Physical activity profiling: Activity-specific step counting and energy expenditure models using 3D wrist acceleration

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Delgado-Gonzalo, Ricard
Celka, Patrick
Renevey, Philippe
Dasen, Stephan
Sola, Josep
Bertschi, Mattia
Lemay, Mathieu
In this paper, we present the evaluation of a new physical activity profiling system embedded in a wrist-located device. We propose a step counting and an energy expenditure (EE) method, and evaluate their accuracy against gold standard references. To this end, we used an actimetry sensor on the waist and an indirect calorimetry monitoring device on a population of 13 subjects to obtain step count and metabolic equivalent task (kcal/kg/h) referenced values. The subjects followed a protocol that spanned a given set of activities (lying, standing, walking, running) at a wide range of intensities. The performance of the EE model was characterized by an RMSE of 1.22±0.34kcal/min, and step-count model at regular walking/running speeds by 0.71±0.06step/10sec.
Publication Reference
2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), Milan (Italy), pp. 8091-8094