Wearable Accelerometer and Indirect Calorimetry

The ActiGraph GT3X+ monitors were mounted on participants’ right wrists. These lightweight accelerometers record accelerations in units of gravity (1 g) in perpendicular, anterior-posterior, and medio-lateral axes. They were configured to collect data at 100 Hz sampling rate. Energy expenditures was measured in parallel using a portable indirect calorimetry system, Cosmed K4b2 [14 (link)]. Respiratory gas exchange data were collected breath-by-breath through a fitted mask. Data were converted to MET values defined as the oxygen uptake (VO₂ = ml/min.kg) during steady state rate expressed as a function of 3.5 ml/min.kg.

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Kheirkhahan M., Chakraborty A., Wanigatunga A.A., Corbett D.B., Manini T.M, & Ranka S. (2018). Wrist accelerometer shape feature derivation methods for assessing activities of daily living. BMC Medical Informatics and Decision Making, 18(Suppl 4), 124.

Publication 2018

ActiGraph GT3X+ monitors

Accelerations Actigraph Axes Energy expenditures Gravity Indirect calorimetry Oxygen Respiratory Wrists

Corresponding Organization : University of Florida

Other organizations : Johns Hopkins University

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Variable analysis

independent variables

Body acceleration in perpendicular, anterior-posterior, and medio-lateral axes

dependent variables

Energy expenditure measured using a portable indirect calorimetry system (Cosmed K4b2)

control variables

Participants' right wrist for mounting the ActiGraph GT3X+ monitors
Sampling rate of 100 Hz for the ActiGraph GT3X+ monitors
Respiratory gas exchange data collected breath-by-breath through a fitted mask

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