Abstract: A method includes collecting a set of user information, determining a user current performance by: determining a sleep score or debt, measuring the user's previous physical activity, heart rate, or body temperature, calculating weights for the sleep score and the sleep debt, the measured previous physical activity, heart rate, or body temperature, calculating a weighted sum of the weighted sleep score, the weighted sleep debt, the weighted user's previous physical activity, weighted heart rate, or weighted body temperature, setting a user target level of performance, measuring a circadian rhythm and a user's duration of sleep or sleep cycle, comparing the circadian rhythm, the duration of sleep or sleep cycle, the current performance level, and current time zone information over days to determine a separate user performance level, comparing the target level of performance to the separate user performance level, and providing an alert and feedback user related to the comparison.

Abstract: A method includes collecting a set of user information, determining a user current performance by: determining a sleep score or debt, measuring the user's previous physical activity, heart rate, or body temperature, calculating weights for the sleep score and the sleep debt, the measured previous physical activity, heart rate, or body temperature, calculating a weighted sum of the weighted sleep score, the weighted sleep debt, the weighted user's previous physical activity, weighted heart rate, or weighted body temperature, setting a user target level of performance, measuring a circadian rhythm and a user's duration of sleep or sleep cycle, comparing the circadian rhythm, the duration of sleep or sleep cycle, the current performance level, and current time zone information over days to determine a separate user performance level, comparing the target level of performance to the separate user performance level, and providing an alert and feedback user related to the comparison.

Abstract: Methods, systems, and devices for menstrual cycle onset prediction are described. The method may include receiving physiological data associated with a user from a wearable device, the physiological data including at least temperature data. The method may include fitting the received temperature data to a trigonometric or polynomial function including a plurality of features and calculating a duration between the plurality of features and a corresponding plurality of menstrual cycle onset days. The method may include estimating a future menstrual cycle onset day that the user experiences a first day of a menstrual cycle based on applying the duration to a most recent feature of the trigonometric or polynomial function. In some cases, the method may include causing a graphical user interface of a user device to display an indication of the estimated future menstrual cycle onset day.

Abstract: Disclosed is an apparatus for measuring photoplethysmogram. The apparatus includes a ring structure with at least one photon source and at least one photon detector positioned on an inner surface of the ring structure. The apparatus further includes a controller configured to measure a preliminary photoplethysmogram during a first time period by taking a first number of samples, determine a form factor from said preliminary photoplethysmogram, determine an inter beat interval from said preliminary photoplethysmogram, and use the form factor and the inter beat interval to determine a second number of samples to be taken during a second time period of measurement of the photoplethysmogram and the distribution of the samples to be taken in function of time.

Abstract: Methods, systems, and devices for providing guidance during rest and recovery are described. A method may include receiving physiological data associated with a user from a wearable device. The method may include providing, to a user device associated with the user, a first set of physical activity targets and a first set of activity messages based on the received physiological data, where the first set of physical activity targets and the first set of activity messages associated with a first operational mode associated with the user. The method may include identifying a trigger to transition from the first operational mode to a second operational mode associated with the user.

Abstract: An apparatus for measuring photoplethysmogram includes a ring structure with at least one photon source and at least one photon detector positioned on an inner surface of the ring structure. The apparatus further includes a controller configured to measure a preliminary photoplethysmogram during a first time period by taking a first number of samples, determine a form factor from the preliminary photoplethysmogram, determine an inter beat interval from the preliminary photoplethysmogram, and use the form factor and the inter beat interval to determine a second number of samples to be taken during a second time period of measurement of the photoplethysmogram and the distribution of the samples to be taken in function of time.

Abstract: A method includes collecting a set of user information, determining a user current performance by: determining a sleep score or debt, measuring the user's previous physical activity, heart rate, or body temperature, calculating weights for the sleep score and the sleep debt, the measured previous physical activity, heart rate, or body temperature, calculating a weighted sum of the weighted sleep score, the weighted sleep debt, the weighted user's previous physical activity, weighted heart rate, or weighted body temperature, setting a user target level of performance, measuring a circadian rhythm and a user's duration of sleep or sleep cycle, comparing the circadian rhythm, the duration of sleep or sleep cycle, the current performance level, and current time zone information over days to determine a separate user performance level, comparing the target level of performance to the separate user performance level, and providing an alert and feedback user related to the comparison.

Abstract: Disclosed is a system for providing feedback to a user for improving performance level management. The system includes a wearable electronic device with means for measuring circadian rhythm and duration of sleep; a mobile communication device configured to communicate with the wearable electronic device; and a server configured to communicate with the mobile communication device, and operable to collect a first set of information from the user, calibrate the first set of information based on a set of measurement data from the wearable electronic device, set a target level of performance of the user, compare the measured circadian rhythm, the measured duration of sleep and time information against each other and a set of rules to determine the performance level of the user, compare the determined performance level to the target level of performance, and provide an alert and feedback when the determined performance level is below the target level of performance.

Abstract: Disclosed is an apparatus for measuring photoplethysmogram. The apparatus includes a ring structure with at least one photon source and at least one photon detector positioned on an inner surface of the ring structure. The apparatus further includes a controller configured to measure a preliminary photoplethysmogram during a first time period by taking a first number of samples, determine a form factor from said preliminary photoplethysmogram, determine an inter beat interval from said preliminary photoplethysmogram, and use the form factor and the inter beat interval to determine a second number of samples to be taken during a second time period of measurement of the photoplethysmogram and the distribution of the samples to be taken in function of time.

Abstract: A method of determining a user's training load, includes determining protein combustion information and determining the user's training load based on the protein combustion information. The protein combustion information may be determined using heart rate information, activity information, carbohydrate reserve information determined using a carbohydrate combustion model and carbohydrate reserve information representing the user's carbohydrate reserves at a beginning of at least one exercise session, fitness information, intensity information, nutritional intake information representing nutritional intake during at least one exercise session, and/or a fat combustion model. The user's training load may be determined based on a mechanical stimulus and/or a modality. Recovery time information may be determined based on the training load. A corresponding apparatus and computer-readable medium correspond to the above method.

Abstract: A method of determining a user's training load, includes determining protein combustion information and determining the user's training load based on the protein combustion information. The protein combustion information may be determined using heart rate information, activity information, carbohydrate reserve information determined using a carbohydrate combustion model and carbohydrate reserve information representing the user's carbohydrate reserves at a beginning of at least one exercise session, fitness information, intensity information, nutritional intake information representing nutritional intake during at least one exercise session, and/or a fat combustion model. The user's training load may be determined based on a mechanical stimulus and/or a modality. Recovery time information may be determined based on the training load. A corresponding apparatus and computer-readable medium correspond to the above method.