Martin Luther King Jr. Day
Our office will be closed Monday, Jan 18th in observance of Martin Luther King Jr. Day. We will reopen at regular business hours on Tuesday, Jan 19th.
Research Study Abstract
- Home /
- Research Database /
- Research Study Abstract
Assessment of Physical Activity and Energy Expenditure by GPS Combined With Accelerometry in Real-Life Conditions
- Published on Augus 6, 2013
Background:
Physical activity (PA) and related energy
expenditure (EE) is often assessed by means of a single
technique. Because of inherent limitations, single techniques
may not allow for an accurate assessment both PA and related
EE. The aim of this study was to develop a model to accurately
assess common PA types and durations and thus EE in
free-living conditions, combining data from global positioning
system (GPS) and 2 accelerometers.
Methods:
Forty-one
volunteers participated in the study. First, a model was
developed and adjusted to measured EE with a first group of
subjects (Protocol I, n = 12) who performed 6 structured and
supervised PA. Then, the model was validated over 2
experimental phases with 2 groups (n = 12 and n = 17)
performing scheduled (Protocol I) and spontaneous common
activities in real-life condition (Protocol II). Predicted EE
was compared with actual EE as measured by portable indirect
calorimetry.
Results:
In protocol I, performed PA types could
be recognized with little error. The duration of each PA type
could be predicted with an accuracy below 1 minute. Measured
and predicted EE were strongly associated (r = .97, P < .001).
Conclusion:
Combining GPS and 2 accelerometers allows for an
accurate assessment of PA and EE in free-living situations.