公开(公告)号：US20220095957A1

公开(公告)日：2022-03-31

申请号：US17033621

申请日：2020-09-25

Applicant: Apple Inc.

Inventor： Di Wu ,  Hui Chen ,  Paige N. Stanley ,  James Ochs

IPC: A61B5/11 ,  A61B5/00 ,  A61B5/024

Abstract: Embodiments are disclosed for estimating caloric expenditure based on center of mass motion and heart rate. In an embodiment, a method comprises: obtaining acceleration and rotation rate of a wearable device worn on a limb of a user; transforming the acceleration and rotation rate into an inertial frame; determining a vertical component of acceleration, rotation rate magnitude and vertical component of rotational acceleration due to limb rotation; determining a work rate (WR) based caloric expenditure based on the vertical component of acceleration, rotation rate magnitude and a correlation coefficient that measures a correlation between the vertical component of acceleration and the vertical component of rotational acceleration; obtaining heart rate (HR) data from a heart rate sensor of the wearable device; determining an HR based caloric expenditure based on the HR data; and fusing, the WR based caloric expenditure with the HR based caloric expenditure to get a fused caloric expenditure.

公开(公告)号：US11638556B2

公开(公告)日：2023-05-02

申请号：US17033634

申请日：2020-09-25

Applicant: Apple Inc.

Inventor： Di Wu ,  James Ochs ,  Paige N. Stanley ,  Karthik Jayaraman Raghuram

IPC: A61B5/00 ,  A61B5/0205 ,  A61B5/11 ,  G16H20/30 ,  G16H40/67 ,  G16H50/30 ,  G16H10/60 ,  A61B5/024 ,  A61B5/145

Abstract: Embodiments are disclosed for estimating caloric expenditure using a heart rate model specific to a motion class. In an embodiment, a method comprises: obtaining acceleration and rotation rate from motion sensors of a wearable device; determining a vertical component of inertial acceleration and a vertical component of rotational acceleration from the acceleration and rotation rate, respectively; determining a magnitude of the rotation rate; determining a correlation between the inertial vertical acceleration component and rotational acceleration; determining a percentage of motion outside a dominant plane of motion; predicting a motion class based on a motion classification model that takes as input the motions, correlation and percentage; determining a likelihood the user is walking; in accordance with determining that the user is likely not walking, configuring a heart rate model based on the predicted motion class; and estimating, using the configured heart rate model, a caloric expenditure of the user.

公开(公告)号：US20220096006A1

公开(公告)日：2022-03-31

申请号：US17033634

申请日：2020-09-25

Applicant: Apple Inc.

Inventor： Di Wu ,  James Ochs ,  Paige N. Stanley ,  Karthik Jayaraman Raghuram

IPC: A61B5/00 ,  A61B5/11 ,  A61B5/0205 ,  G16H20/30 ,  G16H40/67 ,  G16H50/30 ,  G16H10/60

Abstract: Embodiments are disclosed for estimating caloric expenditure using a heart rate model specific to a motion class. In an embodiment, a method comprises: obtaining acceleration and rotation rate from motion sensors of a wearable device; determining a vertical component of inertial acceleration and a vertical component of rotational acceleration from the acceleration and rotation rate, respectively; determining a magnitude of the rotation rate; determining a correlation between the inertial vertical acceleration component and rotational acceleration; determining a percentage of motion outside a dominant plane of motion; predicting a motion class based on a motion classification model that takes as input the motions, correlation and percentage; determining a likelihood the user is walking; in accordance with determining that the user is likely not walking, configuring a heart rate model based on the predicted motion class; and estimating, using the configured heart rate model, a caloric expenditure of the user.

公开(公告)号：US20250103011A1

公开(公告)日：2025-03-27

申请号：US18896745

申请日：2024-09-25

Applicant: Apple Inc.

Inventor： Di Wu ,  Hui Chen ,  James P. Ochs ,  Paige N. Stanley ,  Swaroop Pal ,  Mark G. Petovello ,  Fatemeh Ghafoori ,  Isaac T. Miller

IPC: G04F13/02 ,  G01J1/42

Abstract: Embodiments are disclosed for estimating time outdoors and in daylight based on ambient light, motion, and location sensing. In some embodiments, a method comprises detecting daylight based on an ambient light measurement, an estimated sun elevation angle and at least one confidence threshold; determining a motion or activity state of a user based on motion sensor data; determining an indoor or outdoor class based on the motion sensor data and the ambient light detections; determining user exposure time to daylight between, before or after ambient light detections, based on the motion or activity state, and the determined indoor or outdoor class; and storing or displaying the daylight time.