Authors:
M. Hernandez Silveira
;
S.-S. Ang
;
T. Mehta
;
B. Wang
and
A. Burdett
Affiliation:
Toumaz UK Ltd, United Kingdom
Keyword(s):
Activity energy expenditure, Accelerometer, Heart rate, Calibration.
Related
Ontology
Subjects/Areas/Topics:
Biomedical Engineering
;
Biomedical Equipment
;
Biomedical Instruments and Devices
;
Biomedical Sensors
;
Embedded Signal Processing
;
Low-Power Design
Abstract:
It is well known that sedentary life style lead to conditions such as obesity and diabetes. In recent years, there has been increasing interest in devices capable of measuring activity energy expenditure (AEE) and physical activity intensity (PAI) without disrupting the activities of daily living. In this paper we introduce a portable and light-weight device based on our SensiumTM technology. Unlike existing commercially available devices, the latter can measure both AEE and PAI in a real-time basis and convey the resultant calculations wirelessly to a remote PC and/or sever. Such calculations are carried out by means of a mathematical model, which combines heart rate and accelerometer information to produce PAI and AEE estimations. The model was calibrated against a reference indirect calorimetry system. In particular, simulated annealing was used to adjust the model parameters so as to allow a closer match between the predicted and reference values. The resulting model was tested u
sing a separate dataset with reference to indirect calorimetry. The 95% prediction interval and the Spearman’s correlation coefficient (r) for PAI were found to be [-0.1307, 0.171] kJ/kg/min and 0.903 (p<0.001) respectively. In addition, the results revealed that there is agreement between SensiumTM and a similar reference (validated) device.
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