Apple Inc.

Dan Marvin Trietsch

Ronald Keryuan Huang

Hung A Pham

Karthik Jayaraman Raghuram

Alexander Singh Alvarado

Umamahesh Srinivas

Xing Tan

Adeeti V Ullal

Gunes Dervisoglu

Craig H Mermel

Richard Channing Moore, Iii

In one aspect, the present disclosure relates to a method including obtaining, by a heart rate sensor of a fitness tracking device, a heart rate measurement of a user of the fitness tracking device; obtaining, by at least one motion sensor, motion data of the user; analyzing, by the fitness tracking device, the motion data of the user to estimate a step rate of the user; estimating, by the fitness tracking device, a load associated with a physical activity of the user by comparing the heart rate measurement with the step rate of the user; and estimating, by the fitness tracking device, an energy expenditure rate of the user using the load and at least one of the heart rate measurement and the step rate.

Latent load calibration for calorimetry using sensor fusion

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Cupertino, CA, United States of America

Dan Marvin Trietsch