A recent study quantified free-living (community) mobility using subjective questionnaires.1 The authors found no useful information from their free-living mobility data. This can be attributed to the limited methodology, more likely overcome with standardised objective approaches.
Are inertial sensor-based (accelerometer/gyroscope) wearables the viable solution? They promise the next step in monitoring: unobtrusive, objective, continuous and pervasive. However, lack of clinically appropriate (sensitive/specific) algorithms has hindered advances. Often, attempts to instrument mobility in the context of physical activity (energy expenditure) or ambulation (‘macro gait’: walking bout detection or step count) have used invalid devices, but nevertheless used to inform pathological diagnosis. Yet, robust free-living validation studies are severely lacking. Moreover, we have yet to witness the integration of these devices into existing information technology infrastructures. True value may be found by standardising algorithms, establishing gold standard approaches and integration into wider technologies.
Additionally, instrumentation of mobility tasks are...
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