Some systems, devices and methods detailed herein provide a system for use in determining metrics of a subject. The system can provide, as an output, a function-metric value determined based on a defined relationship between physiological measures and a chronological age.

A sphygmomanometer of the present invention includes a bag-shaped sensing cuff to be worn to wrap a measurement site, a back plate disposed on the sensing cuff along a surface opposite to the measurement site, a pressing member for pressing the back plate toward the measurement site, and a blood-pressure calculating part calculating a blood pressure based on a pressure of a fluid stored in the sensing cuff. Regarding a longitudinal direction perpendicular to a circumferential direction of the measurement site to be wrapped by the sensing cuff, a dimension of the back plate in a width direction along the longitudinal direction is larger than a dimension of the sensing cuff in the width direction.

An apparatus for measuring bio-information may include a pulse wave sensor that may measure a pulse wave signal from an object in contact with a measurement surface. The apparatus may include a force sensor that may measure a contact force between the pulse wave sensor and the object. The apparatus may include a fastener configured to fasten the pulse wave sensor to an electronic device such that the pulse wave sensor is rotatable around a center axis in a length direction of the pulse wave sensor. The apparatus may include a processor that may determine a direction in which a measurement region of the pulse wave signal or the measurement surface of the pulse wave sensor is oriented, select a measurement mode from among a plurality of measurement modes, and estimate bio-information of the object.

An antioxidant sensor includes a pressure sensor configured to obtain a contact pressure between an object and an optical sensor; the optical sensor configured to, based on the obtained contact pressure exceeding a set threshold pressure, emit a first light of a first wavelength to the object, and receive the first light reflected or scattered from the object; and a processor configured to determine a contact portion of the object in contact with the optical sensor, set a threshold pressure, among different threshold pressures, according to the determined contact portion, and determine an antioxidant value based on the received first light.

Provided is an apparatus configured to estimate bio-information, the apparatus including a pulse wave sensor including a plurality of channels disposed in an isotropic shape, a force sensor configured to measure a force applied by an object to the pulse wave sensor, and a processor configured to detect a center of gravity based on pressure, applied by the object, in a space formed by the plurality of channels based on pulse wave signals measured by each of the plurality of channels included in the pulse wave sensor, provide a user with guide information with respect to contact of the object to the pulse wave sensor based on the detected center of gravity, and estimate bio-information based on the pulse wave signals and the force which are measured based on the guide information.

A device for skin-contact biological measurement includes one or more electrodes to enable signal transmission through a skin contact and a control mechanism coupled to the one or more electrodes to adjust an electrode-to-skin impedance (ESI). The control mechanism is configured to implement the ESI adjustment using a thermal actuator.

An optical measuring apparatus includes first and second light-emitting elements that emit light and a controller. Upon detection of the presence of a body by light emitted from the first light-emitting element, the controller performs control so that the second light-emitting element will emit light with an amount for measuring the body.

A wearable device includes a processor and a lower module. The lower module includes a pressure sensor for detecting a mechanical movement of a skin that covers an artery. The mechanical movement of the skin is due to blood flow through the artery. The processor is configured to receive skin movement information from the movement sensor; calculate a pulse front velocity (PFV), which is a velocity of a blood wave as the blood wave passes under the pressure sensor; estimate a pulse wave velocity (PWV) using the PFV; and estimate the blood pressure using the PWV.

In an embodiment a wrist-worn electronic device includes a main body, a wrist strap connected to the main body, wherein the wrist strap is configured to place the main body on a wrist of a target user, a wrist size determining part configured to measure, by using the wrist strap of the wrist-worn electronic device, a use circumference of the wrist-worn electronic device that matches a wrist size of the target user, and determine the wrist size of the target user based on the use circumference of the wrist-worn electronic device, and a blood pressure determining part configured to detect a pulse wave signal of the target user, measure a measured blood pressure of the target user based on the pulse wave signal, and correct the measured blood pressure of the target user based on the wrist size of the target user thereby obtaining a first corrected blood pressure of the target user.

A method of controlling an analysis of electromagnetic (EM) signal of a human subject. The method comprises positioning an EM transducer unit in front of a skin area above a target intrabody volume of a human subject, the EM transducer unit having at least one EM transducer, a pressure applying unit that applies a variable pressure on the skin area, and a pressure sensor, measuring at least one pressure parameter indicative of the variable pressure using the pressure sensor, capturing EM signal using the at least one EM transducer, and performing an analysis of the EM signal to infer at least one intrabody parameter of the target intrabody volume. The analysis is controlled according to the at least one pressure parameter.