| Type of physical activity |
Self-report diary or checklist; observe in lab; video; short distance timed walk or distance walked in 2-6 min. |
Activity pattern-recognition algorithms; walk, cycle, leg exercises identifiable by sensor data processing |
| Quantity Frequency/duration |
Observation; inertial movement/step counts if accelerations high enough |
Directly measure wave forms of individual components and whole actions |
| Quality |
Laboratory motion analysis or pressure mat system |
Compare each leg during step cycle in context of environs |
| Location of activity |
Self report; lab |
Anywhere; global positioning & ambient context sensing for site identification |
| Reliability |
Inter-rater; test-retest |
Ground truth measurement v. sensor-based algorithm |
| Validity |
Content/construct for each scale |
Face validity; responsiveness |
| Statistical testing |
Ordinal scales of physical functioning |
Interval / ratio scale data |
| Data entry |
Computer |
Smartphone, tablet |
| Human factors |
Train examiners in test administration |
Train participants in a culture of technology |
| Regulation |
Local Institutional Review Board and HIPAA |
Local IRB & HIPAA; possibly Food and Drug Administration |
