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A wireless recharging battery can be removably and replaceably coupled to a physiological monitoring device in a manner that securely retains the wireless recharging battery in a precise location relative to a corresponding wireless power interface of the monitoring device, while facilitating intuitive and easy removal and replacement of the wireless recharging battery by a user.

Abstract An enclosure for an electronic device, such as a wearable physiological monitor, may be formed of at least two different materials, e.g., a first part formed of a first material (e.g., a metal) and a second part formed of a second material (e.g., a plastic). The second part may include an opening to receive at least a portion of the first part therein, where the first part includes an anchor projecting from a surface thereof into the opening of the second part. To ensure that the enclosure is waterproof, a third part that can be chemically bonded to the second part may secure the first part by filling a volume between the anchor of the first part and an adjacent surface of the second part around the opening. In some aspects, the chemical bond between the second part and the third part creates an environmental seal around the opening.

Abstract Sleep need for a user is assessed using continuous physiological data from a wearable monitor. In particular, by calculating a first sleep debt metric based on user strain and a second sleep debt metric based on accumulated sleep debt, an objective metric can be obtained that estimates an amount of sleep needed by the user in a next sleep period. This approach takes advantage of multiple modes of information embedded in the physiological data, such as a sleep and exercise patterns for a user over one or more preceding days.

A strap for a wearable physiological monitor can be adjusted to a desired tension. The strap may include a buckle that retains a length of the strap as the strap is removed from and replaced to the wearable physiological monitor. In this manner, one or more straps may be removed and replaced without requiring readjustment of strap length for a particular user.

A physiological monitor switches between a time domain analysis and a frequency domain analysis for determining a heart rate based on objective indicia of signal quality in an acquired heart rate signal.

Physiological parameters such as respiratory rate and/or heart rate variability can be measured over time for a user and correlated to physiological and/or hormonal cycles such as the menstrual cycle. By determining the phase of such a cycle in this manner, an automatic coach for the user can recommend phase-specific adjustments to activities such as sleep and exercise.

Abstract A model of data quality is derived for physiological monitoring with a wearable device by comparing data from the wearable device to concurrent data acquisition from a ground truth device such as a chest strap or electrocardiography (EKG) heart rate monitor. With this comparative data, a machine learning model or the like may be derived to prospectively evaluate data quality based on the data acquisition context, as determined, for example, by other sensor data and signals from the wearable device.