This is a prospective observational study looking at gait-cadence in older adults who are scheduled to have major abdominal surgery at the University of Chicago. The objective of the study is to evaluate whether gait-cadence, as measured from a patient's mobile device at-home, can provide an accurate assessment of a patient's functional status prior to major abdominal surgery and identify patients at risk of poor functional outcomes.
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Accuracy of gait-cadence measured from at-home and in-clinic walk tests as measured by ActivPAL accelerometers.
Timeframe: Baseline (Before surgery)