adaptability aging 4 3-axis force sensor 3 ANOVA analysis 3 Achilles tendon 3 ActiGraph 3 Alzheimer's disease 3 ESOQ-2 3 Ecoflex 3 IMU 3 IMU sensors 3 IoT 3 Kinect 3 MET 3 MR damper 3 Microsoft Kinect 3 PDMS 3 Parkinson's Diseases 3 Parkinson's disease 3 Parkinson's disease (PD) 3 Pedometer 3 RGB-Depth 3 RGB-depth 3 Step-detection 3 TUG 3 UPDRS 3 UPDRS tasks 3 VO2 3 VO2net 3 abduction 3