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Validated Caloric Expenditure Estimation with a Body-Worn Sensor: Accuracy and Methods

This study explores a method for estimating caloric expenditure using a single body-worn sensor. With obesity affecting 30% of US adults and healthcare costs exceeding $100 billion, accurate caloric tracking is crucial. We built a training set from laboratory and field data collection, measuring oxygen consumption (V̇O2) to establish ground truth for caloric expenditure. Participants engaged in various activities, and our findings were validated using techniques like barometric pressure and GPS. This research provides insights into effective caloric tracking methods in everyday settings.

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Validated Caloric Expenditure Estimation with a Body-Worn Sensor: Accuracy and Methods

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  1. Validated Caloric Expenditure Estimation using a Single Body-Worn Sensor

  2. outline • Motivation • Abstract • Introduction • Conclusion

  3. Motivation • In 2007, approximately 30% of US adults were obese • Related health care costs exceeding 100 billion dollars

  4. Abstract • Build training set • Testing • Experient • Result

  5. Introduction • Experiment setup • Compute the caloric expenditure • V̇O2 will provide us with the ground truth caloric expenditure • What is V̇O2 ? • V̇O2 is obtained using measures of oxygen consumption. • “耗氧率”

  6. Introduction • subject

  7. Introduction • What kind of training set? • Laboratory Data Collection • Field Data Collection

  8. Introduction • How to build training set ? • Laboratory Data Collection • Participants walked and ran on a treadmill for the lab sessions • Subjects performed the walking and running stages in a predetermined order with a random starting stage to help eliminate transitional effects in the data

  9. Introduction • How to build training set ? • Field Data Collection • day-to-day activities, with each session lasting about 15 minute • Start data collection sitting down for several minutes on the 5th floor • Stand and walk to the elevator • Go down and walk outside • Walk down a small flight of ~4 stairs and then walk around an inclined area and up a set of steps • Pick up a heavy object (~20lb) and walk around with it • Place the object down and sweep the ground for approximately a minute • Walk back inside to the elevator and up to the 5th floor • Walk back to the setup area and sit for several minutes

  10. Introduction

  11. Introduction • V̇O2=R+H+V • Where Ris resting Metabolic Rate • H is Horizontal component • V is Vertical component

  12. Introduction • Step Counting

  13. Introduction

  14. Introduction • Others techniques • Barometric Pressure. • Barometric Pressure + GPS. • GPS Only. • GPS + GIS Sources. Several GIS (Geographic Information Systems)

  15. LIDAR (air-based laser range finder scans) which provide high resolution elevation profiles accurate to within 30cm.

  16. Ten folded cross validation • leave-one-out

  17. Conclusion

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