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Using Fitness Devices and Global Positioning System (GPS) Technology in Measuring Energy Expenditure and Distance Walked Over Flat and Incline Surfaces. Rebecca Reed Arizona Space Grant Consortium The University of Arizona April 17, 2010. A special thanks to:. - PowerPoint PPT Presentation
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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
Methodology
N= 21 (10 female, 11 male) Gender, height, weight, age recorded
Instrumentation
ParticipantParticipantFlat 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 SignificanceDistance 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
Thank you!
How does GPS work ?
• 24 satellites orbiting Earth – Transmit electromagnetic waves to GPS
receiver • Can calculate distance between GPS
receiver and satellites– Receiver location can be measured
• Use trilateration to determine position, speed, elevation