Abstract: A device according to an embodiment includes: a simulated skin portion being located near a photoelectric pulse wave sensor to simulate a blood flow of the skin; a reflectance changing unit located on an opposite side of the simulated skin portion to the photoelectric pulse wave sensor, the reflectance changing unit changing, in time series, reflectance of light emitted from the light-emitting unit of the photoelectric pulse wave sensor and passing through the simulated skin portion; a reflectance change control unit that transmits a reflectance control signal to the reflectance changing unit to control changes in reflectance of the reflectance changing unit; and a synchronization signal output unit that outputs a signal in sync with the reflectance control signal to an external device.

Abstract: A pulse wave measuring device includes: a connector that is disposed on a main unit; an external sensor that includes an external light-emitting module radiating light to a human body to be measured and an external light-receiving module receiving at least one of reflected light and transmitted light originating from the external light-emitting module and the human body so as to measure a pulse wave; an first controller that switches the external light-emitting module ON and OFF; an second controller that switches the external light-receiving module ON and OFF; and an external sensor connection determination section that determines a connection between the external sensor and the connector in accordance with a transient response of the external light-receiving module, wherein, after the external sensor connection determination section determines that the external sensor is connected to the connector, a measurement of the pulse wave by using the external sensor is started.

Abstract: According to an embodiment, a determination device includes a first calculator, a second calculator, a determination unit, and an output unit. The first calculator is configured to calculate inclination information that indicates inclination of an attachment surface to which a body unit is to be attached, based on acceleration of the body unit measured during a first period. The second calculator is configured to calculate difference information that indicates a difference between the inclination information stored in a storage and inclination information newly calculated by the first calculator. The determination unit is configured to determine that an attached state of the body unit with respect to the attachment surface changes when the difference information continuously indicates a difference not less than a predetermined value during a second period. The output unit is configured to output information based on a determination result obtained by the determination unit.

Abstract: According to the invention, a pulse wave measuring device includes: a connector that is disposed on a main unit; an external sensor that includes an external light-emitting module radiating light to a human body to be measured and an external light-receiving module receiving at least one of reflected light and transmitted light originating from the external light-emitting module and the human body so as to measure a pulse wave; an first controller that switches the external light-emitting module ON and OFF; an second controller that switches the external light-receiving module ON and OFF; and an external sensor connection determination section that determines a connection between the external sensor and the connector in accordance with a transient response of the external light-receiving module, wherein, after the external sensor connection determination section determines that the external sensor is connected to the connector, a measurement of the pulse wave by using the external sensor is started.

Abstract: According to an embodiment, an electrocardiograph includes first and second electrode pairs, first and second detectors, and an electrocardiogram detector. A difference between a first distance between two electrodes of the first electrode pair on a first line and a second distance between two electrodes of the second electrode pair on a second line is not more than a first threshold. An angle formed by the first and second lines is not less than a second threshold. The first detector is configured to detect a first differential electric potential of the first electrode pair. The second electric potential detector is configured to detect a second differential electric potential of the second electrode pair. The electrocardiogram detector is configured to detect an electrocardiogram by performing a subtraction process on the first and second differential electric potentials.

Abstract: Pulse waves of a subject are detected in time sequence. Amplitude of the pulse waves is detected, and an interval between two pulse waves adjacent along a time axis is detected. A first change ratio of the interval along the time axis, and a second change ratio of the amplitude divided by the interval along the time axis are calculated respectively. By comparing the first change ratio and the second change ratio with a first threshold and a second threshold respectively, it is decided whether the pulse waves of the subject are irregular.

Abstract: A biosignal measuring device has a first information acquisition module, a second information acquisition module, a first calculation module, a second calculation module, a third calculation module, a heartbeat interval estimation module, a determination module, and an output module. The first information acquisition module acquires the pulse wave signal. The second information acquisition module acquires an electrocardiogram signal. The first calculation module calculates a pulse wave velocity based. The second calculation module determines a heartbeat interval. The third calculation module calculates a relationship between pulse wave velocity and the heartbeat interval. The heartbeat interval estimation module estimates an estimated heartbeat interval based on pulse wave velocity and calculated relationship. The determination module determines whether the position of the first and second information acquisition modules has changed based on the heartbeat interval and the estimated heartbeat interval.

Abstract: A pulse wave period measuring apparatus according to an embodiment of the present invention detects a pulse wave of a subject, detects a maximum value and a minimum value in a predetermined period of the pulse wave, calculates one or more reference values between the maximum value and the minimum value in the predetermined period, based on one or more internally dividing ratios common to plural predetermined periods of the pulse wave, calculates two or more times in the predetermined period, the apparatus calculating the two or more times at which the pulse wave intersects with the one or more reference values, calculates a time period between each calculated time in the predetermined period and a corresponding calculated time in a last period before the predetermined period, as a pulse wave period of the pulse wave, calculates a variation of pulse wave periods, for two or more pulse wave periods calculated between the predetermined period and the last period before the predetermined period, and calculates, b

Abstract: A pulse wave measuring apparatus includes a pulse wave measuring unit measuring a pulse wave; a first detection unit detecting first maximum and minimum values; a second detection unit detecting second maximum and minimum values; an update unit updating the first maximum and minimum values with the second maximum and minimum values after time periods; an initialization unit initializing the second maximum and minimum values after updating the first maximum and minimum values; a timing detection unit detecting a time determined by the first maximum and minimum values; and an interval calculation unit calculating a pulse wave interval using the timing.

Abstract: According to an embodiment, a pulse measuring device includes a pulse detecting unit, an amplitude calculating unit, an interval calculating unit, an extracting unit, and a determining unit. The pulse detecting unit is configured to detect a pulse of a subject. The amplitude calculating unit is configured to calculate an amplitude of the pulse. The interval calculating unit is configured to calculate an interval of the pulse. The extracting unit is configured to extract a fluctuation variation component which varies in operative association with breathing of the subject from the interval. The determining unit is configured to determine that an apnea event occurs when the amplitude or the interval is reduced at a first time and the fluctuation variation component is reduced at a second time which is immediately before the first time.

Abstract: A thermal sensation determining apparatus includes a skin temperature detecting unit configured to detect a skin temperature of a peripheral site of a subject's body, a variation state determining unit configured to determine a variation state of the skin temperature during a first interval to obtain a variation state determination result, a gradient detecting unit configured to detect a gradient of the skin temperature during a second interval to determine the gradient to obtain a gradient detection result, and a thermal sensation determining unit configured to determine the subject's thermal sensation using the variation state determination result and the gradient detection result to obtain a thermal sensation determination result classified into levels ranging from “hot” to “cold” based on a “moderate” temperature.

Abstract: Pulse wave signal data expressing the pulse wave of a subject and body movement signal data expressing body movements of the subject are obtained so that a correlation coefficient expressing the degree of correlation between the pulse wave signal data and the body movement signal data is calculated. One or more pieces of the pulse wave signal data in which the correlation coefficient is equal to or larger than a predetermined threshold value are eliminated.

Abstract: A detection-rate calculating unit calculates a detection rate representing a ratio of number of interval data representing a time interval of one cycle of a waveform of at least one of a pulse and a heart rate, generated within a predetermined reference time to a sum of the number of the interval data and number of error data representing a content of an error occurred while the interval data is generated. When the detection rate is larger than the first threshold, an index calculating unit calculates an autonomic-nervous index representing an autonomic-nervous activity state, based on the interval data generated within the reference time.

Abstract: A sleep state measuring apparatus includes an autonomic nerve index obtaining unit that obtains a user's autonomic nerve index; and a sleep periodicity index calculating unit that calculates a sleep periodicity index based on a temporal change of the autonomic nerve index and a change in a user's sleeping cycle, wherein the sleep periodicity index indicates whether the user is sleeping or not according to a user's ideal sleeping cycle as an index, or a dominance index calculating unit that calculates a parasympathetic nerve dominance index which shows dominance of a parasympathetic nerve index included in the autonomic nerve index with respect to a sympathetic nerve index included in the autonomic nerve index for a user during sleep.

Abstract: According to one embodiment, an apparatus for deciding a risk includes a measurement unit and an analysis unit. The measurement unit is configured to measure a physiological index of a subject' s peripheral blood flow. The analysis unit is configured to calculate a ripple appeared in the physiological index and to decide a risk of abnormality of the subject' s thermoregulation by the ripple.

Abstract: An apparatus for determining a respiratory condition includes a breath sound measuring unit 111 measuring a breath sound passing through a subject's airway by a breathing; a frequency converting unit 132 converting a frequency on the breath sound to obtain a frequency spectrum; a respiratory synchronous component extracting unit 134 extracting a respiratory synchronous component, which varies depending on the breathing, from the frequency spectrum; a frequency distribution detecting unit 136 detecting a frequency distribution of the respiratory synchronous component; and a respiratory condition determining unit 138 determining a subject's respiratory condition based on the frequency distribution. According to the apparatus, various symptoms, such as airway occlusion, respiratory obstruction and the like in relation to breathing during sleep can be determined.

Abstract: Pulse waves of a subject are detected in time sequence. Amplitude of the pulse waves is detected, and an interval between two pulse waves adjacent along a time axis is detected. A first change ratio of the interval along the time axis, and a second change ratio of the amplitude divided by the interval along the time axis are calculated respectively. By comparing the first change ratio and the second change ratio with a first threshold and a second threshold respectively, it is decided whether the pulse waves of the subject are irregular.

Abstract: A biological-information monitoring apparatus includes a detecting unit that detects pulse intervals of a target person. Moreover, a first calculating unit calculates an average pulse interval that is an average of the pulse intervals within a first period. The first period is decided based on a target pulse interval. Finally, a second calculating unit calculates a parasympathetic nervous index based on a difference between the average pulse interval and the target pulse interval.

Abstract: A biotic sleep state determining apparatus that determines a sleep state of a subject based on a series of pulse interval data that indicate a time interval of one cycle of a pulse wave of the subject, and on body movement data that indicates a body movement of the subject, the apparatus includes a body movement determining unit that determines that the body movement occurs if a fluctuation amount of the body movement data is greater than a first predetermined threshold, a pulse interval data processor that processes the series of pulse interval data after removing pulse interval data measured in parallel with the body movement data from the series of pulse interval data, if the body movement determining unit determines that the body movement occurs, and a sleep state determining unit that determines the sleep state based on autonomic nerve indexes acquired from the series of pulse interval data processed by the pulse interval data processor.