US 12,465,813 B2
Biomechanical triggers for improved responsiveness in grade estimation
Asif Khalak, Belmont, CA (US); Adeeti V. Ullal, Emerald Hills, CA (US); and Gabriel A. Blanco, San Francisco, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 23, 2022, as Appl. No. 17/952,174.
Claims priority of provisional application 63/349,087, filed on Jun. 4, 2022.
Prior Publication US 2023/0390605 A1, Dec. 7, 2023
Int. Cl. A63B 24/00 (2006.01); G01C 9/06 (2006.01); G01C 22/00 (2006.01)
CPC A63B 24/0062 (2013.01) [G01C 9/06 (2013.01); G01C 22/006 (2013.01); A63B 2220/18 (2013.01); A63B 2220/836 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining, with at least one processor of a wearable device worn by a user, cadence data, speed data and elevation data;
determining, with the at least one processor, a grade of a surface on which the user is traveling based on a ratio of a change in elevation based on the elevation data and a change in the speed data;
determining, with the at least one processor, that the grade satisfies a first condition indicative of a horizontal speed compensation by the user at a grade onset;
determining, with the at least one processor, that the grade satisfies a second condition indicative of a rapid elevation increase or decrease at the grade onset;
confirming, with the at least one processor, that the grade is a valid estimate based on either the first condition or the second condition being satisfied; and
determining, with the at least one processor, a fitness metric based on the valid grade estimate.