iPhone Sensors in Tracking Outcome Variables of the 30-Second Chair Stand Test and Stair Climb Test to Evaluate Disability: Cross-Sectional Pilot Study

Gautam Adusumilli   ^{1 *} , BA ;   Solomon Eben Joseph   ^{1 *} ;   Michael A Samaan   ¹ , PhD ;   Brooke Schultz   ² , MS ;   Tijana Popovic   ¹ , MS ;   Richard B Souza   ^{1, 3} , PT, PhD ;   Sharmila Majumdar   ¹ , PhD

¹ Musculoskeletal Quantitative Imaging Research Group, Department of Radiology and Imaging, University of California San Francisco, San Francisco, CA, United States

² Human Performance Center, Department of Orthopaedic Surgery, University of California San Francisco, San Francisco, CA, United States

³ Human Performance Center, Department of Physical Therapy and Rehabilitation Science, University of California San Francisco, San Francisco, CA, United States

*these authors contributed equally