 4 weeks after the initiation of treatment. The PSQI will be completed before and 4 weeks after treatment. The primary endpoint is the change from baseline in the mean time of slow-wave sleep (sleep stages N3 and N4) at 4 weeks. The secondary endpoints include the change in the mean value of each sleep variable, the mean delta power during the FUSP, the correlation between nocturnal urinary frequency and slow-wave sleep time, and the change in PSQI score before and after treatment. Discussion The DISTINCT study will provide valuable evidence to indicate that oral desmopressin treatment for nocturnal polyuria prolongs the FUSP, resulting in the extension of slow-wave sleep time associated with sleep quality. Trial registration The Japan Registry of Clinical Trials (jRCTs051190080). Registered 9 December, 2019.
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Affiliation(s)
- Kazumasa Torimoto
- Department of Urology, Nara Medical University, 840 Shijocho, Kashihara, Nara, 634-8522, Japan.
| | - Makito Miyake
- Department of Urology, Nara Medical University, 840 Shijocho, Kashihara, Nara, 634-8522, Japan
| | - Yasushi Nakai
- Department of Urology, Nara Medical University, 840 Shijocho, Kashihara, Nara, 634-8522, Japan
| | - Katsuya Aoki
- Department of Urology, Nara Medical University, 840 Shijocho, Kashihara, Nara, 634-8522, Japan
| | - Nobumichi Tanaka
- Department of Urology, Nara Medical University, 840 Shijocho, Kashihara, Nara, 634-8522, Japan
| | - Kiyohide Fujimoto
- Department of Urology, Nara Medical University, 840 Shijocho, Kashihara, Nara, 634-8522, Japan
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19
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Evaluation of Sleep Quality in a Disaster Evacuee Environment. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17124252. [PMID: 32549208 PMCID: PMC7345554 DOI: 10.3390/ijerph17124252] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 06/11/2020] [Indexed: 11/23/2022]
Abstract
We aimed to evaluate sleep and sleep-related physiological parameters (heart rate variability and glucose dynamics) among evacuees by experimentally recreating the sleep environment of evacuation shelters and cars. Nine healthy young male subjects participated in this study. Two interventions, modeling the sleep environments of evacuation shelters (evacuation shelter trial) and car seats (car trial), were compared with sleep at home (control trial). Physiological data were measured using portable two-channel electroencephalogram and electrooculogram monitoring systems, wearable heart rate sensors, and flash glucose monitors. Wake after sleep onset (WASO) and stage shift were greater in both intervention trials than the control trial, while rapid-eye movement (REM) latency and non-rapid eye movement (NREM) 1 were longer and REM duration was shorter in the evacuation shelter trial than the control trial. Glucose dynamics and power at low frequency (LF.p) of heart rate variability were higher in the car trial than in the control trial. It was confirmed that sleep environment was important to maintain sleep, and affected glucose dynamics and heart rate variability in the experimental situation.
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Warm Steam Inhalation before Bedtime Improved Sleep Quality in Adult Men. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2019; 2019:2453483. [PMID: 31534462 PMCID: PMC6732600 DOI: 10.1155/2019/2453483] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 07/31/2019] [Accepted: 08/13/2019] [Indexed: 12/19/2022]
Abstract
In humans, the inhalation of warm steam has been reported to decrease the respiratory rate. However, the effects of warm steam inhalation on sleep have not been studied closely. This study aimed to examine the effects of warm steam inhalation before bedtime on subsequent sleep quality. The participants included 17 adult men with mild sleep difficulties and anxiety. All experiments were conducted in the participants' homes. The participants were instructed to wear a warm steam-generating mask or sham mask over the nose and mouth for 15 minutes immediately before habitual bedtime and were then allowed to sleep until their habitual waking time. The functional mask provided approximately 600 mg of steam for 10 minutes and maintained an interior temperature of 38-40°C for 15 minutes. We evaluated the participants' electrocardiograms and subjective moods while wearing the mask. During sleep, electroencephalograms (EEGs) were recorded using a single-channel portable device. In the morning, each participant was instructed to report their sleep details subjectively using a visual analog scale. At bedtime, the subjects' subjective apprehension of the next day was reduced significantly under steam inhalation, compared with the sham condition. Compared to the sham condition, steam inhalation before bedtime was associated with a higher EEG delta power density during the first third of sleep episodes and better subjective sleep quality in the morning. These results suggest that safe and easy inhalation of warm steam via a steam-generating mask improves psychological relaxation and sleep.
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Nochino T, Ohno Y, Kato T, Taniike M, Okada S. Sleep stage estimation method using a camera for home use. Biomed Eng Lett 2019; 9:257-265. [PMID: 31168430 PMCID: PMC6520421 DOI: 10.1007/s13534-019-00108-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Revised: 03/29/2019] [Accepted: 04/01/2019] [Indexed: 10/26/2022] Open
Abstract
Recent studies have developed simple techniques for monitoring and assessing sleep. However, several issues remain to be solved for example high-cost sensor and algorithm as a home-use device. In this study, we aimed to develop an inexpensive and simple sleep monitoring system using a camera and video processing. Polysomnography (PSG) recordings were performed in six subjects for four consecutive nights. Subjects' body movements were simultaneously recorded by the web camera. Body movement was extracted by video processing from the video data and five parameters were calculated for machine learning. Four sleep stages (WAKE, LIGHT, DEEP and REM) were estimated by applying these five parameters to a support vector machine. The overall estimation accuracy was 70.3 ± 11.3% with the highest accuracy for DEEP (82.8 ± 4.7%) and the lowest for LIGHT (53.0 ± 4.0%) compared with correct sleep stages manually scored on PSG data by a sleep technician. Estimation accuracy for REM sleep was 68.0 ± 6.8%. The kappa was 0.19 ± 0.04 for all subjects. The present non-contact sleep monitoring system showed sufficient accuracy in sleep stage estimation with REM sleep detection being accomplished. Low-cost computing power of this system can be advantageous for mobile application and modularization into home-device.
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Affiliation(s)
- Teruaki Nochino
- Division of Health Sciences, Osaka University Graduation School of Medicine, 1-7, Yamadaoka, Suita, Osaka 565-0871 Japan
| | - Yuko Ohno
- Division of Health Sciences, Osaka University Graduation School of Medicine, 1-7, Yamadaoka, Suita, Osaka 565-0871 Japan
| | - Takafumi Kato
- Department of Oral Physiology, Osaka University Graduation School of Density, 1-8, Yamadaoka, Suita, Osaka 565-0871 Japan
| | - Masako Taniike
- United Graduate School of Child Development, Osaka University, 2-2 Yamadaoka, Suita, Osaka Japan
| | - Shima Okada
- Ritsumeikan University, College of Science Engineering, 1-1-1, Noji-higashi, Kusatsu, Shiga 525-8577 Japan
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Gorlova S, Ichiba T, Nishimaru H, Takamura Y, Matsumoto J, Hori E, Nagashima Y, Tatsuse T, Ono T, Nishijo H. Non-restorative Sleep Caused by Autonomic and Electroencephalography Parameter Dysfunction Leads to Subjective Fatigue at Wake Time in Shift Workers. Front Neurol 2019; 10:66. [PMID: 30804882 PMCID: PMC6370690 DOI: 10.3389/fneur.2019.00066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Accepted: 01/17/2019] [Indexed: 01/06/2023] Open
Abstract
Sleep is a physiological state that plays important role in the recovery of fatigue. However, the relationship between the physiological status of sleep and subjective fatigue remains unknown. In the present study, we hypothesized that the non-recovery of fatigue at wake time due to non-restorative sleep might be ascribed to changes in specific parameters of electroencephalography (EEG) and heart rate variability (HRV) in poor sleepers. Twenty healthy female shift-working nurses participated in the study. Subjective fatigue was assessed using the visual analog scale (VAS) at bedtime and wake time. During sleep on the night between 2 consecutive day shifts, the EEG powers at the frontal pole, HRV based on electrocardiograms, and distal-proximal gradient of skin temperature were recorded and analyzed. The results indicated that the subjects with high fatigue on the VAS at wake time exhibited (1) a decrease in deep non-rapid eye movement (NREM) (stageN3) sleep duration in the first sleep cycle; (2) a decrease in REM latency; (3) a decrease in ultra-slow and delta EEG powers, particularly from 30 to 65 min after sleep onset; (4) a decrease in the total power of HRV, particularly from 0 to 30 min after sleep onset; (5) an increase in the very low frequency component of HRV; and (6) a smaller increase in the distal-proximal gradient of skin temperature, than those of the subjects with low fatigue levels. The correlational and structural equation modeling analyses of these parameters suggested that an initial decrease in the total power of HRV from 0 to 30 min after sleep onset might inhibit the recovery from fatigue during sleep (i.e., increase the VAS score at wake time) via its effects on the ultra-slow and delta powers from 30 to 65 min after sleep onset, stageN3 duration in the first sleep cycle, REM latency, and distal-proximal gradient of skin temperature. These findings suggest an important role of these physiological factors in recovery from fatigue during sleep, and that interventions to modify these physiological factors might ameliorate fatigue at wake time.
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Affiliation(s)
- Sofya Gorlova
- System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | | | - Hiroshi Nishimaru
- System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Yusaku Takamura
- System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Jumpei Matsumoto
- System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Etsuro Hori
- System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | | | - Tsuyoshi Tatsuse
- Department of Epidemiology and Health Policy, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Taketoshi Ono
- System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Hisao Nishijo
- System Emotional Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
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Park KS, Choi SH. Smart technologies toward sleep monitoring at home. Biomed Eng Lett 2019; 9:73-85. [PMID: 30956881 PMCID: PMC6431329 DOI: 10.1007/s13534-018-0091-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 12/05/2018] [Accepted: 12/07/2018] [Indexed: 01/19/2023] Open
Abstract
With progress in sensors and communication technologies, the range of sleep monitoring is extending from professional clinics into our usual home environments. Information from conventional overnight polysomnographic recordings can be derived from much simpler devices and methods. The gold standard of sleep monitoring is laboratory polysomnography, which classifies brain states based mainly on EEGs. Single-channel EEGs have been used for sleep stage scoring with accuracies of 84.9%. Actigraphy can estimate sleep efficiency with an accuracy of 86.0%. Sleep scoring based on respiratory dynamics provides accuracies of 89.2% and 70.9% for identifying sleep stages and sleep efficiency, respectively, and a correlation coefficient of 0.94 for apnea-hypopnea detection. Modulation of autonomic balance during the sleep stages are well recognized and widely used for simpler sleep scoring and sleep parameter estimation. This modulation can be recorded by several types of cardiovascular measurements, including ECG, PPG, BCG, and PAT, and the results showed accuracies up to 96.5% and 92.5% for sleep efficiency and OSA severity detection, respectively. Instead of using recordings for the entire night, less than 5 min ECG recordings have used for sleep efficiency and AHI estimation and resulted in high correlations of 0.94 and 0.99, respectively. These methods are based on their own models that relate sleep dynamics with a limited number of biological signals. Parameters representing sleep quality and disturbed breathing are estimated with high accuracies that are close to the results obtained by polysomnography. These unconstrained technologies, making sleep monitoring easier and simpler, will enhance qualities of life by expanding the range of ubiquitous healthcare.
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Affiliation(s)
- Kwang Suk Park
- Department of Biomedical Engineering, College of Medicine, Seoul National University, Seoul, 03080 Korea
- Interdisciplinary Program in Bioengineering, Seoul National University, Seoul, 08826 Korea
- Institute of Medical and Biological Engineering, Medical Research Center, Seoul National University, Seoul, 03080 Korea
| | - Sang Ho Choi
- Interdisciplinary Program in Bioengineering, Seoul National University, Seoul, 08826 Korea
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