Abstract: A method of estimating a stress level of a human by an apparatus using heart activity measurement data includes: executing a breathing exercise application by the apparatus, starting a breathing exercise of the breathing exercise application and outputting, during the breathing exercise, breathing instructions to a user of the apparatus; acquiring a set of heart activity measurement data samples measured by a heart activity sensor from the user during the breathing exercise; computing a set of inter-heartbeat interval samples of the set of heart activity measurement data samples; computing a cardiac coherence of the user during the exercise from the set of inter-heartbeat interval samples; measuring a respiratory rate of the user during the breathing exercise; computing a score of the breathing exercise on the basis of the respiratory rate and the cardiac coherence, the score indicating a stress level of the user; and outputting the score through an interface of the apparatus.

Abstract: A measurement system includes one or more sensor devices that measure physiological measurement data; an apparatus including a portable electronic device and/or server computer that performs operations including receiving the physiological measurement data from the sensor device; associating the physiological measurement data with a user account of the user; determining whether the received physiological measurement data includes physiological measurement data required by an algorithm; as a response to determining that the received physiological measurement data includes physiological measurement data required by the algorithm, performing the algorithm; and as a response to determining that the received physiological measurement data includes the physiological measurement data required by the algorithm included in a coaching category that is in an inactive state, changing the coaching category to an active state.

Abstract: A system that monitors user activity includes a wrist device including a curved body and an electronic circuitry supported by the body. The electronic circuitry includes a first set of light emitting diodes arranged in a matrix form and forming a display unit, at least one motion sensor configured to measure physical motion caused by a user to the wrist device, and at least one processor configured to acquire motion measurement data from the at least one motion sensor, to process the motion measurement data into a motion activity metric, and to cause the display unit to display the motion activity metric. The at least one processor is further configured to acquire heart activity measurement data from a heart activity sensor, to process the heart activity measurement data into a heart activity metric, and to cause the display unit to display the heart activity metric.

Abstract: A method for physiological monitoring of a user includes: acquiring, by an apparatus, physiological measurement data of the user, wherein the physiological measurement data is obtained using one or more sensor units; associating the physiological measurement data with a user account of the user, wherein the user account includes a plurality of coaching categories, and each coaching category includes one or more algorithms; determining whether the acquired physiological measurement data includes data required by at least one of the algorithms; and as a response to determining that the acquired physiological measurement data includes the required data for the at least one algorithm, performing the at least one algorithm. The performing causing an output of coaching-category-specific instructions to the user in each of the coaching categories including the at least one performed algorithm.

Abstract: A system that monitors user activity includes a wrist device including a curved body and an electronic circuitry supported by the body. The electronic circuitry includes a first set of light emitting diodes arranged in a matrix form and forming a display unit, at least one motion sensor configured to measure physical motion caused by a user to the wrist device, and at least one processor configured to acquire motion measurement data from the at least one motion sensor, to process the motion measurement data into a motion activity metric, and to cause the display unit to display the motion activity metric. The at least one processor is further configured to acquire heart activity measurement data from a heart activity sensor, to process the heart activity measurement data into a heart activity metric, and to cause the display unit to display the heart activity metric.