Energy balance
Triaxial accelerometry provides significantly higher accuracy in predicting total energy expenditure (TEE) and activity-related energy expenditure (AEE) in free-living conditions compared to uniaxial accelerometry.
If you are tracking energy expenditure or physical activity levels in a real-world setting, use a triaxial accelerometer (measuring movement in all three planes: vertical, mediolateral, and anteroposterior) rather than a simple pedometer or uniaxial monitor. The additional axes capture non-walking movements (like arm swings or twisting) that uniaxial devices miss, leading to a significantly more accurate estimate of your total energy expenditure.
The increase in the explained variation using three axes instead of one axis (vertical) was 5% (p < 0.05). ... To measure daily life activities, the use of triaxial accelerometry seems beneficial to uniaxial.
Why this rating
High-quality validation against the gold standard (Doubly Labeled Water) in a controlled free-living setting, though sample size is moderate (n=29).
Source
Measuring Free‐Living Energy Expenditure and Physical Activity with Triaxial Accelerometry
Guy Plasqui et al. · Obesity Research · 2005
DOI 10.1038/oby.2005.165
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