using fitness devices and global positioning system (gps) technology in measuring energy expenditure...
TRANSCRIPT
Using Fitness Devices and Global Positioning System (GPS)
Technology in Measuring Energy Expenditure and Distance Walked
Over Flat and Incline Surfaces
Rebecca ReedArizona Space Grant Consortium
The University of Arizona April 17, 2010
A special thanks to:
• Nobuko Kay Hongu, PhD (Mentor): Assistant Professor and Extension Specialist, Department of Nutritional Sciences
• Scott Going, PhD: Professor, Department Nutritional Sciences
• Barron Orr, PhD: Arid Lands Studies (UA); Geospatial Extension Specialist
• Martha Mosqueda (Advisor): Department of Nutritional Sciences
Overview
1. Relevance and Purpose of study
2. Methodology
-Technology
3. Results
4. Analysis & Conclusions
Relevance and Purpose • Accurate measure of Physical Activity (PA)
– Research studies with PA as outcome or intervention
– Losing weight, maintaining healthy weight
Purpose: Evaluate the accuracy of five fitness devices in estimating distance and energy expenditure (EE), as compared to the criterion and standard values, while traversing flat and incline surfaces
Technology
Garmin Forerunner 305 (GPS watch)
Omron HJ-720
pedometer
RT3 accelerometer
Actigraph GT1M
accelerometer
Omron HJ-303 pedometer
ParticipantParticipantParticipantParticipantFlat Surface
3x TrialsData
Averages
Inclined Surface
5 km/hr3 km/hr3 km/hr 5 km/hr
3x Trials
Distance
4 Devices5 Devices
EE
Statistical Analysis of Results
• Calculated mean difference scores (Device A-Device B) – Example (RT3 EE- HJ720 EE) = 23.95 kcal
• Used ANCOVAs to determine significant differences in mean difference scores
Results and Significance
3 km/hr 5 km/hr
3 km/hr 5 km/hr
EE Mean Measurements
Stairs
Track
***
****
*
***
****
*Significantly different from RT3; P <0.05
*
Results and Significance
Distance Mean Measurements
3 km/hr 5 km/hr
3 km/hr 5 km/hr
Stairs
** **
*
*Significantly different from standard; P <0.05
Conclusions
• It matters what fitness device you use
• Fitness devices are valuable tools
• Increase PA in children and youth
Acknowledgements
Catalina Foothills High School
Arizona Coopertive Extensions
Office of Arid Land Studies
Nutritional Sciences Department
Physiology Department