JP2003126052A - Sleep stage judgment method - Google Patents
Sleep stage judgment methodInfo
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- JP2003126052A JP2003126052A JP2001363435A JP2001363435A JP2003126052A JP 2003126052 A JP2003126052 A JP 2003126052A JP 2001363435 A JP2001363435 A JP 2001363435A JP 2001363435 A JP2001363435 A JP 2001363435A JP 2003126052 A JP2003126052 A JP 2003126052A
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- sleep stage
- sleep
- signals
- detected
- tube
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、睡眠段階の判定方
法に関するものであって、特に夜間の睡眠中の睡眠の深
さを被験者の身体に対して無侵襲な検出手段を用いるこ
とによって被験者の睡眠段階を判定する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining a sleep stage, and more particularly to a method for detecting the depth of sleep during sleep at night by using non-invasive detection means for the body of the subject. A method of determining a sleep stage.
【０００２】[0002]
【従来の技術】個人の健康管理の方法としては病院にお
いて定期的に検診を受ける等の方法があるが、数ヵ月に
１度程度の検診では身体の微妙な変化などの異常を見逃
してしまうことが多く、また精神的なストレスなどは検
診や問診などで発見することは困難である。2. Description of the Related Art As a method of managing individual health, there is a method such as having a medical examination regularly at a hospital. However, a medical examination once every several months may miss abnormalities such as subtle changes in the body. However, it is difficult to find mental stress through medical examinations and interviews.
【０００３】個人の健康具合について調べる際に、睡眠
をそのバロメーターとすることが多く、睡眠と健康とが
密接に関連していることはよく知られているところであ
る。健康と夜間の睡眠の深さおよびその質が翌日の気分
や気力と密接に関連しており、一方精神的なストレスや
体調が不良である場合には、眠りの深さや睡眠段階の推
移パターンに変化が起こり、快適な睡眠が得られない。In examining the health condition of an individual, sleep is often used as a barometer, and it is well known that sleep and health are closely related. Health and the depth and quality of sleep at night are closely related to mood and energy on the next day, while in the case of mental stress and poor physical condition, sleep depth and sleep stage transition patterns Changes occur and you cannot get comfortable sleep.
【０００４】健康な睡眠では、入眠した後にノンレム睡
眠段階レム睡眠段階とが一定の間隔で繰り返し現われる
が、体調を崩しているときや、精神的なストレスがかか
っているときには、そのリズムが乱れることが知られて
いる。したがって夜間の睡眠中の睡眠段階とその発生パ
ターンを監視することにより、被験者の精神的なストレ
スや体調の不良を知ることが可能になる。In healthy sleep, the non-REM sleep stage and the REM sleep stage appear repeatedly at regular intervals after falling asleep, but the rhythm is disturbed when the patient is sick or suffers mental stress. It has been known. Therefore, by monitoring the sleep stage during nighttime sleep and its occurrence pattern, it becomes possible to know the mental stress and poor physical condition of the subject.
【０００５】従来からある睡眠段階を知る方法として
は、睡眠ポリソムノグラフ（ＰＳＧ）を用いる方法が一
般的である。ＰＳＧを用いる方法では、睡眠中の脳神経
系の活動を脳波、表面筋電位、眼球運動等から推定して
睡眠に関する多くの情報を得ることができるが、被験者
の顔や身体に多くの電極を装着して測定を行うために、
自然な睡眠を得ることができるまで数日から１週間の日
時を要する。したがって被験者に与えられる身体的およ
び肉体的な負担は非常に大きなものであり、さらに、こ
れに要する費用も多額になる。As a conventional method for knowing the sleep stage, a method using a sleep polysomnograph (PSG) is generally used. In the method using PSG, much information about sleep can be obtained by estimating activity of the cranial nervous system during sleep from EEG, surface EMG, eye movement, etc., but many electrodes are attached to the face and body of the subject. In order to measure
It takes a few days to a week to get a natural sleep. Therefore, the physical and physical burden on the subject is very large, and the cost required for this is also large.
【０００６】このために、ＰＳＧは睡眠障害があること
が明らかな患者等に使用するのは有効な治療法に成りえ
ても、日常の健康管理に使用することは困難である。[0006] Therefore, although PSG can be an effective therapeutic method for patients who are known to have sleep disorders, it is difficult to use it for daily health management.
【０００７】[0007]
【発明が解決しようとする課題】被験者の日常の健康状
態を知るために睡眠の状態やその質を知ることが有効で
あることは判っているが、個人の健康管理の目的に簡単
に利用できる睡眠段階の検出装置は現在のところないの
が現状である。そこで本発明の目的は、被験者の身体に
無侵襲で、即ち肉体的および精神的な負担を被験者にか
けることなく、被験者の睡眠段階を測定できる方法およ
び装置を提供することを目的としている。Although it is known that it is effective to know the sleep state and the quality of sleep in order to know the daily health condition of the subject, it can be easily used for the purpose of personal health management. Currently, there is no sleep stage detection device. Therefore, it is an object of the present invention to provide a method and a device that can measure the sleep stage of a subject non-invasively to the subject's body, that is, without subjecting the subject to physical and mental burdens.
【０００８】[0008]
【課題を解決するための手段】第１の発明は、無侵襲セ
ンサで検出した生体信号から心拍信号を検出し、この心
拍信号から睡眠段階を判定する睡眠段階判定方法であっ
て、心拍信号から検出したＲ−Ｒ間隔信号にフーリエ変
換を施してパワースペクトル密度を求め、このパワース
ペクトル密度の極大値から睡眠段階を判定することを特
徴とする。A first invention is a sleep stage determining method for detecting a heartbeat signal from a biological signal detected by a non-invasive sensor and determining a sleep stage from the heartbeat signal. The detected RR interval signal is subjected to Fourier transform to obtain a power spectrum density, and the sleep stage is determined from the maximum value of the power spectrum density.
【０００９】第２の発明は、第１の発明の睡眠段階判定
方法であって、パワースペクトル密度の高周波成分の極
大値と低周波成分の極大値とから睡眠段階を判定するこ
とを特徴とする請求項１に記載の睡眠段階判定方法。A second aspect of the invention is the sleep stage determination method according to the first aspect of the invention, wherein the sleep stage is determined from the maximum value of the high frequency component and the maximum value of the low frequency component of the power spectrum density. The sleep stage determination method according to claim 1.
【００１０】第３の発明は、第１の発明の睡眠段階判定
方法であって、無侵襲センサは、チューブとチューブ内
の圧力変化を検出する微差圧センサとからなり、微差圧
センサにより検出したチューブ内の圧力変化信号から心
拍信号を検出することを特徴とするA third aspect of the present invention is the sleep stage determining method according to the first aspect of the present invention, in which the non-invasive sensor includes a tube and a fine differential pressure sensor for detecting a pressure change in the tube. Characterized by detecting a heartbeat signal from the detected pressure change signal in the tube
【００１１】[0011]
【作用】本発明の睡眠段階判定方法は、無侵襲な検出手
段を用いて心拍信号を検出し、この心拍信号を演算処理
することにより被験者の睡眠段階を判定するものであ
り、被験者に測定用の電極などを装着する必要がないの
で、被験者に身体的および精神的な負担をかけることな
く日常的に採用することが可能となる。The sleep stage determination method of the present invention is to determine a sleep stage of a subject by detecting a heartbeat signal by using a non-invasive detecting means and calculating the heartbeat signal. Since it is not necessary to wear the electrodes and the like, it is possible to employ the subject on a daily basis without imposing a physical or mental burden on the subject.
【００１２】また、心拍信号から検出したＲ−Ｒ間隔信
号から求めたパワースペクトル密度は、自律神経の状態
を示す良好な指標であるために、睡眠時の睡眠段階の指
標にもなると考えられる。したがって、睡眠時の自律神
経の活動から睡眠段階を判定する本発明の睡眠段階判定
方法は、高い信頼性を備えている。Since the power spectrum density obtained from the RR interval signal detected from the heartbeat signal is a good index showing the state of the autonomic nerve, it is considered to be an index of the sleep stage during sleep. Therefore, the sleep stage determination method of the present invention for determining the sleep stage from the activity of the autonomic nerve during sleep has high reliability.
【００１３】[0013]
【発明の実施の形態】本発明の実施例を図をもって詳細
に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the drawings.
【００１４】図１は本実施例の睡眠段階を判定する流れ
を示すブロック図であり、図２は、圧力検出手段を断面
でもって示す断面図であり、図３は心拍のＲ−Ｒ間隔信
号のパワースペクトル密度の例を示すグラフであり、図
４は睡眠段階の判定方法を説明するためのグラフであ
る。FIG. 1 is a block diagram showing the flow of determining the sleep stage of the present embodiment, FIG. 2 is a sectional view showing the pressure detecting means in section, and FIG. 3 is a RR interval signal of the heartbeat. FIG. 4 is a graph showing an example of the power spectrum density of FIG. 4, and FIG. 4 is a graph for explaining a sleep stage determination method.
【００１５】圧力検出手段１は微差圧センサ１１と圧力
検出チューブ１２とから成り、寝台８上に配置される。
図１に示すようにチューブを数回折り返すことによって
圧力検出することが可能な寝具上の範囲を広くとるよう
にしている。The pressure detecting means 1 comprises a fine differential pressure sensor 11 and a pressure detecting tube 12, and is arranged on the bed 8.
As shown in FIG. 1, the tube is folded back a few times to widen the range on the bed where pressure can be detected.
【００１６】図２に圧力検出手段の構成とその配置例を
示す。圧力検出チューブ１２は硬質シート７１の上に配
置され、その上に弾性を有するクッションシート７２を
敷き、これらを圧力検出チューブカバー７３に収容する
ことで圧力検出チューブ１２、硬質シート７１およびク
ッションシート７２が圧力検出チューブ収容部７として
一体化されている。さらに、圧力検出チューブ１２の位
置が安定されるように、硬質シート７１あるいは、クッ
ションシートに図示しない位置決め手段を設けることに
より、硬質シート７１とクッションシート７２との間に
配置された圧力検出チューブ１２の位置を安定させるこ
とができる。また、被験者の睡眠を快適にするために、
圧力検出チューブ収容部７の上にふとん等の寝具９をお
くことが望ましい。FIG. 2 shows the structure of the pressure detecting means and an example of its arrangement. The pressure detection tube 12 is arranged on a hard sheet 71, an elastic cushion sheet 72 is laid thereon, and these are accommodated in a pressure detection tube cover 73, so that the pressure detection tube 12, the hard sheet 71, and the cushion sheet 72 are placed. Are integrated as the pressure detection tube housing 7. Furthermore, the pressure detecting tube 12 disposed between the hard sheet 71 and the cushion sheet 72 is provided by providing a positioning means (not shown) on the hard sheet 71 or the cushion sheet so that the position of the pressure detecting tube 12 is stabilized. The position of can be stabilized. In addition, in order to make the subject's sleep comfortable,
It is desirable to place a bedding 9 such as a futon on the pressure detection tube housing 7.
【００１７】微差圧センサ１１は、微小な圧力の変動を
検出するセンサであり、本実施例では、低周波用のコン
デンサマイクロホンタイプを使用するが、これに限るも
のではなく適切な分解能とダイナミックレンジを有する
ものであればよい。The minute differential pressure sensor 11 is a sensor for detecting minute pressure fluctuations. In this embodiment, a low frequency condenser microphone type is used, but the invention is not limited to this, and an appropriate resolution and dynamics are used. What has a range may be used.
【００１８】本実施で使用した低周波用のコンデンサマ
イクロフォンは、一般の音響用マイクロフォンが低周波
領域に対して配慮されていないのに引き替え、受圧面の
後方にチャンバーを設けることによって低周波領域の特
性を大幅に向上させたものであり、圧力検出チューブ１
２内の微小圧力変動を検出するのに好適なものである。
また、微小な差圧を計測するのに優れており、０．２Ｐ
ａの分解能と約５０Ｐａのダイナミックレンジを有し、
通常使用されるセラミックを利用した微差圧センサと比
較して数倍の性能を持つものであり、生体信号が体表面
に通して圧力検出チューブ１２に加えた微小な圧力をを
検出するのに好適なものである。また周波数特性は０．
１Ｈｚ〜１０Ｈｚの間でほぼ平坦な出力値を示し、心拍
および呼吸数等の微少な生体信号を検出するのに適して
いる。The low-frequency condenser microphone used in this embodiment is replaced with a chamber behind the pressure receiving surface in place of the general acoustic microphone, which is not considered for the low-frequency area. The pressure detection tube 1 has significantly improved characteristics.
It is suitable for detecting minute pressure fluctuations in the pressure chamber 2.
It is also excellent for measuring minute differential pressure,
With a resolution of a and a dynamic range of about 50 Pa,
It has several times the performance of a fine differential pressure sensor that uses ceramics that is normally used, and is used to detect the minute pressure applied to the pressure detection tube 12 through which a biological signal passes through the body surface. It is suitable. The frequency characteristic is 0.
It exhibits a substantially flat output value between 1 Hz and 10 Hz, and is suitable for detecting minute biological signals such as heartbeat and respiratory rate.
【００１９】圧力検出チューブ１２は、生体信号の圧力
変動範囲に対応して内部の圧力が変動するように適度の
弾力を有するものを使用する。また圧力変化を適切な応
答速度で微差圧センサ１１に伝達するためにチューブの
中空部の容積を適切に選ぶ必要がある。圧力検出チュー
ブ１２が適度な弾性と中空部容積を同時に満足できない
場合には、圧力検出チューブ１２の中空部に適切な太さ
の芯線をチューブ長さ全体にわたって装填し、中空部の
容積を適切にとることができる。As the pressure detection tube 12, a tube having an appropriate elasticity is used so that the internal pressure fluctuates corresponding to the pressure fluctuation range of the biological signal. Further, in order to transmit the pressure change to the differential pressure sensor 11 at an appropriate response speed, it is necessary to properly select the volume of the hollow portion of the tube. When the pressure detection tube 12 cannot satisfy both the appropriate elasticity and the volume of the hollow portion at the same time, a core wire having an appropriate thickness is loaded in the hollow portion of the pressure detection tube 12 over the entire tube length to make the volume of the hollow portion appropriate. Can be taken.
【００２０】一方、圧力検出チューブ１２の端部の処理
によっては、検出する周波数特性に違いがあることが実
験の結果判明している。圧力検出チューブ１２の端部Ｂ
（微差圧センサ１１が接続されている側とは反対の端
部）を開放にする場合は、１Ｈｚ以下の周波数成分が検
出されにくく、閉じておく場合には、１Ｈｚ以上の周波
数成分が検出されにくい。On the other hand, experimental results have shown that the frequency characteristics to be detected differ depending on the treatment of the end portion of the pressure detection tube 12. End B of the pressure detection tube 12
When the end (the end opposite to the side to which the slight differential pressure sensor 11 is connected) is opened, it is difficult to detect the frequency component of 1 Hz or less, and when it is closed, the frequency component of 1 Hz or more is detected. It is hard to be done.
【００２１】ところで、心拍信号は１Ｈｚ〜１０Ｈｚの
周波数成分が多く含まれており、圧力検出チューブ１２
の端部Ｂを開放にすることによって心拍信号に関与しな
い周波数を排除することができる。すなわち、圧力検出
チューブ１２の端部を開放することによって１Ｈｚ以下
の信号をカッとするフィルタの役目を果たし、心拍信号
を効率良く取出すことができる。By the way, the heartbeat signal contains many frequency components of 1 Hz to 10 Hz, and the pressure detection tube 12
By opening the end B of the, it is possible to eliminate frequencies that do not contribute to the heartbeat signal. That is, by opening the end of the pressure detection tube 12, the pressure detection tube 12 serves as a filter that cuts off signals of 1 Hz or less, and the heartbeat signal can be efficiently extracted.
【００２２】心拍信号検出手段２は、圧力検出手段１に
よって検出された生体振動のデータから心拍信号を検出
する手段であり、主としてフィルタを通すこととノイズ
処理を施すことにより、心拍信号を取り出す。The heartbeat signal detecting means 2 is a means for detecting the heartbeat signal from the data of the biological vibration detected by the pressure detecting means 1, and mainly extracts the heartbeat signal by filtering and performing noise processing.
【００２３】Ｒ−Ｒ間隔信号検出手段３は、心拍信号検
出手段２によって取り出された心拍信号から心拍信号の
強さがピークとなる付近の波形（Ｒ波）を検出し、Ｒ波
間のとの間隔を求める手段であり、そのデータは、パワ
ースペクトル密度演算手段４に送られる。The RR interval signal detecting means 3 detects a waveform (R wave) near the peak of the strength of the heartbeat signal from the heartbeat signal extracted by the heartbeat signal detecting means 2, and detects the waveform between the R waves. It is a means for obtaining the interval, and the data thereof is sent to the power spectral density calculation means 4.
【００２４】パワースペクトル密度演算手段４では、Ｒ
−Ｒ間隔信号検出手段３から送られてくる連続した一定
個数のデータについてフーリエ変換を施し、パワースペ
クトル密度を導き出す手段であり、そのデータは睡眠段
階判定手段５に送られる。In the power spectral density calculation means 4, R
This is a means for performing a Fourier transform on a continuous fixed number of data sent from the -R interval signal detecting means 3 to derive a power spectral density, and the data is sent to the sleep stage judging means 5.
【００２５】睡眠段階判定手段５は、パワースペクトル
密度演算手段４で得られたパワースペクトル密度から、
睡眠段階を判定する手段であり、パワースペクトル密度
の極大値を手がかりにして判定を行う。その結果は、モ
ニタ６に表示されるとともに、被験者の正常時のデータ
と比較することによって健康管理に使用することができ
る。The sleep stage judging means 5 calculates from the power spectral density obtained by the power spectral density calculating means 4
It is a means for determining the sleep stage, and makes the determination by using the maximum value of the power spectral density as a clue. The result is displayed on the monitor 6 and can be used for health management by comparing with the data of the subject under normal conditions.
【００２６】次に睡眠段階判定の手順について、図３及
び図４を参照して説明する。Next, the procedure of sleep stage determination will be described with reference to FIGS. 3 and 4.
【００２７】図３（ａ）は、交感神経が優位な場合のパ
ワースペクトル密度を示し、図３（ｂ）は副交感神経が
優位な場合のパワースペクトル密度を示している。これ
から分かるようにパワースペクトル密度は、自律神経系
の状態により、異なる様相を示すことが分かる。FIG. 3A shows the power spectrum density when the sympathetic nerve is dominant, and FIG. 3B shows the power spectrum density when the parasympathetic nerve is dominant. As can be seen, the power spectral density shows different aspects depending on the state of the autonomic nervous system.
【００２８】すなわち、０．０５〜０．１５Ｈｚの帯域
（ＬＦと呼ぶ）と、０．２〜０．３５Ｈｚの帯域（ＨＦ
と呼ぶ）に顕著な極大値が現れる。ＬＦが大きな値でＨ
Ｆが小さな値の場合には、交感神経が活発で緊張時であ
ることを示し、ＬＦが小さくＨＦが大きい場合には、副
交感神経が活発であることを示している。That is, a band of 0.05 to 0.15 Hz (called LF) and a band of 0.2 to 0.35 Hz (HF)
Called)) has a remarkable maximum. H with a large LF value
A small value of F indicates that the sympathetic nerve is active and in tension, and a small value of LF and large HF indicates that the parasympathetic nerve is active.
【００２９】睡眠中は心拍数が減少するが、これは緊張
時に活発となる交感神経活動が低下し、弛緩時に活発と
なる副交感神経活動が増加することによるものである。During sleep, the heart rate decreases, which is due to a decrease in sympathetic nerve activity that is active during tension and an increase in parasympathetic nerve activity that is active during relaxation.
【００３０】睡眠中の交感神経および副交感神経の活動
は必ずしも一様でなく、睡眠段階によって異なる。すな
わち、ＬＦおよびＨＦと睡眠段階との関係は、図４のよ
うになることが実験的確かめられているので、この図４
に示される関係を利用して睡眠段階を判定する。The activity of the sympathetic and parasympathetic nerves during sleep is not always uniform and varies with sleep stage. That is, it has been experimentally confirmed that the relationship between LF and HF and the sleep stage is as shown in FIG.
The sleep stage is determined using the relationship shown in.
【００３１】判定基準は、次の通りである。
（１）ＬＦが大きく、ＨＦが小の場合は、レム睡眠期で
ある。
（２）ＨＦが大の場合は、ノンレム第１および第２期で
ある。
（３）ＬＦおよびＨＦともに小の場合は、ノンレム第３
および第４期である。
また、ＬＦあるいは、ＨＦの値が中間値である場合に
は、その値に応じて図４のグラフから判断する。The criteria for judgment are as follows. (1) When LF is large and HF is small, it is a REM sleep period. (2) When HF is large, it is the first and second periods of non-REM. (3) When both LF and HF are small, the third non-REM
And it is the 4th period. Further, when the value of LF or HF is an intermediate value, it is judged from the graph of FIG. 4 according to the value.
【００３２】このようにして得られた睡眠段階のデータ
はモニタ６に表示されるとともに、健康管理装置などに
被験者の健康状態を判断するためのデータとして送ら
れ、利用される。The sleep stage data thus obtained is displayed on the monitor 6 and is sent to a health management device or the like as data for judging the health condition of the subject to be used.
【００３３】本実施例では、無侵襲センサとして、チュ
ーブとチューブ内の圧力変化を検出する微差圧センサか
らなる構成としたが、これに限るものではなく、被験者
の身体の下に敷いたエアマット内の圧力を検出する検出
手段を用いてもよい。また、被験者の身体の下に敷いた
電極間の静電容量の変化を検出する検出手段や、被験者
の身体の下に敷いた電線の抵抗変化を検出する検出手段
を用いることができる。In this embodiment, the non-invasive sensor is composed of a tube and a minute differential pressure sensor for detecting a pressure change in the tube. However, the present invention is not limited to this, and an air mat laid under the body of the subject. You may use the detection means which detects the pressure inside. Further, it is possible to use a detecting means for detecting a change in electrostatic capacitance between electrodes laid under the body of the subject and a detecting means for detecting a resistance change of an electric wire laid under the body of the subject.
【００３４】本実施例では圧力検出手段１を１個のみ制
御装置に接続した例で説明したが、複数個接続し、同時
に心拍信号や呼吸信号等の複数の生体信号を検出するよ
うにしてもよい。In the present embodiment, an example in which only one pressure detecting means 1 is connected to the control device has been described, but a plurality of pressure detecting means 1 may be connected to simultaneously detect a plurality of biological signals such as heartbeat signals and respiratory signals. Good.
【００３５】また、本実施例では横臥した被験者の生体
信号を測定する場合について説明したが、着座姿勢で作
業中の作業者や車両運転者の場合に着座した座席にこの
圧力検出手段を配置することによって被験者の生体信号
を検出することも可能であり、運転中の運転者が居眠り
状態を検出することに利用できる。In this embodiment, the case where the biological signal of a recumbent subject is measured has been described. However, this pressure detecting means is arranged in the seat seated by a worker who is working in a sitting posture or a vehicle driver. As a result, it is possible to detect the biological signal of the subject, which can be used by the driver who is driving to detect the dozing state.
【００３６】[0036]
【発明の効果】被験者の日常の健康状態を知るために睡
眠の状態やその質を知ることが有効であることは判って
いるが、個人の健康管理の目的に簡単に利用できる睡眠
段階の検出装置は現在のところないのが現状である。Although it has been known that it is effective to know the sleep condition and quality in order to know the daily health condition of the subject, it is possible to easily detect the sleep stage for the purpose of personal health management. Currently, there is no device.
【００３７】本発明の睡眠段階判定方法は、無侵襲な検
出手段を用いて心拍信号を検出し、この心拍信号を演算
処理することにより被験者の睡眠段階を判定するもので
あり、被験者に測定用の電極などを装着する必要がない
ので、被験者に身体的および精神的な負担をかけること
なく日常的に使用することが可能となる。The sleep stage determination method of the present invention detects a heartbeat signal by using a non-invasive detecting means, and processes the heartbeat signal to determine the sleep stage of the subject. Since it is not necessary to wear the electrodes and the like, it becomes possible to use the subject on a daily basis without physically or mentally burdening the subject.
【００３８】また、心拍信号から検出したＲ−Ｒ間隔信
号から求めたパワースペクトル密度は、自律神経の状態
を示す良好な指標であるために、睡眠時の睡眠段階の指
標にもなると考えられる。したがって、睡眠時の自律神
経の活動から睡眠段階を判定する本発明の睡眠段階判定
方法は、高い信頼性を備えている。Since the power spectrum density obtained from the RR interval signal detected from the heartbeat signal is a good index showing the state of the autonomic nerve, it is considered to be an index of the sleep stage during sleep. Therefore, the sleep stage determination method of the present invention for determining the sleep stage from the activity of the autonomic nerve during sleep has high reliability.
【図１】本発明の実施例の睡眠段階を判定する流れを示
すブロック図である、FIG. 1 is a block diagram showing a flow of determining a sleep stage according to an embodiment of the present invention,
【図２】圧力検出手段を断面でもって示す説明図であ
る。FIG. 2 is an explanatory view showing a pressure detecting means in cross section.
【図３】心拍のＲ−Ｒ間隔信号のパワースペクトル密度
関数の例を示すグラフである。FIG. 3 is a graph showing an example of a power spectral density function of a heartbeat RR interval signal.
【図４】睡眠段階の判定方法を説明するためのグラフで
ある。FIG. 4 is a graph for explaining a method of determining a sleep stage.
１ 圧力検出手段 ２ 心拍信号検出手段 ３ Ｒ−Ｒ間隔信号検出手段 ４ パワースペクトル密度演算手段 ５ 睡眠段階判定手段 ６ モニタ ７ 圧力検出チューブ収容部 ８ 寝台 ９ 寝具 １１ 微差圧センサ １２ 圧力検出チューブ ７１ 硬質シート ７２ クッションシート ７３ 圧力検出チューブカバー 1 Pressure detection means 2 Heartbeat signal detection means 3 RR interval signal detecting means 4 Power spectral density calculation means 5 Sleep stage determination means 6 monitors 7 Pressure detection tube housing 8 sleepers 9 bedding 11 Fine differential pressure sensor 12 Pressure detection tube 71 hard sheet 72 cushion seat 73 Pressure detection tube cover
Claims (3)
拍信号を検出し、この心拍信号から睡眠段階を判定する
睡眠段階判定方法であって、心拍信号から検出したＲ−
Ｒ間隔信号にフーリエ変換を施してパワースペクトル密
度を求め、このパワースペクトル密度の極大値から睡眠
段階を判定することを特徴とする睡眠段階判定方法。1. A sleep stage determination method for detecting a heartbeat signal from a biological signal detected by a non-invasive sensor and determining a sleep stage from the heartbeat signal, the R-detected from the heartbeat signal.
A sleep stage determination method, characterized in that a Fourier transform is applied to an R interval signal to obtain a power spectrum density, and a sleep stage is determined from the maximum value of the power spectrum density.
大値と低周波成分の極大値とから睡眠段階を判定するこ
とを特徴とする請求項１に記載の睡眠段階判定方法。2. The sleep stage determination method according to claim 1, wherein the sleep stage is determined from the maximum value of the high frequency component and the maximum value of the low frequency component of the power spectrum density.
の圧力変化を検出する微差圧センサとからなり、微差圧
センサにより検出したチューブ内の圧力変化信号から心
拍信号を検出することを特徴とする請求項１に記載の睡
眠段階判定方法。3. The non-invasive sensor comprises a tube and a minute differential pressure sensor for detecting a pressure change in the tube, and detects a heartbeat signal from a pressure change signal in the tube detected by the minute differential pressure sensor. The sleep stage determination method according to claim 1.
Priority Applications (1)
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|---|---|---|---|
| JP2001363435A JP3831918B2 (en) | 2001-10-25 | 2001-10-25 | Salivary stage determination device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001363435A JP3831918B2 (en) | 2001-10-25 | 2001-10-25 | Salivary stage determination device |
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| JP2003126052A true JP2003126052A (en) | 2003-05-07 |
| JP3831918B2 JP3831918B2 (en) | 2006-10-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004107978A1 (en) * | 2003-06-03 | 2004-12-16 | Cb System Co. | Sleep stage judgment method and judgment device |
| JP2006014813A (en) * | 2004-06-30 | 2006-01-19 | Daikin Ind Ltd | Sleep diary recording apparatus |
| JP2008194400A (en) * | 2007-02-16 | 2008-08-28 | Kinden Corp | Pneumatic sensor |
| JP2008264138A (en) * | 2007-04-18 | 2008-11-06 | Delta Tooling Co Ltd | Sleep state judgement apparatus, sleep state judgement method and computer program |
| CN108030472A (en) * | 2017-12-21 | 2018-05-15 | 南京麦狄司特科技有限公司 | Sleep monitor band |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5632986B2 (en) * | 2010-09-24 | 2014-12-03 | 株式会社スリープシステム研究所 | Sleep stage determination device and sleep stage determination method |
-
2001
- 2001-10-25 JP JP2001363435A patent/JP3831918B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004107978A1 (en) * | 2003-06-03 | 2004-12-16 | Cb System Co. | Sleep stage judgment method and judgment device |
| JP2006014813A (en) * | 2004-06-30 | 2006-01-19 | Daikin Ind Ltd | Sleep diary recording apparatus |
| JP2008194400A (en) * | 2007-02-16 | 2008-08-28 | Kinden Corp | Pneumatic sensor |
| JP2008264138A (en) * | 2007-04-18 | 2008-11-06 | Delta Tooling Co Ltd | Sleep state judgement apparatus, sleep state judgement method and computer program |
| CN108030472A (en) * | 2017-12-21 | 2018-05-15 | 南京麦狄司特科技有限公司 | Sleep monitor band |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3831918B2 (en) | 2006-10-11 |
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