• 한국콘텐츠학회논문지
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• 제21권2호
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• pp.140-147
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• 2021

다양한 수면검사에서 수면단계를 정확히 판단하기 위해 뇌파를 측정한다. 일반적으로 측정은 센서 채널의 개수가 늘어날수록 정확도가 높아지지만, 뇌파는 측정할 때 피부에 전극을 부착하여 수면을 방해하는 요소로 작용한다. 일상생활에서 자가 수면케어를 할 때는 사용자의 불편함과 측정데이터의 정확도를 모두 고려한 최소한의 뇌파 채널 개수를 선택할 필요가 있다. 따라서 본 논문에서는 1개의 채널부터 4개의 채널에 대한 수면단계 분석 모델을 제작하여 1채널은 82.28%, 2채널은 85.77%, 3채널은 80.33%, 4채널은 68.87%의 정확도를 확인했다. 본 연구 결과는 측정 부위가 제한적이라는 한계가 있지만, 채널 개수에 따른 정확도를 비교하여 뇌파 기반 수면분석에서 채널 개수 선정에 대한 정보를 제공한다.

• 수면정신생리
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• 제4권1호
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• pp.49-56
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• 1997

Nocturnal panic involves sudden awakening from sleep in a state of panic characterized by various somatic sensation of sympathetic arousal and intense fear. Many(18-71%) of the spontaneous panic attacks tend to occur from a sleeping state unrelated to the situational and cognitive context. Nocturnal panickers experienced daytime panics and general somatic sensation more frequently than other panickers. Despite frequent distressing symptoms, these patients tend to exhibit little social or occupational impairment and minimal agoraphobia and have a high lifetime incidence of major depression and a good response to tricyclic antidepressants. Sleep panic attacks arise from non-REM sleep, late stage 2 or early stage 3. The pathophysiology and the similarity of nocturnal panic to sleep apnea, dream-induced anxiety attacks, night terrors, sleep paralysis, and temporal lobe epilepsy are discussed.

• 설비공학논문집
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• 제19권4호
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• pp.307-312
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• 2007

This study was performed to evaluate sleep efficiencies and conditions for comfortable sleep based on the analysis of sleep efficiency and MST under four thermals conditions ($22^{\circ}C,\;24^{\circ}C,\;26^{\circ}C,\;30^{\circ}C$). Five female subjects who have similar life cycle and sleep patterns were participated for the sleep experiment. Their age was from 20 to 22 years old. They were healthy, and had regular sleep with consistent bed and wakeup time. It was checked whether they had a good sleep before the night of experiment. Experiments were performed in an environmental chamber using thermo-hygrostat. The physiological signal (EEG) for sleep stage were obtained from C3-A2 and C4-Al electrode sites. Sleep stages were classified, then SWS latency and SWS/TST were calculated for the evaluation for sleep efficiencies on thermal conditions. As results, mean skin temperature for comfort sleeping was $34.5{\sim}35.4^{\circ}C$. Considering sleep efficiency and mean skin temperature, indoor room temperature of upper limit was $28.1^{\circ}C$.

• Clinics in Shoulder and Elbow
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• 제26권2호
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• pp.169-174
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• 2023

Background: Sleep quality, quantity, and efficiency have all been demonstrated to be adversely affected by rotator cuff pathology. Previous measures of assessing the impact of rotator cuff pathology on sleep have been largely subjective in nature. This study was undertaken to objectively analyze this relationship through the use of activity monitors. Methods: Patients with full-thickness rotator cuff tears at a single institution were prospectively enrolled between 2018 and 2020. Waist-worn accelerometers were provided for the patients to use each night for 14 days. Sleep efficiency was calculated using the ratio of the time spent sleeping to the total amount of time that was spent in bed. Retraction of the rotator cuff tear was classified using the Patte staging system. Results: This study included 36 patients: 18 with Patte stage 1 disease, 14 with Patte stage 2 disease, and 4 patients with Patte stage 3 disease. During the study, 25 participants wore the monitor on multiple nights, and ultimately their data was used for the analysis. No difference in the median sleep efficiency was appreciated amongst these groups (P>0.1), with each cohort of patients demonstrating a generally high sleep efficiency. Conclusions: The severity of retraction of the rotator cuff tear did not appear to correlate with changes in sleep efficiency for patients (P>0.1). These findings can better inform providers on how to counsel their patients who present with complaints of poor sleep in the setting of full-thickness rotator cuff tears.

• 생명과학회지
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• 제12권4호
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• pp.375-382
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• 2002

운동이 수면에 미치는 효과를 보다 명확하게 검증하기 위해 일반상태가 아닌 카페인으로 인한 수면장애 상태에서 운동의 효과를 조사하였다. 본 연구의 피험자는 3회의 실험 조건(1. 평상시, 2. 카페인 섭취, 3. 카페인섭취 $\times$운동)에 참여해서 이들의 수면변수와 수면시 뇌파를 측정하였다. 카페인은 고용량으로 1200mg(400mg$\times$3)을 투여하였으며, 운동강도는 60% V $O_{2peak}$에서 60분을 사이클 에르고미터를 이용해 실시하였다. 본 실험결과 카페인 섭취로 입면시간 연장과 수면효율성 감소 그리고 서파수면(SWS)의 감소로 수면에 불리한 효과를 유발시켰다. 하지만 카페인 섭취와 운동을 병행했을 때 카페인 투여시 발생된 효과를 상쇄시키는 효과가 나타났다. 이러한 결과로써 고용량의 카페인 섭취가 수면장애 유발 효과가 있었지만 운동을 병행해서 실시했을 때 수면촉진과 수면효율성 그리고 숙면인 서파수면의 증가가 나타남으로써 운동이 수면방해를 완화시키고 수면 향상에 효과가 있는 것으로 생각된다.

• 정신신체의학
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• 제31권2호
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• pp.149-154
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• 2023

Objectives : Far-infrared (FIR) lights have been investigated for sleep quality intervention. We sought to measure the advantageous effects of FIR in sleep using polysomnographic data as the objective outcomes. Methods : The ten healthy volunteers were enrolled in a single-center, prospective, patient-blind, single-arm trial. Individuals slept on a sham mattress and a FIR emitting mattress with polysomnography for one night each. Results : Sleep efficiency showed an increasing trend but was not statistically significant. PSQI-K significantly decreased (p=0.013). The latency to REM of the baseline was shorter than that of the intervention (p=0.008). Though there was no statistical significance, Stage N1 and N2 were shortened, and Stage N3 was prolonged after the intervention compared to the baseline. Conclusions : The FIR-emitting mattresses improved sleep quality on self-reported insomnia. We suggested the candidate for the markers altered by the FIR therapy, such as the normalization of REM latency and increased N3 sleep.

• Annals of Clinical Neurophysiology
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• 제17권1호
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• pp.17-23
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• 2015

Background: Sleep-related disturbances and sleep disorders are common in Parkinson's disease (PD) and have a great impact on daily life of PD patients. This study was done to find the sleep characteristics and sleep disturbing factors in PD patients according to disease severity through clinical interview and polysomnographic (PSG) study. Methods: Fifty patients with PD (22 males, age $60.6{\pm}6.4$, Hoehn and Yahr (HY) stage $2.7{\pm}1.0$) were recruited and thoroughly interviewed about their sleep. PSG was performed on the patients taking routine antiparkinsonian medications. Patients were grouped into mild and moderate/severe group according to HY stage, and the results were compared between each group. Results: Ninety-four percent of total patients had one or more sleep-related disturbances based on the interview or PSG. On interview, the moderate/severe group complained more insomnia and REM sleep behavior disorder (RBD) than mild group. In PSG findings, the moderate/severe group showed lower sleep efficiency, longer sleep latency, REM sleep latency, waking time after sleep onset, and higher prevalence of RBD. Conclusions: In this study, most patients with PD had sleep disturbances. Clinical interview and PSG findings revealed deterioration of sleep quality along the disease severity. Our results suggest that sleep disturbances in PD patients are prevalent and warrant clinical attention, especially to the patients with advanced disease.

• 한국산업정보학회논문지
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• 제22권1호
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• pp.41-51
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• 2017

This Paper Describes a Method for the Evaluation of Sleep Apnea, Namely, the Peak Signal-to-noise ratio (PSNR) of Wavelet Transformed Electroencephalography (EEG) Data. The Purpose of this Study was to Investigate EEG Properties with Regard to Differences between Sleep Spindles and K-complexes and to Characterize Obstructive Sleep Apnea According to Sleep Stage. We Examined Non-REM and REM Sleep in 20 Patients with OSA and Established a New Approach for Detecting Sleep Apnea Base on EEG Frequency Changes According to Sleep Stage During Sleep Apnea Events. For Frequency Bands Corresponding to A3 Decomposition with a Sampling Applied to the KC and the Sleep Spindle Signal. In this Paper, the KC and Sleep Spindle are Ccalculated using MSE and PSNR for 4 Types of Mother Wavelets. Wavelet Transform Coefficients Were Obtained Around Sleep Spindles in Order to Identify the Frequency Information that Changed During Obstructive Sleep Apnea. We also Investigated Whether Quantification Analysis of EEG During Sleep Apnea is Valuable for Analyzing Sleep Spindles and The K-complexes in Patients. First, Decomposition of the EEG Signal from Feature Data was Carried out using 4 Different Types of Wavelets, Namely, Daubechies 3, Symlet 4, Biorthogonal 2.8, and Coiflet 3. We Compared the PSNR Accuracy for Each Wavelet Function and Found that Mother Wavelets Daubechies 3 and Biorthogonal 2.8 Surpassed the other Wavelet Functions in Performance. We have Attempted to Improve the Computing Efficiency as it Selects the most Suitable Wavelet Function that can be used for Sleep Spindle, K-complex Signal Processing Efficiently and Accurate Decision with Lesser Computational Time.

• 수면정신생리
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• 제9권1호
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• pp.9-13
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• 2002

Alzheimer's disease (AD) is one of the most common and devastating dementing disorders of old age. Most AD patients showed significant alternation of sleep structure as well as cognitive deficit. Typical findings of sleep architecture in AD patients include lower sleep efficiency, higher stage 1 percentage, and greater frequency of arousals. The slowing of EEG activity is also noted. Abnormalities in REM sleep are of particular interest in AD because the cholinergic system is related to both REM sleep and AD. Several parameters representing REM sleep structure such as REM latency, the amount of REM sleep, and REM density are change in patients with AD. Especially, measurements of EEG slowing during tonic REM sleep can be used as an EEG marker for early detection of possible AD. In addition, a structural defect in the suprachiasmatic nucleus is suggested to cause various chronobiological alternations in AD. Most of alternations related to sleep make sleep disturbances common and disruptive symptoms of AD. In this article, the author reviewed the alternation of sleep structure and circadian rhythm in AD patients.

• 수면정신생리
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• 제12권1호
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• pp.68-71
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• 2005

저자들은 렘수면에서만 주로 발생한 폐쇄성 수면무호흡증 1례를 경험하고 이를 보고하면서 그 의미를 고찰하고자 하였다. 증례는 55세 여자 환자였으며 수면클리닉에 와서 만성불면증을 호소하였다. 야간수면다원검사에서 호흡장애지수는 13.8, 혈중산소포화도가 90% 미만인 시간은 5.0%로 전반적으로는 경한 정도의 폐쇄성 수면무호흡증 소견을 보였다. 그러나 흥미롭게도 무호흡과 산소포화도저하가 주로 렘수면에서만 나타났고 렘수면단계에서만 산출한 호흡장애지수는 38.1, 그리고 혈중산소포화도의 저하소견도 더 심해져 90% 미만에 해당하는 시간의 비율이 13.9%로 중증의 수면무호흡증에 해당되었다. 이 증례에서 얻는 교훈은 다음과 같다. 첫째, 만성불면증의 일부에서는 폐쇄성 수면무호흡증을 앓고 있으며 야간수면 다원검사 없이는 단순한 불면증으로 오진할 가능성이 있다는 것이다. 둘째, 치료적 측면에서 렘수면 의존성인 폐쇄성수면무호흡증의 치료는 여러 수면단계에 걸쳐 나타나는 무호흡증의 치료와 달리 약물학적 치료, 특히 렘수면에 관여하는 약물을 이용한 치료법 개발의 좋은 모델이 될 가능성이 있다.